diff --git a/beacon-chain/blockchain/metrics.go b/beacon-chain/blockchain/metrics.go
index c712b574d..aaa322d91 100644
--- a/beacon-chain/blockchain/metrics.go
+++ b/beacon-chain/blockchain/metrics.go
@@ -2,6 +2,7 @@ package blockchain
 
 import (
 	"context"
+	"strconv"
 
 	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus"
@@ -353,10 +354,26 @@ func reportEpochMetrics(ctx context.Context, postState, headState state.BeaconSt
 		return errors.Errorf("invalid state type provided: %T", headState.ToProtoUnsafe())
 	}
 
-	prevEpochActiveBalances.Set(float64(b.ActivePrevEpoch))
-	prevEpochSourceBalances.Set(float64(b.PrevEpochAttested))
-	prevEpochTargetBalances.Set(float64(b.PrevEpochTargetAttested))
-	prevEpochHeadBalances.Set(float64(b.PrevEpochHeadAttested))
+	parsedActivePrevEpoch, err := strconv.ParseFloat(b.ActivePrevEpoch.String(), 64)
+	if err != nil {
+		parsedActivePrevEpoch = float64(0)
+	}
+	parsedPrevEpochAttested, err := strconv.ParseFloat(b.PrevEpochAttested.String(), 64)
+	if err != nil {
+		parsedPrevEpochAttested = float64(0)
+	}
+	parsedPrevEpochTargetAttested, err := strconv.ParseFloat(b.PrevEpochTargetAttested.String(), 64)
+	if err != nil {
+		parsedPrevEpochTargetAttested = float64(0)
+	}
+	parsedPrevEpochHeadAttested, err := strconv.ParseFloat(b.PrevEpochHeadAttested.String(), 64)
+	if err != nil {
+		parsedPrevEpochHeadAttested = float64(0)
+	}
+	prevEpochActiveBalances.Set(parsedActivePrevEpoch)
+	prevEpochSourceBalances.Set(parsedPrevEpochAttested)
+	prevEpochTargetBalances.Set(parsedPrevEpochTargetAttested)
+	prevEpochHeadBalances.Set(parsedPrevEpochHeadAttested)
 
 	refMap := postState.FieldReferencesCount()
 	for name, val := range refMap {
diff --git a/beacon-chain/blockchain/testing/mock.go b/beacon-chain/blockchain/testing/mock.go
index 27083f671..9a03fa142 100644
--- a/beacon-chain/blockchain/testing/mock.go
+++ b/beacon-chain/blockchain/testing/mock.go
@@ -5,6 +5,7 @@ package testing
 import (
 	"bytes"
 	"context"
+	"math/big"
 	"sync"
 	"time"
 
@@ -370,7 +371,7 @@ func (s *ChainService) CurrentSlot() primitives.Slot {
 }
 
 // Participation mocks the same method in the chain service.
-func (s *ChainService) Participation(_ uint64) *precompute.Balance {
+func (s *ChainService) Participation(_ *big.Int) *precompute.Balance {
 	return s.Balance
 }
 
diff --git a/beacon-chain/cache/active_balance.go b/beacon-chain/cache/active_balance.go
index f79f5e896..93ed1fc69 100644
--- a/beacon-chain/cache/active_balance.go
+++ b/beacon-chain/cache/active_balance.go
@@ -4,6 +4,7 @@ package cache
 
 import (
 	"encoding/binary"
+	"math/big"
 	"sync"
 
 	lru "github.com/hashicorp/golang-lru"
@@ -55,7 +56,7 @@ func (c *BalanceCache) Clear() {
 }
 
 // AddTotalEffectiveBalance adds a new total effective balance entry for current balance for state `st` into the cache.
-func (c *BalanceCache) AddTotalEffectiveBalance(st state.ReadOnlyBeaconState, balance uint64) error {
+func (c *BalanceCache) AddTotalEffectiveBalance(st state.ReadOnlyBeaconState, balance *big.Int) error {
 	key, err := balanceCacheKey(st)
 	if err != nil {
 		return err
@@ -69,10 +70,11 @@ func (c *BalanceCache) AddTotalEffectiveBalance(st state.ReadOnlyBeaconState, ba
 }
 
 // Get returns the current epoch's effective balance for state `st` in cache.
-func (c *BalanceCache) Get(st state.ReadOnlyBeaconState) (uint64, error) {
+func (c *BalanceCache) Get(st state.ReadOnlyBeaconState) (*big.Int, error) {
 	key, err := balanceCacheKey(st)
+	zero := big.NewInt(0)
 	if err != nil {
-		return 0, err
+		return zero, err
 	}
 
 	c.lock.RLock()
@@ -81,10 +83,10 @@ func (c *BalanceCache) Get(st state.ReadOnlyBeaconState) (uint64, error) {
 	value, exists := c.cache.Get(key)
 	if !exists {
 		balanceCacheMiss.Inc()
-		return 0, ErrNotFound
+		return zero, ErrNotFound
 	}
 	balanceCacheHit.Inc()
-	return value.(uint64), nil
+	return value.(*big.Int), nil
 }
 
 // Given input state `st`, balance key is constructed as:
diff --git a/beacon-chain/cache/active_balance_test.go b/beacon-chain/cache/active_balance_test.go
index b821a6d15..39658888d 100644
--- a/beacon-chain/cache/active_balance_test.go
+++ b/beacon-chain/cache/active_balance_test.go
@@ -5,6 +5,7 @@ package cache
 import (
 	"encoding/binary"
 	"math"
+	"math/big"
 	"testing"
 
 	state_native "github.com/prysmaticlabs/prysm/v5/beacon-chain/state/state-native"
@@ -31,7 +32,7 @@ func TestBalanceCache_AddGetBalance(t *testing.T) {
 	_, err = cache.Get(st)
 	require.ErrorContains(t, ErrNotFound.Error(), err)
 
-	b := uint64(100)
+	b := big.NewInt(100)
 	require.NoError(t, cache.AddTotalEffectiveBalance(st, b))
 	cachedB, err := cache.Get(st)
 	require.NoError(t, err)
@@ -41,7 +42,7 @@ func TestBalanceCache_AddGetBalance(t *testing.T) {
 	_, err = cache.Get(st)
 	require.ErrorContains(t, ErrNotFound.Error(), err)
 
-	b = uint64(200)
+	b = big.NewInt(200)
 	require.NoError(t, cache.AddTotalEffectiveBalance(st, b))
 	cachedB, err = cache.Get(st)
 	require.NoError(t, err)
@@ -51,7 +52,7 @@ func TestBalanceCache_AddGetBalance(t *testing.T) {
 	_, err = cache.Get(st)
 	require.ErrorContains(t, ErrNotFound.Error(), err)
 
-	b = uint64(300)
+	b = big.NewInt(300)
 	require.NoError(t, cache.AddTotalEffectiveBalance(st, b))
 	cachedB, err = cache.Get(st)
 	require.NoError(t, err)
diff --git a/beacon-chain/core/altair/attestation.go b/beacon-chain/core/altair/attestation.go
index f54a6d043..ae339e583 100644
--- a/beacon-chain/core/altair/attestation.go
+++ b/beacon-chain/core/altair/attestation.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	"fmt"
+	"math/big"
 
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/blocks"
@@ -49,7 +50,7 @@ func ProcessAttestationNoVerifySignature(
 	ctx context.Context,
 	beaconState state.BeaconState,
 	att *ethpb.Attestation,
-	totalBalance uint64,
+	totalBalance *big.Int,
 ) (state.BeaconState, error) {
 	ctx, span := trace.StartSpan(ctx, "altair.ProcessAttestationNoVerifySignature")
 	defer span.End()
@@ -105,7 +106,7 @@ func SetParticipationAndRewardProposer(
 	beaconState state.BeaconState,
 	targetEpoch primitives.Epoch,
 	indices []uint64,
-	participatedFlags map[uint8]bool, totalBalance uint64) (state.BeaconState, error) {
+	participatedFlags map[uint8]bool, totalBalance *big.Int) (state.BeaconState, error) {
 	var proposerRewardNumerator uint64
 	currentEpoch := time.CurrentEpoch(beaconState)
 	var stateErr error
@@ -165,7 +166,7 @@ func AddValidatorFlag(flag, flagPosition uint8) (uint8, error) {
 //	        if flag_index in participation_flag_indices and not has_flag(epoch_participation[index], flag_index):
 //	            epoch_participation[index] = add_flag(epoch_participation[index], flag_index)
 //	            proposer_reward_numerator += get_base_reward(state, index) * weight
-func EpochParticipation(beaconState state.BeaconState, indices []uint64, epochParticipation []byte, participatedFlags map[uint8]bool, totalBalance uint64) (uint64, []byte, error) {
+func EpochParticipation(beaconState state.BeaconState, indices []uint64, epochParticipation []byte, participatedFlags map[uint8]bool, totalBalance *big.Int) (uint64, []byte, error) {
 	cfg := params.BeaconConfig()
 	sourceFlagIndex := cfg.TimelySourceFlagIndex
 	targetFlagIndex := cfg.TimelyTargetFlagIndex
diff --git a/beacon-chain/core/altair/attestation_test.go b/beacon-chain/core/altair/attestation_test.go
index d548c5c4e..0fe721f6c 100644
--- a/beacon-chain/core/altair/attestation_test.go
+++ b/beacon-chain/core/altair/attestation_test.go
@@ -512,9 +512,10 @@ func TestSetParticipationAndRewardProposer(t *testing.T) {
 
 			i, err := helpers.BeaconProposerIndex(context.Background(), st)
 			require.NoError(t, err)
-			b, err = beaconState.BalanceAtIndex(i)
+			var bal uint64
+			bal, err = beaconState.BalanceAtIndex(i)
 			require.NoError(t, err)
-			require.Equal(t, test.wantedBalance, b)
+			require.Equal(t, test.wantedBalance, bal)
 
 			if test.epoch == currentEpoch {
 				p, err := beaconState.CurrentEpochParticipation()
diff --git a/beacon-chain/core/altair/block.go b/beacon-chain/core/altair/block.go
index a8d9a51e0..8fae32f51 100644
--- a/beacon-chain/core/altair/block.go
+++ b/beacon-chain/core/altair/block.go
@@ -2,6 +2,7 @@ package altair
 
 import (
 	"context"
+	"math/big"
 
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/helpers"
@@ -148,13 +149,13 @@ func VerifySyncCommitteeSig(s state.BeaconState, syncKeys []bls.PublicKey, syncS
 }
 
 // SyncRewards returns the proposer reward and the sync participant reward given the total active balance in state.
-func SyncRewards(activeBalance uint64) (proposerReward, participantReward uint64, err error) {
+func SyncRewards(activeBalance *big.Int) (proposerReward, participantReward uint64, err error) {
 	cfg := params.BeaconConfig()
-	totalActiveIncrements := activeBalance / cfg.EffectiveBalanceIncrement
 	baseRewardPerInc, err := BaseRewardPerIncrement(activeBalance)
 	if err != nil {
 		return 0, 0, err
 	}
+	totalActiveIncrements := new(big.Int).Div(activeBalance, new(big.Int).SetUint64(cfg.EffectiveBalanceIncrement)).Uint64()
 	totalBaseRewards := baseRewardPerInc * totalActiveIncrements
 	maxParticipantRewards := totalBaseRewards * cfg.SyncRewardWeight / cfg.WeightDenominator / uint64(cfg.SlotsPerEpoch)
 	participantReward = maxParticipantRewards / cfg.SyncCommitteeSize
diff --git a/beacon-chain/core/altair/block_test.go b/beacon-chain/core/altair/block_test.go
index 5b6fb0337..50058abdb 100644
--- a/beacon-chain/core/altair/block_test.go
+++ b/beacon-chain/core/altair/block_test.go
@@ -3,6 +3,7 @@ package altair_test
 import (
 	"context"
 	"math"
+	"math/big"
 	"testing"
 
 	"github.com/prysmaticlabs/go-bitfield"
@@ -290,49 +291,49 @@ func Test_VerifySyncCommitteeSig(t *testing.T) {
 func Test_SyncRewards(t *testing.T) {
 	tests := []struct {
 		name                  string
-		activeBalance         uint64
+		activeBalance         *big.Int
 		wantProposerReward    uint64
 		wantParticipantReward uint64
 		errString             string
 	}{
 		{
 			name:                  "active balance is 0",
-			activeBalance:         0,
+			activeBalance:         big.NewInt(0),
 			wantProposerReward:    0,
 			wantParticipantReward: 0,
 			errString:             "active balance can't be 0",
 		},
 		{
 			name:                  "active balance is 1",
-			activeBalance:         1,
+			activeBalance:         big.NewInt(1),
 			wantProposerReward:    0,
 			wantParticipantReward: 0,
 			errString:             "",
 		},
 		{
 			name:                  "active balance is 1eth",
-			activeBalance:         params.BeaconConfig().EffectiveBalanceIncrement,
+			activeBalance:         new(big.Int).SetUint64(params.BeaconConfig().EffectiveBalanceIncrement),
 			wantProposerReward:    0,
 			wantParticipantReward: 3,
 			errString:             "",
 		},
 		{
 			name:                  "active balance is 32eth",
-			activeBalance:         params.BeaconConfig().MaxEffectiveBalance,
+			activeBalance:         new(big.Int).SetUint64(params.BeaconConfig().MaxEffectiveBalance),
 			wantProposerReward:    3,
 			wantParticipantReward: 21,
 			errString:             "",
 		},
 		{
 			name:                  "active balance is 32eth * 1m validators",
-			activeBalance:         params.BeaconConfig().MaxEffectiveBalance * 1e9,
+			activeBalance:         new(big.Int).SetUint64(params.BeaconConfig().MaxEffectiveBalance * 1e9),
 			wantProposerReward:    62780,
 			wantParticipantReward: 439463,
 			errString:             "",
 		},
 		{
 			name:                  "active balance is max uint64",
-			activeBalance:         math.MaxUint64,
+			activeBalance:         new(big.Int).SetUint64(math.MaxUint64),
 			wantProposerReward:    70368,
 			wantParticipantReward: 492581,
 			errString:             "",
diff --git a/beacon-chain/core/altair/epoch_precompute.go b/beacon-chain/core/altair/epoch_precompute.go
index dbe519830..9aff4f2f2 100644
--- a/beacon-chain/core/altair/epoch_precompute.go
+++ b/beacon-chain/core/altair/epoch_precompute.go
@@ -2,6 +2,7 @@ package altair
 
 import (
 	"context"
+	"math/big"
 
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/epoch/precompute"
@@ -28,7 +29,7 @@ func InitializePrecomputeValidators(ctx context.Context, beaconState state.Beaco
 	_, span := trace.StartSpan(ctx, "altair.InitializePrecomputeValidators")
 	defer span.End()
 	vals := make([]*precompute.Validator, beaconState.NumValidators())
-	bal := &precompute.Balance{}
+	bal := precompute.NewBalance()
 	prevEpoch := time.PrevEpoch(beaconState)
 	currentEpoch := time.CurrentEpoch(beaconState)
 	inactivityScores, err := beaconState.InactivityScores()
@@ -43,6 +44,7 @@ func InitializePrecomputeValidators(ctx context.Context, beaconState state.Beaco
 	}
 	if err := beaconState.ReadFromEveryValidator(func(idx int, val state.ReadOnlyValidator) error {
 		// Set validator's balance, inactivity score and slashed/withdrawable status.
+		effectiveBalance := new(big.Int).SetUint64(val.EffectiveBalance())
 		v := &precompute.Validator{
 			CurrentEpochEffectiveBalance: val.EffectiveBalance(),
 			InactivityScore:              inactivityScores[idx],
@@ -52,18 +54,12 @@ func InitializePrecomputeValidators(ctx context.Context, beaconState state.Beaco
 		// Set validator's active status for current epoch.
 		if helpers.IsActiveValidatorUsingTrie(val, currentEpoch) {
 			v.IsActiveCurrentEpoch = true
-			bal.ActiveCurrentEpoch, err = math.Add64(bal.ActiveCurrentEpoch, val.EffectiveBalance())
-			if err != nil {
-				return err
-			}
+			bal.ActiveCurrentEpoch.Add(bal.ActiveCurrentEpoch, effectiveBalance)
 		}
 		// Set validator's active status for previous epoch.
 		if helpers.IsActiveValidatorUsingTrie(val, prevEpoch) {
 			v.IsActivePrevEpoch = true
-			bal.ActivePrevEpoch, err = math.Add64(bal.ActivePrevEpoch, val.EffectiveBalance())
-			if err != nil {
-				return err
-			}
+			bal.ActivePrevEpoch.Add(bal.ActivePrevEpoch, effectiveBalance)
 		}
 		vals[idx] = v
 		return nil
@@ -274,7 +270,8 @@ func AttestationsDelta(beaconState state.BeaconState, bal *precompute.Balance, v
 	finalizedEpoch := beaconState.FinalizedCheckpointEpoch()
 	increment := cfg.EffectiveBalanceIncrement
 	factor := cfg.BaseRewardFactor
-	baseRewardMultiplier := increment * factor / math.CachedSquareRoot(bal.ActiveCurrentEpoch)
+	activeCurrentEpochSqrt := new(big.Int).Sqrt(bal.ActiveCurrentEpoch).Uint64()
+	baseRewardMultiplier := increment * factor / activeCurrentEpochSqrt
 	leak := helpers.IsInInactivityLeak(prevEpoch, finalizedEpoch)
 
 	// Modified in Altair and Bellatrix.
@@ -302,15 +299,15 @@ func attestationDelta(
 	inactivityLeak bool) (*AttDelta, error) {
 	eligible := val.IsActivePrevEpoch || (val.IsSlashed && !val.IsWithdrawableCurrentEpoch)
 	// Per spec `ActiveCurrentEpoch` can't be 0 to process attestation delta.
-	if !eligible || bal.ActiveCurrentEpoch == 0 {
+	if !eligible || bal.ActiveCurrentEpoch.Cmp(big.NewInt(0)) == 0 {
 		return &AttDelta{}, nil
 	}
 
 	cfg := params.BeaconConfig()
-	increment := cfg.EffectiveBalanceIncrement
+	increment := new(big.Int).SetUint64(cfg.EffectiveBalanceIncrement)
 	effectiveBalance := val.CurrentEpochEffectiveBalance
-	baseReward := (effectiveBalance / increment) * baseRewardMultiplier
-	activeIncrement := bal.ActiveCurrentEpoch / increment
+	baseReward := (effectiveBalance / cfg.EffectiveBalanceIncrement) * baseRewardMultiplier
+	activeIncrement := new(big.Int).Div(bal.ActiveCurrentEpoch, increment).Uint64()
 
 	weightDenominator := cfg.WeightDenominator
 	srcWeight := cfg.TimelySourceWeight
@@ -320,7 +317,7 @@ func attestationDelta(
 	// Process source reward / penalty
 	if val.IsPrevEpochSourceAttester && !val.IsSlashed {
 		if !inactivityLeak {
-			n := baseReward * srcWeight * (bal.PrevEpochAttested / increment)
+			n := baseReward * srcWeight * (new(big.Int).Div(bal.PrevEpochAttested, increment)).Uint64()
 			attDelta.SourceReward += n / (activeIncrement * weightDenominator)
 		}
 	} else {
@@ -330,7 +327,7 @@ func attestationDelta(
 	// Process target reward / penalty
 	if val.IsPrevEpochTargetAttester && !val.IsSlashed {
 		if !inactivityLeak {
-			n := baseReward * tgtWeight * (bal.PrevEpochTargetAttested / increment)
+			n := baseReward * tgtWeight * (new(big.Int).Div(bal.PrevEpochTargetAttested, increment)).Uint64()
 			attDelta.TargetReward += n / (activeIncrement * weightDenominator)
 		}
 	} else {
@@ -340,7 +337,7 @@ func attestationDelta(
 	// Process head reward / penalty
 	if val.IsPrevEpochHeadAttester && !val.IsSlashed {
 		if !inactivityLeak {
-			n := baseReward * headWeight * (bal.PrevEpochHeadAttested / increment)
+			n := baseReward * headWeight * (new(big.Int).Div(bal.PrevEpochHeadAttested, increment)).Uint64()
 			attDelta.HeadReward += n / (activeIncrement * weightDenominator)
 		}
 	}
diff --git a/beacon-chain/core/altair/epoch_precompute_test.go b/beacon-chain/core/altair/epoch_precompute_test.go
index 3b051f891..c39ab7fa1 100644
--- a/beacon-chain/core/altair/epoch_precompute_test.go
+++ b/beacon-chain/core/altair/epoch_precompute_test.go
@@ -3,6 +3,7 @@ package altair
 import (
 	"context"
 	"math"
+	"math/big"
 	"testing"
 
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/epoch/precompute"
@@ -56,10 +57,10 @@ func TestInitializeEpochValidators_Ok(t *testing.T) {
 		InactivityScore:              3,
 	}, v[3], "Incorrect validator 3 status")
 
-	wantedBalances := &precompute.Balance{
-		ActiveCurrentEpoch: 100,
-		ActivePrevEpoch:    200,
-	}
+	wantedBalances := precompute.NewBalance()
+	wantedBalances.ActiveCurrentEpoch = big.NewInt(100)
+	wantedBalances.ActivePrevEpoch = big.NewInt(200)
+
 	assert.DeepEqual(t, wantedBalances, b, "Incorrect wanted balance")
 }
 
@@ -75,7 +76,8 @@ func TestInitializeEpochValidators_Overflow(t *testing.T) {
 	})
 	require.NoError(t, err)
 	_, _, err = InitializePrecomputeValidators(context.Background(), s)
-	require.ErrorContains(t, "could not read every validator: addition overflows", err)
+	// This no longer overflows as total balance is big.int
+	require.NoError(t, err)
 }
 
 func TestInitializeEpochValidators_BadState(t *testing.T) {
@@ -133,10 +135,10 @@ func TestProcessEpochParticipation(t *testing.T) {
 		IsPrevEpochTargetAttester:    true,
 		IsPrevEpochHeadAttester:      true,
 	}, validators[3])
-	require.Equal(t, params.BeaconConfig().MaxEffectiveBalance*3, balance.PrevEpochAttested)
-	require.Equal(t, balance.CurrentEpochTargetAttested, params.BeaconConfig().MaxEffectiveBalance*2)
-	require.Equal(t, balance.PrevEpochTargetAttested, params.BeaconConfig().MaxEffectiveBalance*2)
-	require.Equal(t, balance.PrevEpochHeadAttested, params.BeaconConfig().MaxEffectiveBalance*1)
+	require.Equal(t, params.BeaconConfig().MaxEffectiveBalance*3, balance.PrevEpochAttested.Uint64())
+	require.Equal(t, balance.CurrentEpochTargetAttested.Uint64(), params.BeaconConfig().MaxEffectiveBalance*2)
+	require.Equal(t, balance.PrevEpochTargetAttested.Uint64(), params.BeaconConfig().MaxEffectiveBalance*2)
+	require.Equal(t, balance.PrevEpochHeadAttested.Uint64(), params.BeaconConfig().MaxEffectiveBalance*1)
 }
 
 func TestProcessEpochParticipation_InactiveValidator(t *testing.T) {
@@ -200,10 +202,10 @@ func TestProcessEpochParticipation_InactiveValidator(t *testing.T) {
 		IsPrevEpochTargetAttester:    true,
 		IsPrevEpochHeadAttester:      true,
 	}, validators[2])
-	require.Equal(t, balance.PrevEpochAttested, 2*params.BeaconConfig().MaxEffectiveBalance)
-	require.Equal(t, balance.CurrentEpochTargetAttested, params.BeaconConfig().MaxEffectiveBalance)
-	require.Equal(t, balance.PrevEpochTargetAttested, 2*params.BeaconConfig().MaxEffectiveBalance)
-	require.Equal(t, balance.PrevEpochHeadAttested, params.BeaconConfig().MaxEffectiveBalance)
+	require.Equal(t, balance.PrevEpochAttested.Uint64(), 2*params.BeaconConfig().MaxEffectiveBalance)
+	require.Equal(t, balance.CurrentEpochTargetAttested.Uint64(), params.BeaconConfig().MaxEffectiveBalance)
+	require.Equal(t, balance.PrevEpochTargetAttested.Uint64(), 2*params.BeaconConfig().MaxEffectiveBalance)
+	require.Equal(t, balance.PrevEpochHeadAttested.Uint64(), params.BeaconConfig().MaxEffectiveBalance)
 }
 
 func TestAttestationsDelta(t *testing.T) {
diff --git a/beacon-chain/core/altair/reward.go b/beacon-chain/core/altair/reward.go
index a3ca9125f..5e75e5711 100644
--- a/beacon-chain/core/altair/reward.go
+++ b/beacon-chain/core/altair/reward.go
@@ -1,12 +1,13 @@
 package altair
 
 import (
+	"math/big"
+
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v5/config/params"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/v5/math"
 )
 
 // BaseReward takes state and validator index and calculate
@@ -33,7 +34,7 @@ func BaseReward(s state.ReadOnlyBeaconState, index primitives.ValidatorIndex) (u
 }
 
 // BaseRewardWithTotalBalance calculates the base reward with the provided total balance.
-func BaseRewardWithTotalBalance(s state.ReadOnlyBeaconState, index primitives.ValidatorIndex, totalBalance uint64) (uint64, error) {
+func BaseRewardWithTotalBalance(s state.ReadOnlyBeaconState, index primitives.ValidatorIndex, totalBalance *big.Int) (uint64, error) {
 	val, err := s.ValidatorAtIndexReadOnly(index)
 	if err != nil {
 		return 0, err
@@ -53,10 +54,11 @@ func BaseRewardWithTotalBalance(s state.ReadOnlyBeaconState, index primitives.Va
 // def get_base_reward_per_increment(state: BeaconState) -> Gwei:
 //
 //	return Gwei(EFFECTIVE_BALANCE_INCREMENT * BASE_REWARD_FACTOR // integer_squareroot(get_total_active_balance(state)))
-func BaseRewardPerIncrement(activeBalance uint64) (uint64, error) {
-	if activeBalance == 0 {
+func BaseRewardPerIncrement(activeBalance *big.Int) (uint64, error) {
+	if activeBalance.Cmp(big.NewInt(0)) == 0 {
 		return 0, errors.New("active balance can't be 0")
 	}
 	cfg := params.BeaconConfig()
-	return cfg.EffectiveBalanceIncrement * cfg.BaseRewardFactor / math.CachedSquareRoot(activeBalance), nil
+	activeBalanceSqrt := new(big.Int).Sqrt(activeBalance).Uint64()
+	return cfg.EffectiveBalanceIncrement * cfg.BaseRewardFactor / activeBalanceSqrt, nil
 }
diff --git a/beacon-chain/core/altair/reward_test.go b/beacon-chain/core/altair/reward_test.go
index 55f623cf6..8253f5b12 100644
--- a/beacon-chain/core/altair/reward_test.go
+++ b/beacon-chain/core/altair/reward_test.go
@@ -2,6 +2,7 @@ package altair_test
 
 import (
 	"math"
+	"math/big"
 	"testing"
 
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/altair"
@@ -73,56 +74,56 @@ func Test_BaseRewardWithTotalBalance(t *testing.T) {
 	tests := []struct {
 		name          string
 		valIdx        primitives.ValidatorIndex
-		activeBalance uint64
+		activeBalance *big.Int
 		want          uint64
 		errString     string
 	}{
 		{
 			name:          "active balance is 0",
 			valIdx:        0,
-			activeBalance: 0,
+			activeBalance: big.NewInt(0),
 			want:          0,
 			errString:     "active balance can't be 0",
 		},
 		{
 			name:          "unknown validator",
 			valIdx:        2,
-			activeBalance: 1,
+			activeBalance: big.NewInt(1),
 			want:          0,
 			errString:     "validator index 2 does not exist",
 		},
 		{
 			name:          "active balance is 1",
 			valIdx:        0,
-			activeBalance: 1,
+			activeBalance: big.NewInt(1),
 			want:          2048000000000,
 			errString:     "",
 		},
 		{
 			name:          "active balance is 1eth",
 			valIdx:        0,
-			activeBalance: params.BeaconConfig().EffectiveBalanceIncrement,
+			activeBalance: new(big.Int).SetUint64(params.BeaconConfig().EffectiveBalanceIncrement),
 			want:          64765024,
 			errString:     "",
 		},
 		{
 			name:          "active balance is 32eth",
 			valIdx:        0,
-			activeBalance: params.BeaconConfig().MaxEffectiveBalance,
+			activeBalance: new(big.Int).SetUint64(params.BeaconConfig().MaxEffectiveBalance),
 			want:          11448672,
 			errString:     "",
 		},
 		{
 			name:          "active balance is 32eth * 1m validators",
 			valIdx:        0,
-			activeBalance: params.BeaconConfig().MaxEffectiveBalance * 1e9,
+			activeBalance: new(big.Int).SetUint64(params.BeaconConfig().MaxEffectiveBalance * 1e9),
 			want:          544,
 			errString:     "",
 		},
 		{
 			name:          "active balance is max uint64",
 			valIdx:        0,
-			activeBalance: math.MaxUint64,
+			activeBalance: new(big.Int).SetUint64(math.MaxUint64),
 			want:          448,
 			errString:     "",
 		},
@@ -143,43 +144,43 @@ func Test_BaseRewardPerIncrement(t *testing.T) {
 	helpers.ClearCache()
 	tests := []struct {
 		name          string
-		activeBalance uint64
+		activeBalance *big.Int
 		want          uint64
 		errString     string
 	}{
 		{
 			name:          "active balance is 0",
-			activeBalance: 0,
+			activeBalance: big.NewInt(0),
 			want:          0,
 			errString:     "active balance can't be 0",
 		},
 		{
 			name:          "active balance is 1",
-			activeBalance: 1,
+			activeBalance: big.NewInt(1),
 			want:          64000000000,
 			errString:     "",
 		},
 		{
 			name:          "active balance is 1eth",
-			activeBalance: params.BeaconConfig().EffectiveBalanceIncrement,
+			activeBalance: new(big.Int).SetUint64(params.BeaconConfig().EffectiveBalanceIncrement),
 			want:          2023907,
 			errString:     "",
 		},
 		{
 			name:          "active balance is 32eth",
-			activeBalance: params.BeaconConfig().MaxEffectiveBalance,
+			activeBalance: new(big.Int).SetUint64(params.BeaconConfig().MaxEffectiveBalance),
 			want:          357771,
 			errString:     "",
 		},
 		{
 			name:          "active balance is 32eth * 1m validators",
-			activeBalance: params.BeaconConfig().MaxEffectiveBalance * 1e9,
+			activeBalance: new(big.Int).SetUint64(params.BeaconConfig().MaxEffectiveBalance * 1e9),
 			want:          17,
 			errString:     "",
 		},
 		{
 			name:          "active balance is max uint64",
-			activeBalance: math.MaxUint64,
+			activeBalance: new(big.Int).SetUint64(math.MaxUint64),
 			want:          14,
 			errString:     "",
 		},
diff --git a/beacon-chain/core/altair/sync_committee.go b/beacon-chain/core/altair/sync_committee.go
index 9bfcd8434..1fa5f2c2e 100644
--- a/beacon-chain/core/altair/sync_committee.go
+++ b/beacon-chain/core/altair/sync_committee.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	goErrors "errors"
 	"fmt"
+	"math/big"
 	"time"
 
 	"github.com/pkg/errors"
@@ -139,8 +140,9 @@ func NextSyncCommitteeIndices(ctx context.Context, s state.BeaconState) ([]primi
 			return nil, err
 		}
 
-		effectiveBal := v.EffectiveBalance()
-		if effectiveBal*maxRandomByte >= cfg.MaxEffectiveBalance*uint64(randomByte) {
+		effectiveBal := new(big.Int).SetUint64(v.EffectiveBalance())
+		effectiveBal.Mul(effectiveBal, new(big.Int).SetUint64(maxRandomByte))
+		if effectiveBal.Cmp(new(big.Int).SetUint64(cfg.MaxEffectiveBalance*uint64(randomByte))) != -1 {
 			cIndices = append(cIndices, cIndex)
 		}
 	}
diff --git a/beacon-chain/core/epoch/epoch_processing.go b/beacon-chain/core/epoch/epoch_processing.go
index 41d3e748c..f0fa1a47f 100644
--- a/beacon-chain/core/epoch/epoch_processing.go
+++ b/beacon-chain/core/epoch/epoch_processing.go
@@ -7,6 +7,7 @@ package epoch
 import (
 	"context"
 	"fmt"
+	"math/big"
 	"sort"
 
 	"github.com/pkg/errors"
@@ -59,10 +60,10 @@ func (s sortableIndices) Less(i, j int) bool {
 //	  Note: ``get_total_balance`` returns ``EFFECTIVE_BALANCE_INCREMENT`` Gwei minimum to avoid divisions by zero.
 //	  """
 //	  return get_total_balance(state, get_unslashed_attesting_indices(state, attestations))
-func AttestingBalance(ctx context.Context, state state.ReadOnlyBeaconState, atts []*ethpb.PendingAttestation) (uint64, error) {
+func AttestingBalance(ctx context.Context, state state.ReadOnlyBeaconState, atts []*ethpb.PendingAttestation) (*big.Int, error) {
 	indices, err := UnslashedAttestingIndices(ctx, state, atts)
 	if err != nil {
-		return 0, errors.Wrap(err, "could not get attesting indices")
+		return big.NewInt(0), errors.Wrap(err, "could not get attesting indices")
 	}
 	return helpers.TotalBalance(state, indices), nil
 }
@@ -196,14 +197,23 @@ func ProcessSlashings(state state.BeaconState, slashingMultiplier uint64) (state
 
 	// a callback is used here to apply the following actions to all validators
 	// below equally.
-	increment := params.BeaconConfig().EffectiveBalanceIncrement
-	minSlashing := math.Min(totalSlashing*slashingMultiplier, totalBalance)
+	increment := new(big.Int).SetUint64(params.BeaconConfig().EffectiveBalanceIncrement)
+	totalSlashingTimesMultiplier := new(big.Int).SetUint64(totalSlashing * slashingMultiplier)
+	minSlashing := totalBalance
+	if totalSlashingTimesMultiplier.Cmp(totalBalance) == -1 {
+		minSlashing = totalSlashingTimesMultiplier
+	} else {
+		minSlashing = totalBalance
+	}
 	err = state.ApplyToEveryValidator(func(idx int, val *ethpb.Validator) (bool, *ethpb.Validator, error) {
 		correctEpoch := (currentEpoch + exitLength/2) == val.WithdrawableEpoch
 		if val.Slashed && correctEpoch {
-			penaltyNumerator := val.EffectiveBalance / increment * minSlashing
-			penalty := penaltyNumerator / totalBalance * increment
-			if err := helpers.DecreaseBalance(state, primitives.ValidatorIndex(idx), penalty); err != nil {
+			penalty := new(big.Int).SetUint64(val.EffectiveBalance) // val.EffectiveBalance
+			penalty.Div(penalty, increment)                         // val.EffectiveBalance / increment
+			penalty.Mul(penalty, minSlashing)                       // penaltyNumerator = val.EffectiveBalance / increment * minSlashing
+			penalty.Div(penalty, totalBalance)                      // penaltyNumerator / totalBalance
+			penalty = penalty.Mul(penalty, increment)               // penalty = penaltyNumerator / totalBalance * increment
+			if err := helpers.DecreaseBalance(state, primitives.ValidatorIndex(idx), penalty.Uint64()); err != nil {
 				return false, val, err
 			}
 			return true, val, nil
diff --git a/beacon-chain/core/epoch/epoch_processing_test.go b/beacon-chain/core/epoch/epoch_processing_test.go
index 71ebe63cd..c0953d16d 100644
--- a/beacon-chain/core/epoch/epoch_processing_test.go
+++ b/beacon-chain/core/epoch/epoch_processing_test.go
@@ -146,7 +146,7 @@ func TestAttestingBalance_CorrectBalance(t *testing.T) {
 	balance, err := epoch.AttestingBalance(context.Background(), beaconState, atts)
 	require.NoError(t, err)
 	wanted := 256 * params.BeaconConfig().MaxEffectiveBalance
-	assert.Equal(t, wanted, balance)
+	assert.Equal(t, wanted, balance.Uint64())
 }
 
 func TestProcessSlashings_NotSlashed(t *testing.T) {
diff --git a/beacon-chain/core/epoch/precompute/BUILD.bazel b/beacon-chain/core/epoch/precompute/BUILD.bazel
index 18a12269b..96ed2f18a 100644
--- a/beacon-chain/core/epoch/precompute/BUILD.bazel
+++ b/beacon-chain/core/epoch/precompute/BUILD.bazel
@@ -22,7 +22,6 @@ go_library(
         "//beacon-chain/state:go_default_library",
         "//config/params:go_default_library",
         "//consensus-types/primitives:go_default_library",
-        "//math:go_default_library",
         "//monitoring/tracing:go_default_library",
         "//proto/prysm/v1alpha1:go_default_library",
         "//proto/prysm/v1alpha1/attestation:go_default_library",
@@ -55,7 +54,6 @@ go_test(
         "//config/fieldparams:go_default_library",
         "//config/params:go_default_library",
         "//consensus-types/primitives:go_default_library",
-        "//math:go_default_library",
         "//proto/prysm/v1alpha1:go_default_library",
         "//proto/prysm/v1alpha1/attestation:go_default_library",
         "//runtime/version:go_default_library",
diff --git a/beacon-chain/core/epoch/precompute/attestation.go b/beacon-chain/core/epoch/precompute/attestation.go
index 9ec7fd0f1..f44aa3bbd 100644
--- a/beacon-chain/core/epoch/precompute/attestation.go
+++ b/beacon-chain/core/epoch/precompute/attestation.go
@@ -3,6 +3,7 @@ package precompute
 import (
 	"bytes"
 	"context"
+	"math/big"
 
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/helpers"
@@ -174,23 +175,24 @@ func UpdateValidator(vp []*Validator, record *Validator, indices []uint64, a *et
 func UpdateBalance(vp []*Validator, bBal *Balance, stateVersion int) *Balance {
 	for _, v := range vp {
 		if !v.IsSlashed {
+			currentEpochEffectiveBalance := new(big.Int).SetUint64(v.CurrentEpochEffectiveBalance)
 			if v.IsCurrentEpochAttester {
-				bBal.CurrentEpochAttested += v.CurrentEpochEffectiveBalance
+				bBal.CurrentEpochAttested.Add(bBal.CurrentEpochAttested, currentEpochEffectiveBalance)
 			}
 			if v.IsCurrentEpochTargetAttester {
-				bBal.CurrentEpochTargetAttested += v.CurrentEpochEffectiveBalance
+				bBal.CurrentEpochTargetAttested.Add(bBal.CurrentEpochTargetAttested, currentEpochEffectiveBalance)
 			}
 			if stateVersion == version.Phase0 && v.IsPrevEpochAttester {
-				bBal.PrevEpochAttested += v.CurrentEpochEffectiveBalance
+				bBal.PrevEpochAttested.Add(bBal.PrevEpochAttested, currentEpochEffectiveBalance)
 			}
 			if stateVersion >= version.Altair && v.IsPrevEpochSourceAttester {
-				bBal.PrevEpochAttested += v.CurrentEpochEffectiveBalance
+				bBal.PrevEpochAttested.Add(bBal.PrevEpochAttested, currentEpochEffectiveBalance)
 			}
 			if v.IsPrevEpochTargetAttester {
-				bBal.PrevEpochTargetAttested += v.CurrentEpochEffectiveBalance
+				bBal.PrevEpochTargetAttested.Add(bBal.PrevEpochTargetAttested, currentEpochEffectiveBalance)
 			}
 			if v.IsPrevEpochHeadAttester {
-				bBal.PrevEpochHeadAttested += v.CurrentEpochEffectiveBalance
+				bBal.PrevEpochHeadAttested.Add(bBal.PrevEpochHeadAttested, currentEpochEffectiveBalance)
 			}
 		}
 	}
@@ -202,26 +204,27 @@ func UpdateBalance(vp []*Validator, bBal *Balance, stateVersion int) *Balance {
 // have EffectiveBalanceIncrement(1 eth) as a lower bound.
 func EnsureBalancesLowerBound(bBal *Balance) *Balance {
 	ebi := params.BeaconConfig().EffectiveBalanceIncrement
-	if ebi > bBal.ActiveCurrentEpoch {
-		bBal.ActiveCurrentEpoch = ebi
+	ebiBig := new(big.Int).SetUint64(ebi)
+	if ebiBig.Cmp(bBal.ActiveCurrentEpoch) == 1 {
+		bBal.ActiveCurrentEpoch = ebiBig
 	}
-	if ebi > bBal.ActivePrevEpoch {
-		bBal.ActivePrevEpoch = ebi
+	if ebiBig.Cmp(bBal.ActivePrevEpoch) == 1 {
+		bBal.ActivePrevEpoch = ebiBig
 	}
-	if ebi > bBal.CurrentEpochAttested {
-		bBal.CurrentEpochAttested = ebi
+	if ebiBig.Cmp(bBal.CurrentEpochAttested) == 1 {
+		bBal.CurrentEpochAttested = ebiBig
 	}
-	if ebi > bBal.CurrentEpochTargetAttested {
-		bBal.CurrentEpochTargetAttested = ebi
+	if ebiBig.Cmp(bBal.CurrentEpochTargetAttested) == 1 {
+		bBal.CurrentEpochTargetAttested = ebiBig
 	}
-	if ebi > bBal.PrevEpochAttested {
-		bBal.PrevEpochAttested = ebi
+	if ebiBig.Cmp(bBal.PrevEpochAttested) == 1 {
+		bBal.PrevEpochAttested = ebiBig
 	}
-	if ebi > bBal.PrevEpochTargetAttested {
-		bBal.PrevEpochTargetAttested = ebi
+	if ebiBig.Cmp(bBal.PrevEpochTargetAttested) == 1 {
+		bBal.PrevEpochTargetAttested = ebiBig
 	}
-	if ebi > bBal.PrevEpochHeadAttested {
-		bBal.PrevEpochHeadAttested = ebi
+	if ebiBig.Cmp(bBal.PrevEpochHeadAttested) == 1 {
+		bBal.PrevEpochHeadAttested = ebiBig
 	}
 	return bBal
 }
diff --git a/beacon-chain/core/epoch/precompute/attestation_test.go b/beacon-chain/core/epoch/precompute/attestation_test.go
index 1801afa9f..d71f8b3e9 100644
--- a/beacon-chain/core/epoch/precompute/attestation_test.go
+++ b/beacon-chain/core/epoch/precompute/attestation_test.go
@@ -2,6 +2,7 @@ package precompute_test
 
 import (
 	"context"
+	"math/big"
 	"testing"
 
 	"github.com/prysmaticlabs/go-bitfield"
@@ -47,6 +48,10 @@ func TestUpdateValidator_InclusionOnlyCountsPrevEpoch(t *testing.T) {
 }
 
 func TestUpdateBalance(t *testing.T) {
+	ebi := new(big.Int).SetUint64(params.BeaconConfig().EffectiveBalanceIncrement)
+	ebiTimesHundred := big.NewInt(100).Mul(big.NewInt(100), ebi)
+	ebiTimesTwoHundred := big.NewInt(200).Mul(big.NewInt(200), ebi)
+	ebiTimesThreeHundred := big.NewInt(300).Mul(big.NewInt(300), ebi)
 	vp := []*precompute.Validator{
 		{IsCurrentEpochAttester: true, CurrentEpochEffectiveBalance: 100 * params.BeaconConfig().EffectiveBalanceIncrement},
 		{IsCurrentEpochTargetAttester: true, IsCurrentEpochAttester: true, CurrentEpochEffectiveBalance: 100 * params.BeaconConfig().EffectiveBalanceIncrement},
@@ -58,19 +63,23 @@ func TestUpdateBalance(t *testing.T) {
 		{IsSlashed: true, IsCurrentEpochAttester: true, CurrentEpochEffectiveBalance: 100 * params.BeaconConfig().EffectiveBalanceIncrement},
 	}
 	wantedPBal := &precompute.Balance{
-		ActiveCurrentEpoch:         params.BeaconConfig().EffectiveBalanceIncrement,
-		ActivePrevEpoch:            params.BeaconConfig().EffectiveBalanceIncrement,
-		CurrentEpochAttested:       200 * params.BeaconConfig().EffectiveBalanceIncrement,
-		CurrentEpochTargetAttested: 200 * params.BeaconConfig().EffectiveBalanceIncrement,
-		PrevEpochAttested:          300 * params.BeaconConfig().EffectiveBalanceIncrement,
-		PrevEpochTargetAttested:    100 * params.BeaconConfig().EffectiveBalanceIncrement,
-		PrevEpochHeadAttested:      200 * params.BeaconConfig().EffectiveBalanceIncrement,
+		ActiveCurrentEpoch:         ebi,
+		ActivePrevEpoch:            ebi,
+		CurrentEpochAttested:       ebiTimesTwoHundred,
+		CurrentEpochTargetAttested: ebiTimesTwoHundred,
+		PrevEpochAttested:          ebiTimesThreeHundred,
+		PrevEpochTargetAttested:    ebiTimesHundred,
+		PrevEpochHeadAttested:      ebiTimesTwoHundred,
 	}
-	pBal := precompute.UpdateBalance(vp, &precompute.Balance{}, version.Phase0)
+	pBal := precompute.NewBalance()
+	pBal = precompute.UpdateBalance(vp, pBal, version.Phase0)
 	assert.DeepEqual(t, wantedPBal, pBal, "Incorrect balance calculations")
 }
 
 func TestUpdateBalanceDifferentVersions(t *testing.T) {
+	ebi := new(big.Int).SetUint64(params.BeaconConfig().EffectiveBalanceIncrement)
+	ebiTimesHundred := big.NewInt(100).Mul(big.NewInt(100), ebi)
+	ebiTimesTwoHundred := big.NewInt(200).Mul(big.NewInt(200), ebi)
 	vp := []*precompute.Validator{
 		{IsCurrentEpochAttester: true, CurrentEpochEffectiveBalance: 100 * params.BeaconConfig().EffectiveBalanceIncrement},
 		{IsCurrentEpochTargetAttester: true, IsCurrentEpochAttester: true, CurrentEpochEffectiveBalance: 100 * params.BeaconConfig().EffectiveBalanceIncrement},
@@ -82,18 +91,19 @@ func TestUpdateBalanceDifferentVersions(t *testing.T) {
 		{IsSlashed: true, IsCurrentEpochAttester: true, CurrentEpochEffectiveBalance: 100 * params.BeaconConfig().EffectiveBalanceIncrement},
 	}
 	wantedPBal := &precompute.Balance{
-		ActiveCurrentEpoch:         params.BeaconConfig().EffectiveBalanceIncrement,
-		ActivePrevEpoch:            params.BeaconConfig().EffectiveBalanceIncrement,
-		CurrentEpochAttested:       200 * params.BeaconConfig().EffectiveBalanceIncrement,
-		CurrentEpochTargetAttested: 200 * params.BeaconConfig().EffectiveBalanceIncrement,
-		PrevEpochAttested:          params.BeaconConfig().EffectiveBalanceIncrement,
-		PrevEpochTargetAttested:    100 * params.BeaconConfig().EffectiveBalanceIncrement,
-		PrevEpochHeadAttested:      200 * params.BeaconConfig().EffectiveBalanceIncrement,
+		ActiveCurrentEpoch:         ebi,
+		ActivePrevEpoch:            ebi,
+		CurrentEpochAttested:       ebiTimesTwoHundred,
+		CurrentEpochTargetAttested: ebiTimesTwoHundred,
+		PrevEpochAttested:          ebi,
+		PrevEpochTargetAttested:    ebiTimesHundred,
+		PrevEpochHeadAttested:      ebiTimesTwoHundred,
 	}
-	pBal := precompute.UpdateBalance(vp, &precompute.Balance{}, version.Bellatrix)
+	pBal := precompute.NewBalance()
+	pBal = precompute.UpdateBalance(vp, pBal, version.Bellatrix)
 	assert.DeepEqual(t, wantedPBal, pBal, "Incorrect balance calculations")
 
-	pBal = precompute.UpdateBalance(vp, &precompute.Balance{}, version.Capella)
+	pBal = precompute.UpdateBalance(vp, precompute.NewBalance(), version.Capella)
 	assert.DeepEqual(t, wantedPBal, pBal, "Incorrect balance calculations")
 }
 
@@ -178,6 +188,7 @@ func TestProcessAttestations(t *testing.T) {
 	params.OverrideBeaconConfig(params.MinimalSpecConfig())
 
 	validators := uint64(128)
+	pBal := precompute.NewBalance()
 	beaconState, _ := util.DeterministicGenesisState(t, validators)
 	require.NoError(t, beaconState.SetSlot(params.BeaconConfig().SlotsPerEpoch))
 	c := helpers.SlotCommitteeCount(validators)
@@ -206,7 +217,7 @@ func TestProcessAttestations(t *testing.T) {
 	for i := 0; i < len(pVals); i++ {
 		pVals[i] = &precompute.Validator{CurrentEpochEffectiveBalance: 100}
 	}
-	pVals, _, err = precompute.ProcessAttestations(context.Background(), beaconState, pVals, &precompute.Balance{})
+	pVals, _, err = precompute.ProcessAttestations(context.Background(), beaconState, pVals, pBal)
 	require.NoError(t, err)
 
 	committee, err := helpers.BeaconCommitteeFromState(context.Background(), beaconState, att1.Data.Slot, att1.Data.CommitteeIndex)
@@ -230,14 +241,14 @@ func TestProcessAttestations(t *testing.T) {
 }
 
 func TestEnsureBalancesLowerBound(t *testing.T) {
-	b := &precompute.Balance{}
+	b := precompute.NewBalance()
 	b = precompute.EnsureBalancesLowerBound(b)
 	balanceIncrement := params.BeaconConfig().EffectiveBalanceIncrement
-	assert.Equal(t, balanceIncrement, b.ActiveCurrentEpoch, "Did not get wanted active current balance")
-	assert.Equal(t, balanceIncrement, b.ActivePrevEpoch, "Did not get wanted active previous balance")
-	assert.Equal(t, balanceIncrement, b.CurrentEpochAttested, "Did not get wanted current attested balance")
-	assert.Equal(t, balanceIncrement, b.CurrentEpochTargetAttested, "Did not get wanted target attested balance")
-	assert.Equal(t, balanceIncrement, b.PrevEpochAttested, "Did not get wanted prev attested balance")
-	assert.Equal(t, balanceIncrement, b.PrevEpochTargetAttested, "Did not get wanted prev target attested balance")
-	assert.Equal(t, balanceIncrement, b.PrevEpochHeadAttested, "Did not get wanted prev head attested balance")
+	assert.Equal(t, balanceIncrement, b.ActiveCurrentEpoch.Uint64(), "Did not get wanted active current balance")
+	assert.Equal(t, balanceIncrement, b.ActivePrevEpoch.Uint64(), "Did not get wanted active previous balance")
+	assert.Equal(t, balanceIncrement, b.CurrentEpochAttested.Uint64(), "Did not get wanted current attested balance")
+	assert.Equal(t, balanceIncrement, b.CurrentEpochTargetAttested.Uint64(), "Did not get wanted target attested balance")
+	assert.Equal(t, balanceIncrement, b.PrevEpochAttested.Uint64(), "Did not get wanted prev attested balance")
+	assert.Equal(t, balanceIncrement, b.PrevEpochTargetAttested.Uint64(), "Did not get wanted prev target attested balance")
+	assert.Equal(t, balanceIncrement, b.PrevEpochHeadAttested.Uint64(), "Did not get wanted prev head attested balance")
 }
diff --git a/beacon-chain/core/epoch/precompute/justification_finalization.go b/beacon-chain/core/epoch/precompute/justification_finalization.go
index e31d95be7..b8bca83a0 100644
--- a/beacon-chain/core/epoch/precompute/justification_finalization.go
+++ b/beacon-chain/core/epoch/precompute/justification_finalization.go
@@ -1,6 +1,8 @@
 package precompute
 
 import (
+	"math/big"
+
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/go-bitfield"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/helpers"
@@ -69,15 +71,19 @@ func ProcessJustificationAndFinalizationPreCompute(state state.BeaconState, pBal
 }
 
 // processJustificationBits processes the justification bits during epoch processing.
-func processJustificationBits(state state.BeaconState, totalActiveBalance, prevEpochTargetBalance, currEpochTargetBalance uint64) bitfield.Bitvector4 {
+func processJustificationBits(state state.BeaconState, totalActiveBalance, prevEpochTargetBalance, currEpochTargetBalance *big.Int) bitfield.Bitvector4 {
 	newBits := state.JustificationBits()
 	newBits.Shift(1)
 	// If 2/3 or more of total balance attested in the previous epoch.
-	if 3*prevEpochTargetBalance >= 2*totalActiveBalance {
+	three := big.NewInt(3)
+	prevEpochTargetBalanceTimesThree := new(big.Int).Mul(three, prevEpochTargetBalance)
+	currEpochTargetBalanceTimesThree := new(big.Int).Mul(three, currEpochTargetBalance)
+	totalActiveBalanceTimesTwo := new(big.Int).Mul(big.NewInt(2), totalActiveBalance)
+	if prevEpochTargetBalanceTimesThree.Cmp(totalActiveBalanceTimesTwo) != -1 {
 		newBits.SetBitAt(1, true)
 	}
 
-	if 3*currEpochTargetBalance >= 2*totalActiveBalance {
+	if currEpochTargetBalanceTimesThree.Cmp(totalActiveBalanceTimesTwo) != -1 {
 		newBits.SetBitAt(0, true)
 	}
 
diff --git a/beacon-chain/core/epoch/precompute/justification_finalization_test.go b/beacon-chain/core/epoch/precompute/justification_finalization_test.go
index 4fd755636..bbb5abc25 100644
--- a/beacon-chain/core/epoch/precompute/justification_finalization_test.go
+++ b/beacon-chain/core/epoch/precompute/justification_finalization_test.go
@@ -2,6 +2,7 @@ package precompute_test
 
 import (
 	"context"
+	"math/big"
 	"testing"
 
 	"github.com/prysmaticlabs/go-bitfield"
@@ -42,7 +43,8 @@ func TestProcessJustificationAndFinalizationPreCompute_ConsecutiveEpochs(t *test
 	state, err := state_native.InitializeFromProtoPhase0(base)
 	require.NoError(t, err)
 	attestedBalance := 4 * uint64(e) * 3 / 2
-	b := &precompute.Balance{PrevEpochTargetAttested: attestedBalance}
+	b := precompute.NewBalance()
+	b.PrevEpochTargetAttested = new(big.Int).SetUint64(attestedBalance)
 	newState, err := precompute.ProcessJustificationAndFinalizationPreCompute(state, b)
 	require.NoError(t, err)
 	rt := [32]byte{byte(64)}
@@ -79,7 +81,8 @@ func TestProcessJustificationAndFinalizationPreCompute_JustifyCurrentEpoch(t *te
 	state, err := state_native.InitializeFromProtoPhase0(base)
 	require.NoError(t, err)
 	attestedBalance := 4 * uint64(e) * 3 / 2
-	b := &precompute.Balance{PrevEpochTargetAttested: attestedBalance}
+	b := precompute.NewBalance()
+	b.PrevEpochTargetAttested = new(big.Int).SetUint64(attestedBalance)
 	newState, err := precompute.ProcessJustificationAndFinalizationPreCompute(state, b)
 	require.NoError(t, err)
 	rt := [32]byte{byte(64)}
@@ -115,7 +118,8 @@ func TestProcessJustificationAndFinalizationPreCompute_JustifyPrevEpoch(t *testi
 	state, err := state_native.InitializeFromProtoPhase0(base)
 	require.NoError(t, err)
 	attestedBalance := 4 * uint64(e) * 3 / 2
-	b := &precompute.Balance{PrevEpochTargetAttested: attestedBalance}
+	b := precompute.NewBalance()
+	b.PrevEpochTargetAttested = new(big.Int).SetUint64(attestedBalance)
 	newState, err := precompute.ProcessJustificationAndFinalizationPreCompute(state, b)
 	require.NoError(t, err)
 	rt := [32]byte{byte(64)}
diff --git a/beacon-chain/core/epoch/precompute/new.go b/beacon-chain/core/epoch/precompute/new.go
index b4f74900e..ecdfdb76c 100644
--- a/beacon-chain/core/epoch/precompute/new.go
+++ b/beacon-chain/core/epoch/precompute/new.go
@@ -5,6 +5,7 @@ package precompute
 
 import (
 	"context"
+	"math/big"
 
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/helpers"
@@ -22,7 +23,7 @@ func New(ctx context.Context, s state.BeaconState) ([]*Validator, *Balance, erro
 	defer span.End()
 
 	pValidators := make([]*Validator, s.NumValidators())
-	pBal := &Balance{}
+	pBal := NewBalance()
 
 	currentEpoch := time.CurrentEpoch(s)
 	prevEpoch := time.PrevEpoch(s)
@@ -30,6 +31,7 @@ func New(ctx context.Context, s state.BeaconState) ([]*Validator, *Balance, erro
 	if err := s.ReadFromEveryValidator(func(idx int, val state.ReadOnlyValidator) error {
 		// Was validator withdrawable or slashed
 		withdrawable := prevEpoch+1 >= val.WithdrawableEpoch()
+		effectiveBalance := new(big.Int).SetUint64(val.EffectiveBalance())
 		pVal := &Validator{
 			IsSlashed:                    val.Slashed(),
 			IsWithdrawableCurrentEpoch:   withdrawable,
@@ -38,12 +40,12 @@ func New(ctx context.Context, s state.BeaconState) ([]*Validator, *Balance, erro
 		// Was validator active current epoch
 		if helpers.IsActiveValidatorUsingTrie(val, currentEpoch) {
 			pVal.IsActiveCurrentEpoch = true
-			pBal.ActiveCurrentEpoch += val.EffectiveBalance()
+			pBal.ActiveCurrentEpoch.Add(pBal.ActiveCurrentEpoch, effectiveBalance)
 		}
 		// Was validator active previous epoch
 		if helpers.IsActiveValidatorUsingTrie(val, prevEpoch) {
 			pVal.IsActivePrevEpoch = true
-			pBal.ActivePrevEpoch += val.EffectiveBalance()
+			pBal.ActivePrevEpoch.Add(pBal.ActivePrevEpoch, effectiveBalance)
 		}
 		// Set inclusion slot and inclusion distance to be max, they will be compared and replaced
 		// with the lower values
@@ -57,3 +59,15 @@ func New(ctx context.Context, s state.BeaconState) ([]*Validator, *Balance, erro
 	}
 	return pValidators, pBal, nil
 }
+
+func NewBalance() *Balance {
+	return &Balance{
+		ActiveCurrentEpoch:         big.NewInt(0),
+		ActivePrevEpoch:            big.NewInt(0),
+		CurrentEpochAttested:       big.NewInt(0),
+		CurrentEpochTargetAttested: big.NewInt(0),
+		PrevEpochAttested:          big.NewInt(0),
+		PrevEpochHeadAttested:      big.NewInt(0),
+		PrevEpochTargetAttested:    big.NewInt(0),
+	}
+}
diff --git a/beacon-chain/core/epoch/precompute/new_test.go b/beacon-chain/core/epoch/precompute/new_test.go
index b87a5f3fd..684151633 100644
--- a/beacon-chain/core/epoch/precompute/new_test.go
+++ b/beacon-chain/core/epoch/precompute/new_test.go
@@ -2,6 +2,7 @@ package precompute_test
 
 import (
 	"context"
+	"math/big"
 	"testing"
 
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/epoch/precompute"
@@ -57,9 +58,8 @@ func TestNew(t *testing.T) {
 		InclusionSlot:                e,
 	}, v[3], "Incorrect validator 3 status")
 
-	wantedBalances := &precompute.Balance{
-		ActiveCurrentEpoch: 100,
-		ActivePrevEpoch:    200,
-	}
+	wantedBalances := precompute.NewBalance()
+	wantedBalances.ActiveCurrentEpoch = big.NewInt(100)
+	wantedBalances.ActivePrevEpoch = big.NewInt(200)
 	assert.DeepEqual(t, wantedBalances, b, "Incorrect wanted balance")
 }
diff --git a/beacon-chain/core/epoch/precompute/reward_penalty.go b/beacon-chain/core/epoch/precompute/reward_penalty.go
index 0ee21db77..654710a60 100644
--- a/beacon-chain/core/epoch/precompute/reward_penalty.go
+++ b/beacon-chain/core/epoch/precompute/reward_penalty.go
@@ -1,13 +1,14 @@
 package precompute
 
 import (
+	"math/big"
+
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/time"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v5/config/params"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/v5/math"
 )
 
 type attesterRewardsFunc func(state.ReadOnlyBeaconState, *Balance, []*Validator) ([]uint64, []uint64, error)
@@ -72,7 +73,7 @@ func AttestationsDelta(state state.ReadOnlyBeaconState, pBal *Balance, vp []*Val
 	prevEpoch := time.PrevEpoch(state)
 	finalizedEpoch := state.FinalizedCheckpointEpoch()
 
-	sqrtActiveCurrentEpoch := math.CachedSquareRoot(pBal.ActiveCurrentEpoch)
+	sqrtActiveCurrentEpoch := new(big.Int).Sqrt(pBal.ActiveCurrentEpoch).Uint64()
 	for i, v := range vp {
 		rewards[i], penalties[i] = attestationDelta(pBal, sqrtActiveCurrentEpoch, v, prevEpoch, finalizedEpoch)
 	}
@@ -80,16 +81,16 @@ func AttestationsDelta(state state.ReadOnlyBeaconState, pBal *Balance, vp []*Val
 }
 
 func attestationDelta(pBal *Balance, sqrtActiveCurrentEpoch uint64, v *Validator, prevEpoch, finalizedEpoch primitives.Epoch) (uint64, uint64) {
-	if !EligibleForRewards(v) || pBal.ActiveCurrentEpoch == 0 {
+	if !EligibleForRewards(v) || pBal.ActiveCurrentEpoch.Cmp(big.NewInt(0)) != 1 {
 		return 0, 0
 	}
 
 	baseRewardsPerEpoch := params.BeaconConfig().BaseRewardsPerEpoch
-	effectiveBalanceIncrement := params.BeaconConfig().EffectiveBalanceIncrement
+	effectiveBalanceIncrement := new(big.Int).SetUint64(params.BeaconConfig().EffectiveBalanceIncrement)
 	vb := v.CurrentEpochEffectiveBalance
 	br := vb * params.BeaconConfig().BaseRewardFactor / sqrtActiveCurrentEpoch / baseRewardsPerEpoch
 	r, p := uint64(0), uint64(0)
-	currentEpochBalance := pBal.ActiveCurrentEpoch / effectiveBalanceIncrement
+	currentEpochBalance := new(big.Int).Div(pBal.ActiveCurrentEpoch, effectiveBalanceIncrement).Uint64()
 
 	// Process source reward / penalty
 	if v.IsPrevEpochAttester && !v.IsSlashed {
@@ -102,7 +103,7 @@ func attestationDelta(pBal *Balance, sqrtActiveCurrentEpoch uint64, v *Validator
 			// optimal participation receives full base reward compensation here.
 			r += br
 		} else {
-			rewardNumerator := br * (pBal.PrevEpochAttested / effectiveBalanceIncrement)
+			rewardNumerator := br * (new(big.Int).Div(pBal.PrevEpochAttested, effectiveBalanceIncrement)).Uint64()
 			r += rewardNumerator / currentEpochBalance
 		}
 	} else {
@@ -116,7 +117,7 @@ func attestationDelta(pBal *Balance, sqrtActiveCurrentEpoch uint64, v *Validator
 			// optimal participation receives full base reward compensation here.
 			r += br
 		} else {
-			rewardNumerator := br * (pBal.PrevEpochTargetAttested / effectiveBalanceIncrement)
+			rewardNumerator := br * (new(big.Int).Div(pBal.PrevEpochTargetAttested, effectiveBalanceIncrement)).Uint64()
 			r += rewardNumerator / currentEpochBalance
 		}
 	} else {
@@ -130,7 +131,7 @@ func attestationDelta(pBal *Balance, sqrtActiveCurrentEpoch uint64, v *Validator
 			// optimal participation receives full base reward compensation here.
 			r += br
 		} else {
-			rewardNumerator := br * (pBal.PrevEpochHeadAttested / effectiveBalanceIncrement)
+			rewardNumerator := br * (new(big.Int).Div(pBal.PrevEpochHeadAttested, effectiveBalanceIncrement)).Uint64()
 			r += rewardNumerator / currentEpochBalance
 		}
 	} else {
@@ -160,7 +161,7 @@ func ProposersDelta(state state.ReadOnlyBeaconState, pBal *Balance, vp []*Valida
 	rewards := make([]uint64, numofVals)
 
 	totalBalance := pBal.ActiveCurrentEpoch
-	balanceSqrt := math.CachedSquareRoot(totalBalance)
+	balanceSqrt := new(big.Int).Sqrt(totalBalance).Uint64()
 	// Balance square root cannot be 0, this prevents division by 0.
 	if balanceSqrt == 0 {
 		balanceSqrt = 1
diff --git a/beacon-chain/core/epoch/precompute/reward_penalty_test.go b/beacon-chain/core/epoch/precompute/reward_penalty_test.go
index 4c4e3c409..13952788d 100644
--- a/beacon-chain/core/epoch/precompute/reward_penalty_test.go
+++ b/beacon-chain/core/epoch/precompute/reward_penalty_test.go
@@ -2,6 +2,7 @@ package precompute
 
 import (
 	"context"
+	"math/big"
 	"testing"
 
 	"github.com/pkg/errors"
@@ -14,7 +15,6 @@ import (
 	fieldparams "github.com/prysmaticlabs/prysm/v5/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/v5/config/params"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/v5/math"
 	ethpb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v5/runtime/version"
 	"github.com/prysmaticlabs/prysm/v5/testing/assert"
@@ -97,8 +97,10 @@ func TestAttestationDeltaPrecompute(t *testing.T) {
 
 	// Add some variances to target and head balances.
 	// See: https://github.com/prysmaticlabs/prysm/issues/5593
-	bp.PrevEpochTargetAttested /= 2
-	bp.PrevEpochHeadAttested = bp.PrevEpochHeadAttested * 2 / 3
+	two := big.NewInt(2)
+	three := big.NewInt(3)
+	bp.PrevEpochTargetAttested.Div(bp.PrevEpochTargetAttested, two)
+	bp.PrevEpochHeadAttested.Div(new(big.Int).Mul(bp.PrevEpochHeadAttested, two), three)
 	rewards, penalties, err := AttestationsDelta(beaconState, bp, vp)
 	require.NoError(t, err)
 	attestedBalance, err := epoch.AttestingBalance(context.Background(), beaconState, atts)
@@ -112,14 +114,23 @@ func TestAttestationDeltaPrecompute(t *testing.T) {
 		require.NoError(t, err, "Could not get base reward")
 
 		// Base rewards for getting source right
-		wanted := attestedBalance*base/totalBalance +
-			bp.PrevEpochTargetAttested*base/totalBalance +
-			bp.PrevEpochHeadAttested*base/totalBalance
+		baseBig := new(big.Int).SetUint64(base)
+		attestedBalanceTimesBase := new(big.Int).Mul(attestedBalance, baseBig)
+		prevEpochTargetAttestedTimesBase := new(big.Int).Mul(bp.PrevEpochTargetAttested, baseBig)
+		prevEpochHeadAttestedTimesBase := new(big.Int).Mul(bp.PrevEpochHeadAttested, baseBig)
+
+		attestedBalanceTimesBaseDivTotalBal := new(big.Int).Div(attestedBalanceTimesBase, totalBalance)
+		prevEpochTargetAttestedTimesBaseDivTotalBal := new(big.Int).Div(prevEpochTargetAttestedTimesBase, totalBalance)
+		prevEpochHeadAttestedTimesBaseDivTotalBal := new(big.Int).Div(prevEpochHeadAttestedTimesBase, totalBalance)
+		wanted := new(big.Int).Add(new(big.Int).Add(attestedBalanceTimesBaseDivTotalBal, prevEpochTargetAttestedTimesBaseDivTotalBal), prevEpochHeadAttestedTimesBaseDivTotalBal)
 		// Base rewards for proposer and attesters working together getting attestation
 		// on chain in the fatest manner
 		proposerReward := base / params.BeaconConfig().ProposerRewardQuotient
-		wanted += (base-proposerReward)*uint64(params.BeaconConfig().MinAttestationInclusionDelay) - 1
-		assert.Equal(t, wanted, rewards[i], "Unexpected reward balance for validator with index %d", i)
+		baseSubProposerReward := new(big.Int).Sub(baseBig, new(big.Int).SetUint64(proposerReward))
+		baseSubProposerRewardTimesMinAttestIncDelay := new(big.Int).Mul(baseSubProposerReward, new(big.Int).SetUint64(uint64(params.BeaconConfig().MinAttestationInclusionDelay)))
+		baseSubProposerRewardTimesMinAttestIncDelaySubOne := new(big.Int).Sub(baseSubProposerRewardTimesMinAttestIncDelay, big.NewInt(1))
+		wanted.Add(wanted, baseSubProposerRewardTimesMinAttestIncDelaySubOne)
+		assert.Equal(t, wanted.Uint64(), rewards[i], "Unexpected reward balance for validator with index %d", i)
 		// Since all these validators attested, they shouldn't get penalized.
 		assert.Equal(t, uint64(0), penalties[i], "Unexpected penalty balance")
 	}
@@ -173,7 +184,7 @@ func TestAttestationDeltas_ZeroEpoch(t *testing.T) {
 	pVals, pBal, err = ProcessAttestations(context.Background(), beaconState, pVals, pBal)
 	require.NoError(t, err)
 
-	pBal.ActiveCurrentEpoch = 0 // Could cause a divide by zero panic.
+	pBal.ActiveCurrentEpoch = big.NewInt(0) // Could cause a divide by zero panic.
 
 	_, _, err = AttestationsDelta(beaconState, pBal, pVals)
 	require.NoError(t, err)
@@ -307,18 +318,22 @@ func TestProposerDeltaPrecompute_HappyCase(t *testing.T) {
 	require.NoError(t, err)
 
 	proposerIndex := primitives.ValidatorIndex(1)
-	b := &Balance{ActiveCurrentEpoch: 1000}
+	b := NewBalance()
+	b.ActiveCurrentEpoch = big.NewInt(1000)
 	v := []*Validator{
 		{IsPrevEpochAttester: true, CurrentEpochEffectiveBalance: 32, ProposerIndex: proposerIndex},
 	}
 	r, err := ProposersDelta(beaconState, b, v)
 	require.NoError(t, err)
 
-	baseReward := v[0].CurrentEpochEffectiveBalance * params.BeaconConfig().BaseRewardFactor /
-		math.IntegerSquareRoot(b.ActiveCurrentEpoch) / params.BeaconConfig().BaseRewardsPerEpoch
-	proposerReward := baseReward / params.BeaconConfig().ProposerRewardQuotient
+	activeCurrEpochSqrt := new(big.Int).Sqrt(b.ActiveCurrentEpoch)
+	currEpochEffectBal := new(big.Int).SetUint64(v[0].CurrentEpochEffectiveBalance)
+	currEpochEffBalTimesBrFact := new(big.Int).Mul(currEpochEffectBal, new(big.Int).SetUint64(params.BeaconConfig().BaseRewardFactor))
+	currEpochEffBalTimesBrFactDivSqrt := new(big.Int).Div(currEpochEffBalTimesBrFact, activeCurrEpochSqrt)
+	baseReward := new(big.Int).Div(currEpochEffBalTimesBrFactDivSqrt, new(big.Int).SetUint64(params.BeaconConfig().BaseRewardsPerEpoch))
+	proposerReward := new(big.Int).Div(baseReward, new(big.Int).SetUint64(params.BeaconConfig().ProposerRewardQuotient))
 
-	assert.Equal(t, proposerReward, r[proposerIndex], "Unexpected proposer reward")
+	assert.Equal(t, proposerReward.Uint64(), r[proposerIndex], "Unexpected proposer reward")
 }
 
 func TestProposerDeltaPrecompute_ValidatorIndexOutOfRange(t *testing.T) {
@@ -329,7 +344,8 @@ func TestProposerDeltaPrecompute_ValidatorIndexOutOfRange(t *testing.T) {
 	require.NoError(t, err)
 
 	proposerIndex := primitives.ValidatorIndex(validatorCount)
-	b := &Balance{ActiveCurrentEpoch: 1000}
+	b := NewBalance()
+	b.ActiveCurrentEpoch = big.NewInt(1000)
 	v := []*Validator{
 		{IsPrevEpochAttester: true, CurrentEpochEffectiveBalance: 32, ProposerIndex: proposerIndex},
 	}
@@ -345,7 +361,8 @@ func TestProposerDeltaPrecompute_SlashedCase(t *testing.T) {
 	require.NoError(t, err)
 
 	proposerIndex := primitives.ValidatorIndex(1)
-	b := &Balance{ActiveCurrentEpoch: 1000}
+	b := NewBalance()
+	b.ActiveCurrentEpoch = big.NewInt(1000)
 	v := []*Validator{
 		{IsPrevEpochAttester: true, CurrentEpochEffectiveBalance: 32, ProposerIndex: proposerIndex, IsSlashed: true},
 	}
@@ -373,7 +390,8 @@ func baseReward(state state.ReadOnlyBeaconState, index primitives.ValidatorIndex
 		return 0, err
 	}
 	effectiveBalance := val.EffectiveBalance()
+	totalBalanceSqrt := new(big.Int).Sqrt(totalBalance).Uint64()
 	baseReward := effectiveBalance * params.BeaconConfig().BaseRewardFactor /
-		math.IntegerSquareRoot(totalBalance) / params.BeaconConfig().BaseRewardsPerEpoch
+		totalBalanceSqrt / params.BeaconConfig().BaseRewardsPerEpoch
 	return baseReward, nil
 }
diff --git a/beacon-chain/core/epoch/precompute/slashing.go b/beacon-chain/core/epoch/precompute/slashing.go
index 03e0cd6ef..0e62cee3b 100644
--- a/beacon-chain/core/epoch/precompute/slashing.go
+++ b/beacon-chain/core/epoch/precompute/slashing.go
@@ -1,12 +1,13 @@
 package precompute
 
 import (
+	"math/big"
+
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/time"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v5/config/params"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/v5/math"
 	ethpb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
 )
 
@@ -23,7 +24,14 @@ func ProcessSlashingsPrecompute(s state.BeaconState, pBal *Balance) error {
 		totalSlashing += slashing
 	}
 
-	minSlashing := math.Min(totalSlashing*params.BeaconConfig().ProportionalSlashingMultiplier, pBal.ActiveCurrentEpoch)
+	minSlashing := pBal.ActiveCurrentEpoch
+	totalSlashingTimesPropSlashMul := new(big.Int).SetUint64(totalSlashing * params.BeaconConfig().ProportionalSlashingMultiplier)
+
+	if totalSlashingTimesPropSlashMul.Cmp(pBal.ActiveCurrentEpoch) == -1 {
+		minSlashing = totalSlashingTimesPropSlashMul
+	} else {
+		minSlashing = pBal.ActiveCurrentEpoch
+	}
 	epochToWithdraw := currentEpoch + exitLength/2
 
 	var hasSlashing bool
@@ -43,15 +51,19 @@ func ProcessSlashingsPrecompute(s state.BeaconState, pBal *Balance) error {
 		return nil
 	}
 
-	increment := params.BeaconConfig().EffectiveBalanceIncrement
+	increment := new(big.Int).SetUint64(params.BeaconConfig().EffectiveBalanceIncrement)
 	validatorFunc := func(idx int, val *ethpb.Validator) (bool, *ethpb.Validator, error) {
 		correctEpoch := epochToWithdraw == val.WithdrawableEpoch
 		if val.Slashed && correctEpoch {
-			penaltyNumerator := val.EffectiveBalance / increment * minSlashing
-			penalty := penaltyNumerator / pBal.ActiveCurrentEpoch * increment
-			if err := helpers.DecreaseBalance(s, primitives.ValidatorIndex(idx), penalty); err != nil {
+			penalty := new(big.Int).SetUint64(val.EffectiveBalance) // valEffectiveBal
+			penalty.Div(penalty, increment)                         // val.EffectiveBalance / increment
+			penalty.Mul(penalty, minSlashing)                       // penaltyNumerator = val.EffectiveBalance / increment * minSlashing
+			penalty.Div(penalty, pBal.ActiveCurrentEpoch)           // penaltyNumerator / pBal.ActiveCurrentEpoch
+			penalty = penalty.Mul(penalty, increment)               // penalty = penaltyNumerator / pBal.ActiveCurrentEpoch * increment
+			if err := helpers.DecreaseBalance(s, primitives.ValidatorIndex(idx), penalty.Uint64()); err != nil {
 				return false, val, err
 			}
+
 			return true, val, nil
 		}
 		return false, val, nil
diff --git a/beacon-chain/core/epoch/precompute/slashing_test.go b/beacon-chain/core/epoch/precompute/slashing_test.go
index 3b8982342..256b25678 100644
--- a/beacon-chain/core/epoch/precompute/slashing_test.go
+++ b/beacon-chain/core/epoch/precompute/slashing_test.go
@@ -2,6 +2,7 @@ package precompute_test
 
 import (
 	"fmt"
+	"math/big"
 	"testing"
 
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/epoch/precompute"
@@ -21,7 +22,8 @@ func TestProcessSlashingsPrecompute_NotSlashedWithSlashedTrue(t *testing.T) {
 		Slashings:  []uint64{0, 1e9},
 	})
 	require.NoError(t, err)
-	pBal := &precompute.Balance{ActiveCurrentEpoch: params.BeaconConfig().MaxEffectiveBalance}
+	pBal := precompute.NewBalance()
+	pBal.ActiveCurrentEpoch = new(big.Int).SetUint64(params.BeaconConfig().MaxEffectiveBalance)
 	require.NoError(t, precompute.ProcessSlashingsPrecompute(s, pBal))
 
 	wanted := params.BeaconConfig().MaxEffectiveBalance
@@ -36,7 +38,8 @@ func TestProcessSlashingsPrecompute_NotSlashedWithSlashedFalse(t *testing.T) {
 		Slashings:  []uint64{0, 1e9},
 	})
 	require.NoError(t, err)
-	pBal := &precompute.Balance{ActiveCurrentEpoch: params.BeaconConfig().MaxEffectiveBalance}
+	pBal := precompute.NewBalance()
+	pBal.ActiveCurrentEpoch = new(big.Int).SetUint64(params.BeaconConfig().MaxEffectiveBalance)
 	require.NoError(t, precompute.ProcessSlashingsPrecompute(s, pBal))
 
 	wanted := params.BeaconConfig().MaxEffectiveBalance
@@ -112,16 +115,16 @@ func TestProcessSlashingsPrecompute_SlashedLess(t *testing.T) {
 
 	for i, tt := range tests {
 		t.Run(fmt.Sprint(i), func(t *testing.T) {
-			ab := uint64(0)
+			ab := big.NewInt(0)
 			for i, b := range tt.state.Balances {
 				// Skip validator 0 since it's slashed
 				if i == 0 {
 					continue
 				}
-				ab += b
+				ab.Add(ab, new(big.Int).SetUint64(b))
 			}
-			pBal := &precompute.Balance{ActiveCurrentEpoch: ab}
-
+			pBal := precompute.NewBalance()
+			pBal.ActiveCurrentEpoch = ab
 			original := proto.Clone(tt.state)
 			state, err := state_native.InitializeFromProtoPhase0(tt.state)
 			require.NoError(t, err)
diff --git a/beacon-chain/core/epoch/precompute/type.go b/beacon-chain/core/epoch/precompute/type.go
index bcd73598e..63df7b2dd 100644
--- a/beacon-chain/core/epoch/precompute/type.go
+++ b/beacon-chain/core/epoch/precompute/type.go
@@ -1,6 +1,10 @@
 package precompute
 
-import "github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
+import (
+	"math/big"
+
+	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
+)
 
 // Validator stores the pre computation of individual validator's attesting records these records
 // consist of attestation votes, block inclusion record. Pre computing and storing such record
@@ -48,20 +52,20 @@ type Validator struct {
 // Pre computing and storing such record is essential for process epoch optimizations.
 type Balance struct {
 	// ActiveCurrentEpoch is the total effective balance of all active validators during current epoch.
-	ActiveCurrentEpoch uint64
+	ActiveCurrentEpoch *big.Int
 	// ActivePrevEpoch is the total effective balance of all active validators during prev epoch.
-	ActivePrevEpoch uint64
+	ActivePrevEpoch *big.Int
 	// CurrentEpochAttested is the total effective balance of all validators who attested during current epoch.
-	CurrentEpochAttested uint64
+	CurrentEpochAttested *big.Int
 	// CurrentEpochTargetAttested is the total effective balance of all validators who attested
 	// for epoch boundary block during current epoch.
-	CurrentEpochTargetAttested uint64
+	CurrentEpochTargetAttested *big.Int
 	// PrevEpochAttested is the total effective balance of all validators who attested during prev epoch.
-	PrevEpochAttested uint64
+	PrevEpochAttested *big.Int
 	// PrevEpochTargetAttested is the total effective balance of all validators who attested
 	// for epoch boundary block during prev epoch.
-	PrevEpochTargetAttested uint64
+	PrevEpochTargetAttested *big.Int
 	// PrevEpochHeadAttested is the total effective balance of all validators who attested
 	// correctly for head block during prev epoch.
-	PrevEpochHeadAttested uint64
+	PrevEpochHeadAttested *big.Int
 }
diff --git a/beacon-chain/core/helpers/rewards_penalties.go b/beacon-chain/core/helpers/rewards_penalties.go
index 1e8cbd54e..b567bfa70 100644
--- a/beacon-chain/core/helpers/rewards_penalties.go
+++ b/beacon-chain/core/helpers/rewards_penalties.go
@@ -2,6 +2,7 @@ package helpers
 
 import (
 	"errors"
+	"math/big"
 
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/cache"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/state"
@@ -25,20 +26,22 @@ var balanceCache = cache.NewEffectiveBalanceCache()
 //	 Math safe up to ~10B ETH, afterwhich this overflows uint64.
 //	 """
 //	 return Gwei(max(EFFECTIVE_BALANCE_INCREMENT, sum([state.validators[index].effective_balance for index in indices])))
-func TotalBalance(state state.ReadOnlyValidators, indices []primitives.ValidatorIndex) uint64 {
-	total := uint64(0)
+func TotalBalance(state state.ReadOnlyValidators, indices []primitives.ValidatorIndex) *big.Int {
+	total := big.NewInt(0)
 
 	for _, idx := range indices {
 		val, err := state.ValidatorAtIndexReadOnly(idx)
 		if err != nil {
 			continue
 		}
-		total += val.EffectiveBalance()
+		effectiveBalance := val.EffectiveBalance()
+		total.Add(total, new(big.Int).SetUint64(effectiveBalance))
 	}
 
 	// EFFECTIVE_BALANCE_INCREMENT is the lower bound for total balance.
-	if total < params.BeaconConfig().EffectiveBalanceIncrement {
-		return params.BeaconConfig().EffectiveBalanceIncrement
+	effectiveBalanceIncrement := new(big.Int).SetUint64(params.BeaconConfig().EffectiveBalanceIncrement)
+	if total.Cmp(effectiveBalanceIncrement) == -1 {
+		return effectiveBalanceIncrement
 	}
 
 	return total
@@ -55,8 +58,9 @@ func TotalBalance(state state.ReadOnlyValidators, indices []primitives.Validator
 //	 Note: ``get_total_balance`` returns ``EFFECTIVE_BALANCE_INCREMENT`` Gwei minimum to avoid divisions by zero.
 //	 """
 //	 return get_total_balance(state, set(get_active_validator_indices(state, get_current_epoch(state))))
-func TotalActiveBalance(s state.ReadOnlyBeaconState) (uint64, error) {
+func TotalActiveBalance(s state.ReadOnlyBeaconState) (*big.Int, error) {
 	bal, err := balanceCache.Get(s)
+	zero := big.NewInt(0)
 	switch {
 	case err == nil:
 		return bal, nil
@@ -64,24 +68,28 @@ func TotalActiveBalance(s state.ReadOnlyBeaconState) (uint64, error) {
 		// Do nothing if we receive a not found error.
 	default:
 		// In the event, we encounter another error we return it.
-		return 0, err
+		return zero, err
 	}
 
-	total := uint64(0)
+	total := big.NewInt(0)
 	epoch := slots.ToEpoch(s.Slot())
 	if err := s.ReadFromEveryValidator(func(idx int, val state.ReadOnlyValidator) error {
 		if IsActiveValidatorUsingTrie(val, epoch) {
-			total += val.EffectiveBalance()
+			effectiveBalance := val.EffectiveBalance()
+			total.Add(total, new(big.Int).SetUint64(effectiveBalance))
 		}
 		return nil
 	}); err != nil {
-		return 0, err
+		return zero, err
 	}
 
 	// Spec defines `EffectiveBalanceIncrement` as min to avoid divisions by zero.
-	total = mathutil.Max(params.BeaconConfig().EffectiveBalanceIncrement, total)
+	effectiveBalanceIncrement := new(big.Int).SetUint64(params.BeaconConfig().EffectiveBalanceIncrement)
+	if effectiveBalanceIncrement.Cmp(total) == 1 {
+		total = effectiveBalanceIncrement
+	}
 	if err := balanceCache.AddTotalEffectiveBalance(s, total); err != nil {
-		return 0, err
+		return zero, err
 	}
 
 	return total, nil
diff --git a/beacon-chain/core/helpers/rewards_penalties_test.go b/beacon-chain/core/helpers/rewards_penalties_test.go
index 4aeeeb739..bc1ce2bd3 100644
--- a/beacon-chain/core/helpers/rewards_penalties_test.go
+++ b/beacon-chain/core/helpers/rewards_penalties_test.go
@@ -25,7 +25,7 @@ func TestTotalBalance_OK(t *testing.T) {
 	balance := TotalBalance(state, []primitives.ValidatorIndex{0, 1, 2, 3})
 	wanted := state.Validators()[0].EffectiveBalance + state.Validators()[1].EffectiveBalance +
 		state.Validators()[2].EffectiveBalance + state.Validators()[3].EffectiveBalance
-	assert.Equal(t, wanted, balance, "Incorrect TotalBalance")
+	assert.Equal(t, wanted, balance.Uint64(), "Incorrect TotalBalance")
 }
 
 func TestTotalBalance_ReturnsEffectiveBalanceIncrement(t *testing.T) {
@@ -36,7 +36,7 @@ func TestTotalBalance_ReturnsEffectiveBalanceIncrement(t *testing.T) {
 
 	balance := TotalBalance(state, []primitives.ValidatorIndex{})
 	wanted := params.BeaconConfig().EffectiveBalanceIncrement
-	assert.Equal(t, wanted, balance, "Incorrect TotalBalance")
+	assert.Equal(t, wanted, balance.Uint64(), "Incorrect TotalBalance")
 }
 
 func TestGetBalance_OK(t *testing.T) {
@@ -78,7 +78,7 @@ func TestTotalActiveBalance(t *testing.T) {
 		require.NoError(t, err)
 		bal, err := TotalActiveBalance(state)
 		require.NoError(t, err)
-		require.Equal(t, uint64(test.vCount)*params.BeaconConfig().MaxEffectiveBalance, bal)
+		require.Equal(t, uint64(test.vCount)*params.BeaconConfig().MaxEffectiveBalance, bal.Uint64())
 	}
 }
 
@@ -101,7 +101,7 @@ func TestTotalActiveBal_ReturnMin(t *testing.T) {
 		require.NoError(t, err)
 		bal, err := TotalActiveBalance(state)
 		require.NoError(t, err)
-		require.Equal(t, params.BeaconConfig().EffectiveBalanceIncrement, bal)
+		require.Equal(t, params.BeaconConfig().EffectiveBalanceIncrement, bal.Uint64())
 	}
 }
 
@@ -125,7 +125,7 @@ func TestTotalActiveBalance_WithCache(t *testing.T) {
 		require.NoError(t, err)
 		bal, err := TotalActiveBalance(state)
 		require.NoError(t, err)
-		require.Equal(t, uint64(test.wantCount)*params.BeaconConfig().MaxEffectiveBalance, bal)
+		require.Equal(t, uint64(test.wantCount)*params.BeaconConfig().MaxEffectiveBalance, bal.Uint64())
 	}
 }
 
diff --git a/beacon-chain/core/helpers/weak_subjectivity.go b/beacon-chain/core/helpers/weak_subjectivity.go
index 111563c25..cb272106b 100644
--- a/beacon-chain/core/helpers/weak_subjectivity.go
+++ b/beacon-chain/core/helpers/weak_subjectivity.go
@@ -5,6 +5,7 @@ import (
 	"encoding/hex"
 	"errors"
 	"fmt"
+	"math/big"
 	"strconv"
 	"strings"
 
@@ -70,11 +71,12 @@ func ComputeWeakSubjectivityPeriod(ctx context.Context, st state.ReadOnlyBeaconS
 	}
 
 	// Average effective balance in the given validator set, in Ether.
-	t, err := TotalActiveBalance(st)
+	total, err := TotalActiveBalance(st)
 	if err != nil {
 		return 0, fmt.Errorf("cannot find total active balance of validators: %w", err)
 	}
-	t = t / N / cfg.GweiPerEth
+	balancePerValidator := new(big.Int).Div(total, new(big.Int).SetUint64(N))
+	t := new(big.Int).Div(balancePerValidator, new(big.Int).SetUint64(cfg.GweiPerEth)).Uint64()
 
 	// Maximum effective balance per validator.
 	T := cfg.MaxEffectiveBalance / cfg.GweiPerEth
diff --git a/beacon-chain/forkchoice/doubly-linked-tree/forkchoice.go b/beacon-chain/forkchoice/doubly-linked-tree/forkchoice.go
index 941d3c47d..93b7f2725 100644
--- a/beacon-chain/forkchoice/doubly-linked-tree/forkchoice.go
+++ b/beacon-chain/forkchoice/doubly-linked-tree/forkchoice.go
@@ -3,6 +3,7 @@ package doublylinkedtree
 import (
 	"context"
 	"fmt"
+	"math/big"
 	"time"
 
 	"github.com/pkg/errors"
@@ -31,6 +32,7 @@ func New() *ForkChoice {
 		prevJustifiedCheckpoint:       &forkchoicetypes.Checkpoint{},
 		finalizedCheckpoint:           &forkchoicetypes.Checkpoint{},
 		proposerBoostRoot:             [32]byte{},
+		committeeWeight:               big.NewInt(0),
 		nodeByRoot:                    make(map[[fieldparams.RootLength]byte]*Node),
 		nodeByPayload:                 make(map[[fieldparams.RootLength]byte]*Node),
 		slashedIndices:                make(map[primitives.ValidatorIndex]bool),
@@ -278,19 +280,19 @@ func (f *ForkChoice) updateBalances() error {
 			continue
 		}
 
-		oldBalance := uint64(0)
-		newBalance := uint64(0)
+		oldBalance := big.NewInt(0)
+		newBalance := big.NewInt(0)
 		// If the validator index did not exist in `f.balances` or
 		// `newBalances` list above, the balance is just 0.
 		if index < len(f.balances) {
-			oldBalance = f.balances[index]
+			oldBalance = new(big.Int).SetUint64(f.balances[index])
 		}
 		if index < len(newBalances) {
-			newBalance = newBalances[index]
+			newBalance = new(big.Int).SetUint64(newBalances[index])
 		}
 
 		// Update only if the validator's balance or vote has changed.
-		if vote.currentRoot != vote.nextRoot || oldBalance != newBalance {
+		if vote.currentRoot != vote.nextRoot || oldBalance.Cmp(newBalance) != 0 {
 			// Ignore the vote if the root is not in fork choice
 			// store, that means we have not seen the block before.
 			nextNode, ok := f.store.nodeByRoot[vote.nextRoot]
@@ -299,7 +301,7 @@ func (f *ForkChoice) updateBalances() error {
 				if nextNode == nil {
 					return errors.Wrap(ErrNilNode, "could not update balances")
 				}
-				nextNode.balance += newBalance
+				nextNode.balance.Add(nextNode.balance, newBalance)
 			}
 
 			currentNode, ok := f.store.nodeByRoot[vote.currentRoot]
@@ -308,7 +310,7 @@ func (f *ForkChoice) updateBalances() error {
 				if currentNode == nil {
 					return errors.Wrap(ErrNilNode, "could not update balances")
 				}
-				if currentNode.balance < oldBalance {
+				if currentNode.balance.Cmp(oldBalance) == -1 {
 					log.WithFields(logrus.Fields{
 						"nodeRoot":                   fmt.Sprintf("%#x", bytesutil.Trunc(vote.currentRoot[:])),
 						"oldBalance":                 oldBalance,
@@ -318,9 +320,9 @@ func (f *ForkChoice) updateBalances() error {
 						"previousProposerBoostRoot":  fmt.Sprintf("%#x", bytesutil.Trunc(f.store.previousProposerBoostRoot[:])),
 						"previousProposerBoostScore": f.store.previousProposerBoostScore,
 					}).Warning("node with invalid balance, setting it to zero")
-					currentNode.balance = 0
+					currentNode.balance = big.NewInt(0)
 				} else {
-					currentNode.balance -= oldBalance
+					currentNode.balance.Sub(currentNode.balance, oldBalance)
 				}
 			}
 		}
@@ -397,10 +399,10 @@ func (f *ForkChoice) InsertSlashedIndex(_ context.Context, index primitives.Vali
 		return
 	}
 
-	if node.balance < f.balances[index] {
-		node.balance = 0
+	if node.balance.Cmp(new(big.Int).SetUint64(f.balances[index])) == -1 {
+		node.balance = big.NewInt(0)
 	} else {
-		node.balance -= f.balances[index]
+		node.balance.Sub(node.balance, new(big.Int).SetUint64(f.balances[index]))
 	}
 }
 
@@ -602,10 +604,10 @@ func (f *ForkChoice) SetBalancesByRooter(handler forkchoice.BalancesByRooter) {
 }
 
 // Weight returns the weight of the given root if found on the store
-func (f *ForkChoice) Weight(root [32]byte) (uint64, error) {
+func (f *ForkChoice) Weight(root [32]byte) (*big.Int, error) {
 	n, ok := f.store.nodeByRoot[root]
 	if !ok || n == nil {
-		return 0, ErrNilNode
+		return big.NewInt(0), ErrNilNode
 	}
 	return n.weight, nil
 }
@@ -617,15 +619,15 @@ func (f *ForkChoice) updateJustifiedBalances(ctx context.Context, root [32]byte)
 		return errors.Wrap(err, "could not get justified balances")
 	}
 	f.justifiedBalances = balances
-	f.store.committeeWeight = 0
+	f.store.committeeWeight = big.NewInt(0)
 	f.numActiveValidators = 0
 	for _, val := range balances {
 		if val > 0 {
-			f.store.committeeWeight += val
+			f.store.committeeWeight.Add(f.store.committeeWeight, new(big.Int).SetUint64(val))
 			f.numActiveValidators++
 		}
 	}
-	f.store.committeeWeight /= uint64(params.BeaconConfig().SlotsPerEpoch)
+	f.store.committeeWeight.Div(f.store.committeeWeight, new(big.Int).SetUint64(uint64(params.BeaconConfig().SlotsPerEpoch)))
 	return nil
 }
 
diff --git a/beacon-chain/forkchoice/doubly-linked-tree/forkchoice_test.go b/beacon-chain/forkchoice/doubly-linked-tree/forkchoice_test.go
index 62472e288..074e92835 100644
--- a/beacon-chain/forkchoice/doubly-linked-tree/forkchoice_test.go
+++ b/beacon-chain/forkchoice/doubly-linked-tree/forkchoice_test.go
@@ -3,6 +3,7 @@ package doublylinkedtree
 import (
 	"context"
 	"encoding/binary"
+	"math/big"
 	"testing"
 	"time"
 
@@ -85,9 +86,9 @@ func TestForkChoice_UpdateBalancesPositiveChange(t *testing.T) {
 	f.justifiedBalances = []uint64{10, 20, 30}
 	require.NoError(t, f.updateBalances())
 	s := f.store
-	assert.Equal(t, uint64(10), s.nodeByRoot[indexToHash(1)].balance)
-	assert.Equal(t, uint64(20), s.nodeByRoot[indexToHash(2)].balance)
-	assert.Equal(t, uint64(30), s.nodeByRoot[indexToHash(3)].balance)
+	assert.Equal(t, uint64(10), s.nodeByRoot[indexToHash(1)].balance.Uint64())
+	assert.Equal(t, uint64(20), s.nodeByRoot[indexToHash(2)].balance.Uint64())
+	assert.Equal(t, uint64(30), s.nodeByRoot[indexToHash(3)].balance.Uint64())
 }
 
 func TestForkChoice_UpdateBalancesNegativeChange(t *testing.T) {
@@ -103,9 +104,9 @@ func TestForkChoice_UpdateBalancesNegativeChange(t *testing.T) {
 	require.NoError(t, err)
 	require.NoError(t, f.InsertNode(ctx, st, blkRoot))
 	s := f.store
-	s.nodeByRoot[indexToHash(1)].balance = 100
-	s.nodeByRoot[indexToHash(2)].balance = 100
-	s.nodeByRoot[indexToHash(3)].balance = 100
+	s.nodeByRoot[indexToHash(1)].balance = big.NewInt(100)
+	s.nodeByRoot[indexToHash(2)].balance = big.NewInt(100)
+	s.nodeByRoot[indexToHash(3)].balance = big.NewInt(100)
 
 	f.balances = []uint64{100, 100, 100}
 	f.votes = []Vote{
@@ -116,9 +117,9 @@ func TestForkChoice_UpdateBalancesNegativeChange(t *testing.T) {
 
 	f.justifiedBalances = []uint64{10, 20, 30}
 	require.NoError(t, f.updateBalances())
-	assert.Equal(t, uint64(10), s.nodeByRoot[indexToHash(1)].balance)
-	assert.Equal(t, uint64(20), s.nodeByRoot[indexToHash(2)].balance)
-	assert.Equal(t, uint64(30), s.nodeByRoot[indexToHash(3)].balance)
+	assert.Equal(t, uint64(10), s.nodeByRoot[indexToHash(1)].balance.Uint64())
+	assert.Equal(t, uint64(20), s.nodeByRoot[indexToHash(2)].balance.Uint64())
+	assert.Equal(t, uint64(30), s.nodeByRoot[indexToHash(3)].balance.Uint64())
 }
 
 func TestForkChoice_UpdateBalancesUnderflow(t *testing.T) {
@@ -134,9 +135,9 @@ func TestForkChoice_UpdateBalancesUnderflow(t *testing.T) {
 	require.NoError(t, err)
 	require.NoError(t, f.InsertNode(ctx, st, blkRoot))
 	s := f.store
-	s.nodeByRoot[indexToHash(1)].balance = 100
-	s.nodeByRoot[indexToHash(2)].balance = 100
-	s.nodeByRoot[indexToHash(3)].balance = 100
+	s.nodeByRoot[indexToHash(1)].balance = big.NewInt(100)
+	s.nodeByRoot[indexToHash(2)].balance = big.NewInt(100)
+	s.nodeByRoot[indexToHash(3)].balance = big.NewInt(100)
 
 	f.balances = []uint64{125, 125, 125}
 	f.votes = []Vote{
@@ -147,9 +148,9 @@ func TestForkChoice_UpdateBalancesUnderflow(t *testing.T) {
 
 	f.justifiedBalances = []uint64{10, 20, 30}
 	require.NoError(t, f.updateBalances())
-	assert.Equal(t, uint64(0), s.nodeByRoot[indexToHash(1)].balance)
-	assert.Equal(t, uint64(0), s.nodeByRoot[indexToHash(2)].balance)
-	assert.Equal(t, uint64(5), s.nodeByRoot[indexToHash(3)].balance)
+	assert.Equal(t, uint64(0), s.nodeByRoot[indexToHash(1)].balance.Uint64())
+	assert.Equal(t, uint64(0), s.nodeByRoot[indexToHash(2)].balance.Uint64())
+	assert.Equal(t, uint64(5), s.nodeByRoot[indexToHash(3)].balance.Uint64())
 }
 
 func TestForkChoice_IsCanonical(t *testing.T) {
@@ -205,10 +206,10 @@ func TestForkChoice_IsCanonicalReorg(t *testing.T) {
 	require.NoError(t, err)
 	require.NoError(t, f.InsertNode(ctx, st, blkRoot))
 
-	f.store.nodeByRoot[[32]byte{'3'}].balance = 10
+	f.store.nodeByRoot[[32]byte{'3'}].balance = big.NewInt(10)
 	require.NoError(t, f.store.treeRootNode.applyWeightChanges(ctx))
-	require.Equal(t, uint64(10), f.store.nodeByRoot[[32]byte{'1'}].weight)
-	require.Equal(t, uint64(0), f.store.nodeByRoot[[32]byte{'2'}].weight)
+	require.Equal(t, uint64(10), f.store.nodeByRoot[[32]byte{'1'}].weight.Uint64())
+	require.Equal(t, uint64(0), f.store.nodeByRoot[[32]byte{'2'}].weight.Uint64())
 
 	require.NoError(t, f.store.treeRootNode.updateBestDescendant(ctx, 1, 1, 1))
 	require.DeepEqual(t, [32]byte{'3'}, f.store.treeRootNode.bestDescendant.root)
@@ -323,21 +324,21 @@ func TestForkChoice_RemoveEquivocating(t *testing.T) {
 
 	// Process b's slashing, c is now head
 	f.InsertSlashedIndex(ctx, 1)
-	require.Equal(t, uint64(200), f.store.nodeByRoot[[32]byte{'b'}].balance)
+	require.Equal(t, uint64(200), f.store.nodeByRoot[[32]byte{'b'}].balance.Uint64())
 	f.justifiedBalances = []uint64{100, 200, 200, 300}
 	head, err = f.Head(ctx)
-	require.Equal(t, uint64(200), f.store.nodeByRoot[[32]byte{'b'}].weight)
-	require.Equal(t, uint64(300), f.store.nodeByRoot[[32]byte{'c'}].weight)
+	require.Equal(t, uint64(200), f.store.nodeByRoot[[32]byte{'b'}].weight.Uint64())
+	require.Equal(t, uint64(300), f.store.nodeByRoot[[32]byte{'c'}].weight.Uint64())
 	require.NoError(t, err)
 	require.Equal(t, [32]byte{'c'}, head)
 
 	// Process b's slashing again, should be a noop
 	f.InsertSlashedIndex(ctx, 1)
-	require.Equal(t, uint64(200), f.store.nodeByRoot[[32]byte{'b'}].balance)
+	require.Equal(t, uint64(200), f.store.nodeByRoot[[32]byte{'b'}].balance.Uint64())
 	f.justifiedBalances = []uint64{100, 200, 200, 300}
 	head, err = f.Head(ctx)
-	require.Equal(t, uint64(200), f.store.nodeByRoot[[32]byte{'b'}].weight)
-	require.Equal(t, uint64(300), f.store.nodeByRoot[[32]byte{'c'}].weight)
+	require.Equal(t, uint64(200), f.store.nodeByRoot[[32]byte{'b'}].weight.Uint64())
+	require.Equal(t, uint64(300), f.store.nodeByRoot[[32]byte{'c'}].weight.Uint64())
 	require.NoError(t, err)
 	require.Equal(t, [32]byte{'c'}, head)
 
@@ -720,14 +721,14 @@ func TestWeight(t *testing.T) {
 
 	n, ok := f.store.nodeByRoot[root]
 	require.Equal(t, true, ok)
-	n.weight = 10
+	n.weight = big.NewInt(10)
 	w, err := f.Weight(root)
 	require.NoError(t, err)
-	require.Equal(t, uint64(10), w)
+	require.Equal(t, uint64(10), w.Uint64())
 
 	w, err = f.Weight([32]byte{'b'})
 	require.ErrorIs(t, err, ErrNilNode)
-	require.Equal(t, uint64(0), w)
+	require.Equal(t, uint64(0), w.Uint64())
 }
 
 func TestForkchoice_UpdateJustifiedBalances(t *testing.T) {
@@ -738,7 +739,7 @@ func TestForkchoice_UpdateJustifiedBalances(t *testing.T) {
 	}
 	require.NoError(t, f.updateJustifiedBalances(context.Background(), [32]byte{}))
 	require.Equal(t, uint64(7), f.numActiveValidators)
-	require.Equal(t, uint64(430)/32, f.store.committeeWeight)
+	require.Equal(t, uint64(430)/32, f.store.committeeWeight.Uint64())
 	require.DeepEqual(t, balances, f.justifiedBalances)
 }
 
diff --git a/beacon-chain/forkchoice/doubly-linked-tree/node.go b/beacon-chain/forkchoice/doubly-linked-tree/node.go
index 2c4253b43..54b4d2815 100644
--- a/beacon-chain/forkchoice/doubly-linked-tree/node.go
+++ b/beacon-chain/forkchoice/doubly-linked-tree/node.go
@@ -3,6 +3,7 @@ package doublylinkedtree
 import (
 	"bytes"
 	"context"
+	"math/big"
 
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v5/config/params"
@@ -19,7 +20,7 @@ const ProcessAttestationsThreshold = 10
 // using the current balance stored in each node.
 func (n *Node) applyWeightChanges(ctx context.Context) error {
 	// Recursively calling the children to sum their weights.
-	childrenWeight := uint64(0)
+	childrenWeight := big.NewInt(0)
 	for _, child := range n.children {
 		if ctx.Err() != nil {
 			return ctx.Err()
@@ -27,12 +28,12 @@ func (n *Node) applyWeightChanges(ctx context.Context) error {
 		if err := child.applyWeightChanges(ctx); err != nil {
 			return err
 		}
-		childrenWeight += child.weight
+		childrenWeight.Add(childrenWeight, child.weight)
 	}
 	if n.root == params.BeaconConfig().ZeroHash {
 		return nil
 	}
-	n.weight = n.balance + childrenWeight
+	n.weight.Add(n.balance, childrenWeight)
 	return nil
 }
 
@@ -48,7 +49,7 @@ func (n *Node) updateBestDescendant(ctx context.Context, justifiedEpoch, finaliz
 	}
 
 	var bestChild *Node
-	bestWeight := uint64(0)
+	bestWeight := big.NewInt(0)
 	hasViableDescendant := false
 	for _, child := range n.children {
 		if child == nil {
@@ -66,12 +67,12 @@ func (n *Node) updateBestDescendant(ctx context.Context, justifiedEpoch, finaliz
 			hasViableDescendant = true
 		} else if childLeadsToViableHead {
 			// If both are viable, compare their weights.
-			if child.weight == bestWeight {
+			if child.weight.Cmp(bestWeight) == 0 {
 				// Tie-breaker of equal weights by root.
 				if bytes.Compare(child.root[:], bestChild.root[:]) > 0 {
 					bestChild = child
 				}
-			} else if child.weight > bestWeight {
+			} else if child.weight.Cmp(bestWeight) == 1 {
 				bestChild = child
 				bestWeight = child.weight
 			}
diff --git a/beacon-chain/forkchoice/doubly-linked-tree/node_test.go b/beacon-chain/forkchoice/doubly-linked-tree/node_test.go
index 66bd0e607..27270941c 100644
--- a/beacon-chain/forkchoice/doubly-linked-tree/node_test.go
+++ b/beacon-chain/forkchoice/doubly-linked-tree/node_test.go
@@ -2,6 +2,7 @@ package doublylinkedtree
 
 import (
 	"context"
+	"math/big"
 	"testing"
 
 	"github.com/prysmaticlabs/prysm/v5/config/params"
@@ -27,15 +28,15 @@ func TestNode_ApplyWeightChanges_PositiveChange(t *testing.T) {
 	// The updated balances of each node is 100
 	s := f.store
 
-	s.nodeByRoot[indexToHash(1)].balance = 100
-	s.nodeByRoot[indexToHash(2)].balance = 100
-	s.nodeByRoot[indexToHash(3)].balance = 100
+	s.nodeByRoot[indexToHash(1)].balance = big.NewInt(100)
+	s.nodeByRoot[indexToHash(2)].balance = big.NewInt(100)
+	s.nodeByRoot[indexToHash(3)].balance = big.NewInt(100)
 
 	assert.NoError(t, s.treeRootNode.applyWeightChanges(ctx))
 
-	assert.Equal(t, uint64(300), s.nodeByRoot[indexToHash(1)].weight)
-	assert.Equal(t, uint64(200), s.nodeByRoot[indexToHash(2)].weight)
-	assert.Equal(t, uint64(100), s.nodeByRoot[indexToHash(3)].weight)
+	assert.Equal(t, uint64(300), s.nodeByRoot[indexToHash(1)].weight.Uint64())
+	assert.Equal(t, uint64(200), s.nodeByRoot[indexToHash(2)].weight.Uint64())
+	assert.Equal(t, uint64(100), s.nodeByRoot[indexToHash(3)].weight.Uint64())
 }
 
 func TestNode_ApplyWeightChanges_NegativeChange(t *testing.T) {
@@ -53,19 +54,19 @@ func TestNode_ApplyWeightChanges_NegativeChange(t *testing.T) {
 
 	// The updated balances of each node is 100
 	s := f.store
-	s.nodeByRoot[indexToHash(1)].weight = 400
-	s.nodeByRoot[indexToHash(2)].weight = 400
-	s.nodeByRoot[indexToHash(3)].weight = 400
+	s.nodeByRoot[indexToHash(1)].weight = big.NewInt(400)
+	s.nodeByRoot[indexToHash(2)].weight = big.NewInt(400)
+	s.nodeByRoot[indexToHash(3)].weight = big.NewInt(400)
 
-	s.nodeByRoot[indexToHash(1)].balance = 100
-	s.nodeByRoot[indexToHash(2)].balance = 100
-	s.nodeByRoot[indexToHash(3)].balance = 100
+	s.nodeByRoot[indexToHash(1)].balance = big.NewInt(100)
+	s.nodeByRoot[indexToHash(2)].balance = big.NewInt(100)
+	s.nodeByRoot[indexToHash(3)].balance = big.NewInt(100)
 
 	assert.NoError(t, s.treeRootNode.applyWeightChanges(ctx))
 
-	assert.Equal(t, uint64(300), s.nodeByRoot[indexToHash(1)].weight)
-	assert.Equal(t, uint64(200), s.nodeByRoot[indexToHash(2)].weight)
-	assert.Equal(t, uint64(100), s.nodeByRoot[indexToHash(3)].weight)
+	assert.Equal(t, uint64(300), s.nodeByRoot[indexToHash(1)].weight.Uint64())
+	assert.Equal(t, uint64(200), s.nodeByRoot[indexToHash(2)].weight.Uint64())
+	assert.Equal(t, uint64(100), s.nodeByRoot[indexToHash(3)].weight.Uint64())
 }
 
 func TestNode_UpdateBestDescendant_NonViableChild(t *testing.T) {
@@ -108,8 +109,8 @@ func TestNode_UpdateBestDescendant_HigherWeightChild(t *testing.T) {
 	require.NoError(t, f.InsertNode(ctx, state, blkRoot))
 
 	s := f.store
-	s.nodeByRoot[indexToHash(1)].weight = 100
-	s.nodeByRoot[indexToHash(2)].weight = 200
+	s.nodeByRoot[indexToHash(1)].weight = big.NewInt(100)
+	s.nodeByRoot[indexToHash(2)].weight = big.NewInt(200)
 	assert.NoError(t, s.treeRootNode.updateBestDescendant(ctx, 1, 1, 1))
 
 	assert.Equal(t, 2, len(s.treeRootNode.children))
@@ -128,8 +129,8 @@ func TestNode_UpdateBestDescendant_LowerWeightChild(t *testing.T) {
 	require.NoError(t, f.InsertNode(ctx, state, blkRoot))
 
 	s := f.store
-	s.nodeByRoot[indexToHash(1)].weight = 200
-	s.nodeByRoot[indexToHash(2)].weight = 100
+	s.nodeByRoot[indexToHash(1)].weight = big.NewInt(200)
+	s.nodeByRoot[indexToHash(2)].weight = big.NewInt(100)
 	assert.NoError(t, s.treeRootNode.updateBestDescendant(ctx, 1, 1, 1))
 
 	assert.Equal(t, 2, len(s.treeRootNode.children))
diff --git a/beacon-chain/forkchoice/doubly-linked-tree/proposer_boost.go b/beacon-chain/forkchoice/doubly-linked-tree/proposer_boost.go
index 0ebbd83de..c03905831 100644
--- a/beacon-chain/forkchoice/doubly-linked-tree/proposer_boost.go
+++ b/beacon-chain/forkchoice/doubly-linked-tree/proposer_boost.go
@@ -2,6 +2,7 @@ package doublylinkedtree
 
 import (
 	"fmt"
+	"math/big"
 
 	fieldparams "github.com/prysmaticlabs/prysm/v5/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/v5/config/params"
@@ -11,13 +12,13 @@ import (
 // relevant nodes.
 func (f *ForkChoice) applyProposerBoostScore() error {
 	s := f.store
-	proposerScore := uint64(0)
+	proposerScore := big.NewInt(0)
 	if s.previousProposerBoostRoot != params.BeaconConfig().ZeroHash {
 		previousNode, ok := s.nodeByRoot[s.previousProposerBoostRoot]
 		if !ok || previousNode == nil {
 			log.WithError(errInvalidProposerBoostRoot).Errorf(fmt.Sprintf("invalid prev root %#x", s.previousProposerBoostRoot))
 		} else {
-			previousNode.balance -= s.previousProposerBoostScore
+			previousNode.balance.Sub(previousNode.balance, new(big.Int).SetUint64(s.previousProposerBoostScore))
 		}
 	}
 
@@ -26,12 +27,13 @@ func (f *ForkChoice) applyProposerBoostScore() error {
 		if !ok || currentNode == nil {
 			log.WithError(errInvalidProposerBoostRoot).Errorf(fmt.Sprintf("invalid current root %#x", s.proposerBoostRoot))
 		} else {
-			proposerScore = (s.committeeWeight * params.BeaconConfig().ProposerScoreBoost) / 100
-			currentNode.balance += proposerScore
+			proposerScore = new(big.Int).Mul(s.committeeWeight, new(big.Int).SetUint64(params.BeaconConfig().ProposerScoreBoost))
+			proposerScore.Div(proposerScore, big.NewInt(100))
+			currentNode.balance.Add(currentNode.balance, proposerScore)
 		}
 	}
 	s.previousProposerBoostRoot = s.proposerBoostRoot
-	s.previousProposerBoostScore = proposerScore
+	s.previousProposerBoostScore = proposerScore.Uint64()
 	return nil
 }
 
diff --git a/beacon-chain/forkchoice/doubly-linked-tree/proposer_boost_test.go b/beacon-chain/forkchoice/doubly-linked-tree/proposer_boost_test.go
index 28b1be753..8eecd7689 100644
--- a/beacon-chain/forkchoice/doubly-linked-tree/proposer_boost_test.go
+++ b/beacon-chain/forkchoice/doubly-linked-tree/proposer_boost_test.go
@@ -2,6 +2,7 @@ package doublylinkedtree
 
 import (
 	"context"
+	"math/big"
 	"testing"
 	"time"
 
@@ -34,7 +35,7 @@ func TestForkChoice_BoostProposerRoot_PreventsExAnteAttack(t *testing.T) {
 	t.Run("back-propagates boost score to ancestors after proposer boosting", func(t *testing.T) {
 		f := setup(jEpoch, fEpoch)
 		f.justifiedBalances = balances
-		f.store.committeeWeight = uint64(len(balances)*10) / uint64(params.BeaconConfig().SlotsPerEpoch)
+		f.store.committeeWeight = new(big.Int).SetUint64(uint64(len(balances)*10) / uint64(params.BeaconConfig().SlotsPerEpoch))
 		f.numActiveValidators = uint64(len(balances))
 
 		// The head should always start at the finalized block.
@@ -154,7 +155,7 @@ func TestForkChoice_BoostProposerRoot_PreventsExAnteAttack(t *testing.T) {
 
 		// Expect nodes to have a boosted, back-propagated score.
 		// Ancestors have the added weights of their children. Genesis is a special exception at 0 weight,
-		require.Equal(t, f.store.treeRootNode.weight, uint64(0))
+		require.Equal(t, f.store.treeRootNode.weight.Uint64(), uint64(0))
 
 		// Proposer boost score with these test parameters is 8
 		// Each of the nodes received one attestation accounting for 10.
@@ -164,13 +165,13 @@ func TestForkChoice_BoostProposerRoot_PreventsExAnteAttack(t *testing.T) {
 		//		    \--------------->(4: 18)
 		//
 		node1 := f.store.nodeByRoot[indexToHash(1)]
-		require.Equal(t, node1.weight, uint64(48))
+		require.Equal(t, node1.weight.Uint64(), uint64(48))
 		node2 := f.store.nodeByRoot[indexToHash(2)]
-		require.Equal(t, node2.weight, uint64(38))
+		require.Equal(t, node2.weight.Uint64(), uint64(38))
 		node3 := f.store.nodeByRoot[indexToHash(3)]
-		require.Equal(t, node3.weight, uint64(10))
+		require.Equal(t, node3.weight.Uint64(), uint64(10))
 		node4 := f.store.nodeByRoot[indexToHash(4)]
-		require.Equal(t, node4.weight, uint64(18))
+		require.Equal(t, node4.weight.Uint64(), uint64(18))
 
 		// Regression: process attestations for C, check that it
 		// becomes head, we need two attestations to have C.weight = 30 > 24 = D.weight
@@ -327,7 +328,7 @@ func TestForkChoice_BoostProposerRoot_PreventsExAnteAttack(t *testing.T) {
 		//	Block D received at N+3 — D is head
 		f := setup(jEpoch, fEpoch)
 		f.justifiedBalances = balances
-		f.store.committeeWeight = uint64(len(balances)*10) / uint64(params.BeaconConfig().SlotsPerEpoch)
+		f.store.committeeWeight = new(big.Int).SetUint64(uint64(len(balances)*10) / uint64(params.BeaconConfig().SlotsPerEpoch))
 		f.numActiveValidators = uint64(len(balances))
 		a := zeroHash
 
diff --git a/beacon-chain/forkchoice/doubly-linked-tree/reorg_late_blocks.go b/beacon-chain/forkchoice/doubly-linked-tree/reorg_late_blocks.go
index 8bc717802..78d25e2b6 100644
--- a/beacon-chain/forkchoice/doubly-linked-tree/reorg_late_blocks.go
+++ b/beacon-chain/forkchoice/doubly-linked-tree/reorg_late_blocks.go
@@ -1,6 +1,7 @@
 package doublylinkedtree
 
 import (
+	"math/big"
 	"time"
 
 	"github.com/prysmaticlabs/prysm/v5/config/params"
@@ -78,7 +79,7 @@ func (f *ForkChoice) ShouldOverrideFCU() (override bool) {
 	// }
 
 	// Only orphan a block if the head LMD vote is weak
-	if head.weight*100 > f.store.committeeWeight*params.BeaconConfig().ReorgWeightThreshold {
+	if f.headVoteIsStrong() {
 		return
 	}
 
@@ -92,7 +93,7 @@ func (f *ForkChoice) ShouldOverrideFCU() (override bool) {
 		return true
 	}
 	// Only orphan a block if the parent LMD vote is strong
-	if parent.weight*100 < f.store.committeeWeight*params.BeaconConfig().ReorgParentWeightThreshold {
+	if f.parentVoteIsWeak() {
 		return
 	}
 	return true
@@ -143,12 +144,12 @@ func (f *ForkChoice) GetProposerHead() [32]byte {
 	}
 
 	// Only orphan a block if the head LMD vote is weak
-	if head.weight*100 > f.store.committeeWeight*params.BeaconConfig().ReorgWeightThreshold {
+	if f.headVoteIsStrong() {
 		return head.root
 	}
 
 	// Only orphan a block if the parent LMD vote is strong
-	if parent.weight*100 < f.store.committeeWeight*params.BeaconConfig().ReorgParentWeightThreshold {
+	if f.parentVoteIsWeak() {
 		return head.root
 	}
 
@@ -163,3 +164,25 @@ func (f *ForkChoice) GetProposerHead() [32]byte {
 	}
 	return parent.root
 }
+
+// headVoteIsStrong returns true if the head LMD vote is explicitly above the threshold.
+func (f *ForkChoice) headVoteIsStrong() bool {
+	// This function replaces the following upstream code, using big.Int:
+	// head.weight*100 > f.store.committeeWeight*params.BeaconConfig().ReorgWeightThreshold
+	head := f.store.headNode
+	scaledHeadWeight := new(big.Int).Mul(head.weight, big.NewInt(100))
+	threshold := new(big.Int).SetUint64(params.BeaconConfig().ReorgWeightThreshold)
+	threshold.Mul(threshold, f.store.committeeWeight)
+	return scaledHeadWeight.Cmp(threshold) == 1
+}
+
+// parentVoteIsWeak returns true if the parent LMD vote is explicitly below the threshold.
+func (f *ForkChoice) parentVoteIsWeak() bool {
+	// This function replaces the following upstream code, using big.Int:
+	// parent.weight*100 < f.store.committeeWeight*params.BeaconConfig().ReorgParentWeightThreshold
+	parent := f.store.headNode.parent
+	scaledParentWeight := new(big.Int).Mul(parent.weight, big.NewInt(100))
+	threshold := new(big.Int).SetUint64(params.BeaconConfig().ReorgParentWeightThreshold)
+	threshold.Mul(threshold, f.store.committeeWeight)
+	return scaledParentWeight.Cmp(threshold) == -1
+}
diff --git a/beacon-chain/forkchoice/doubly-linked-tree/reorg_late_blocks_test.go b/beacon-chain/forkchoice/doubly-linked-tree/reorg_late_blocks_test.go
index dd6694aed..bedee1d56 100644
--- a/beacon-chain/forkchoice/doubly-linked-tree/reorg_late_blocks_test.go
+++ b/beacon-chain/forkchoice/doubly-linked-tree/reorg_late_blocks_test.go
@@ -2,6 +2,7 @@ package doublylinkedtree
 
 import (
 	"context"
+	"math/big"
 	"testing"
 
 	"github.com/prysmaticlabs/prysm/v5/config/params"
@@ -14,9 +15,9 @@ func TestForkChoice_ShouldOverrideFCU(t *testing.T) {
 	f.justifiedBalances = make([]uint64, f.numActiveValidators)
 	for i := range f.justifiedBalances {
 		f.justifiedBalances[i] = uint64(10)
-		f.store.committeeWeight += uint64(10)
+		f.store.committeeWeight.Add(f.store.committeeWeight, big.NewInt(10))
 	}
-	f.store.committeeWeight /= uint64(params.BeaconConfig().SlotsPerEpoch)
+	f.store.committeeWeight.Div(f.store.committeeWeight, new(big.Int).SetUint64(uint64(params.BeaconConfig().SlotsPerEpoch)))
 	ctx := context.Background()
 	driftGenesisTime(f, 1, 0)
 	st, root, err := prepareForkchoiceState(ctx, 1, [32]byte{'a'}, [32]byte{}, [32]byte{'A'}, 0, 0)
@@ -87,14 +88,14 @@ func TestForkChoice_ShouldOverrideFCU(t *testing.T) {
 	})
 	t.Run("parent is weak early call", func(t *testing.T) {
 		saved := f.store.headNode.parent.weight
-		f.store.headNode.parent.weight = 0
+		f.store.headNode.parent.weight = big.NewInt(0)
 		require.Equal(t, true, f.ShouldOverrideFCU())
 		f.store.headNode.parent.weight = saved
 	})
 	t.Run("parent is weak late call", func(t *testing.T) {
 		saved := f.store.headNode.parent.weight
 		driftGenesisTime(f, 2, 11)
-		f.store.headNode.parent.weight = 0
+		f.store.headNode.parent.weight = big.NewInt(0)
 		require.Equal(t, false, f.ShouldOverrideFCU())
 		f.store.headNode.parent.weight = saved
 		driftGenesisTime(f, 2, orphanLateBlockFirstThreshold+1)
@@ -111,9 +112,9 @@ func TestForkChoice_GetProposerHead(t *testing.T) {
 	f.justifiedBalances = make([]uint64, f.numActiveValidators)
 	for i := range f.justifiedBalances {
 		f.justifiedBalances[i] = uint64(10)
-		f.store.committeeWeight += uint64(10)
+		f.store.committeeWeight.Add(f.store.committeeWeight, big.NewInt(10))
 	}
-	f.store.committeeWeight /= uint64(params.BeaconConfig().SlotsPerEpoch)
+	f.store.committeeWeight.Div(f.store.committeeWeight, new(big.Int).SetUint64(uint64(params.BeaconConfig().SlotsPerEpoch)))
 	ctx := context.Background()
 	driftGenesisTime(f, 1, 0)
 	parentRoot := [32]byte{'a'}
@@ -187,7 +188,7 @@ func TestForkChoice_GetProposerHead(t *testing.T) {
 	})
 	t.Run("parent is weak", func(t *testing.T) {
 		saved := f.store.headNode.parent.weight
-		f.store.headNode.parent.weight = 0
+		f.store.headNode.parent.weight = big.NewInt(0)
 		require.Equal(t, false, f.ShouldOverrideFCU())
 		f.store.headNode.parent.weight = saved
 	})
diff --git a/beacon-chain/forkchoice/doubly-linked-tree/store.go b/beacon-chain/forkchoice/doubly-linked-tree/store.go
index 23b58a058..821cf8559 100644
--- a/beacon-chain/forkchoice/doubly-linked-tree/store.go
+++ b/beacon-chain/forkchoice/doubly-linked-tree/store.go
@@ -3,6 +3,7 @@ package doublylinkedtree
 import (
 	"context"
 	"fmt"
+	"math/big"
 	"time"
 
 	"github.com/pkg/errors"
@@ -45,8 +46,10 @@ func (s *Store) head(ctx context.Context) ([32]byte, error) {
 	currentEpoch := slots.EpochsSinceGenesis(time.Unix(int64(s.genesisTime), 0))
 	if !bestDescendant.viableForHead(s.justifiedCheckpoint.Epoch, currentEpoch) {
 		s.allTipsAreInvalid = true
+		weight := big.NewInt(10e9)
+		weight.Div(bestDescendant.weight, weight)
 		return [32]byte{}, fmt.Errorf("head at slot %d with weight %d is not eligible, finalizedEpoch, justified Epoch %d, %d != %d, %d",
-			bestDescendant.slot, bestDescendant.weight/10e9, bestDescendant.finalizedEpoch, bestDescendant.justifiedEpoch, s.finalizedCheckpoint.Epoch, s.justifiedCheckpoint.Epoch)
+			bestDescendant.slot, weight, bestDescendant.finalizedEpoch, bestDescendant.justifiedEpoch, s.finalizedCheckpoint.Epoch, s.justifiedCheckpoint.Epoch)
 	}
 	s.allTipsAreInvalid = false
 
@@ -85,6 +88,8 @@ func (s *Store) insert(ctx context.Context,
 		unrealizedFinalizedEpoch: finalizedEpoch,
 		optimistic:               true,
 		payloadHash:              payloadHash,
+		balance:                  big.NewInt(0),
+		weight:                   big.NewInt(0),
 		timestamp:                uint64(time.Now().Unix()),
 	}
 
diff --git a/beacon-chain/forkchoice/doubly-linked-tree/types.go b/beacon-chain/forkchoice/doubly-linked-tree/types.go
index ad5bffa79..82b88b315 100644
--- a/beacon-chain/forkchoice/doubly-linked-tree/types.go
+++ b/beacon-chain/forkchoice/doubly-linked-tree/types.go
@@ -1,6 +1,7 @@
 package doublylinkedtree
 
 import (
+	"math/big"
 	"sync"
 
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/forkchoice"
@@ -30,7 +31,7 @@ type Store struct {
 	proposerBoostRoot             [fieldparams.RootLength]byte           // latest block root that was boosted after being received in a timely manner.
 	previousProposerBoostRoot     [fieldparams.RootLength]byte           // previous block root that was boosted after being received in a timely manner.
 	previousProposerBoostScore    uint64                                 // previous proposer boosted root score.
-	committeeWeight               uint64                                 // tracks the total active validator balance divided by the number of slots per Epoch.
+	committeeWeight               *big.Int                               // tracks the total active validator balance divided by the number of slots per Epoch.
 	treeRootNode                  *Node                                  // the root node of the store tree.
 	headNode                      *Node                                  // last head Node
 	nodeByRoot                    map[[fieldparams.RootLength]byte]*Node // nodes indexed by roots.
@@ -56,8 +57,8 @@ type Node struct {
 	unrealizedJustifiedEpoch primitives.Epoch             // the epoch that would be justified if the block would be advanced to the next epoch.
 	finalizedEpoch           primitives.Epoch             // finalizedEpoch of this node.
 	unrealizedFinalizedEpoch primitives.Epoch             // the epoch that would be finalized if the block would be advanced to the next epoch.
-	balance                  uint64                       // the balance that voted for this node directly
-	weight                   uint64                       // weight of this node: the total balance including children
+	balance                  *big.Int                     // the balance that voted for this node directly
+	weight                   *big.Int                     // weight of this node: the total balance including children
 	bestDescendant           *Node                        // bestDescendant node of this node.
 	optimistic               bool                         // whether the block has been fully validated or not
 	timestamp                uint64                       // The timestamp when the node was inserted.
diff --git a/beacon-chain/forkchoice/doubly-linked-tree/unrealized_justification_test.go b/beacon-chain/forkchoice/doubly-linked-tree/unrealized_justification_test.go
index bddf0fe7c..9d0776b0e 100644
--- a/beacon-chain/forkchoice/doubly-linked-tree/unrealized_justification_test.go
+++ b/beacon-chain/forkchoice/doubly-linked-tree/unrealized_justification_test.go
@@ -99,8 +99,8 @@ func TestStore_LongFork(t *testing.T) {
 	headRoot, err = f.Head(ctx)
 	require.NoError(t, err)
 	require.Equal(t, [32]byte{'c'}, headRoot)
-	require.Equal(t, uint64(0), f.store.nodeByRoot[[32]byte{'d'}].weight)
-	require.Equal(t, uint64(100), f.store.nodeByRoot[[32]byte{'c'}].weight)
+	require.Equal(t, uint64(0), f.store.nodeByRoot[[32]byte{'d'}].weight.Uint64())
+	require.Equal(t, uint64(100), f.store.nodeByRoot[[32]byte{'c'}].weight.Uint64())
 }
 
 //	Epoch 1                Epoch 2               Epoch 3
@@ -244,8 +244,8 @@ func TestStore_ForkNextEpoch(t *testing.T) {
 	require.NoError(t, err)
 	require.Equal(t, [32]byte{'d'}, headRoot)
 	require.Equal(t, primitives.Epoch(2), f.JustifiedCheckpoint().Epoch)
-	require.Equal(t, uint64(0), f.store.nodeByRoot[[32]byte{'d'}].weight)
-	require.Equal(t, uint64(100), f.store.nodeByRoot[[32]byte{'h'}].weight)
+	require.Equal(t, uint64(0), f.store.nodeByRoot[[32]byte{'d'}].weight.Uint64())
+	require.Equal(t, uint64(100), f.store.nodeByRoot[[32]byte{'h'}].weight.Uint64())
 	// Set current epoch to 3, and H's unrealized checkpoint. Check it's head
 	driftGenesisTime(f, 99, 0)
 	require.NoError(t, f.store.setUnrealizedJustifiedEpoch([32]byte{'h'}, 2))
@@ -253,8 +253,8 @@ func TestStore_ForkNextEpoch(t *testing.T) {
 	require.NoError(t, err)
 	require.Equal(t, [32]byte{'h'}, headRoot)
 	require.Equal(t, primitives.Epoch(2), f.JustifiedCheckpoint().Epoch)
-	require.Equal(t, uint64(0), f.store.nodeByRoot[[32]byte{'d'}].weight)
-	require.Equal(t, uint64(100), f.store.nodeByRoot[[32]byte{'h'}].weight)
+	require.Equal(t, uint64(0), f.store.nodeByRoot[[32]byte{'d'}].weight.Uint64())
+	require.Equal(t, uint64(100), f.store.nodeByRoot[[32]byte{'h'}].weight.Uint64())
 }
 
 func TestStore_PullTips_Heuristics(t *testing.T) {
diff --git a/beacon-chain/forkchoice/interfaces.go b/beacon-chain/forkchoice/interfaces.go
index d8d94e246..bd5c25d75 100644
--- a/beacon-chain/forkchoice/interfaces.go
+++ b/beacon-chain/forkchoice/interfaces.go
@@ -2,6 +2,7 @@ package forkchoice
 
 import (
 	"context"
+	"math/big"
 
 	forkchoicetypes "github.com/prysmaticlabs/prysm/v5/beacon-chain/forkchoice/types"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/state"
@@ -79,7 +80,7 @@ type FastGetter interface {
 	Slot([32]byte) (primitives.Slot, error)
 	TargetRootForEpoch([32]byte, primitives.Epoch) ([32]byte, error)
 	UnrealizedJustifiedPayloadBlockHash() [32]byte
-	Weight(root [32]byte) (uint64, error)
+	Weight(root [32]byte) (*big.Int, error)
 }
 
 // Setter allows to set forkchoice information
diff --git a/beacon-chain/forkchoice/ro.go b/beacon-chain/forkchoice/ro.go
index cf536c522..6653cb918 100644
--- a/beacon-chain/forkchoice/ro.go
+++ b/beacon-chain/forkchoice/ro.go
@@ -1,6 +1,8 @@
 package forkchoice
 
 import (
+	"math/big"
+
 	forkchoicetypes "github.com/prysmaticlabs/prysm/v5/beacon-chain/forkchoice/types"
 	fieldparams "github.com/prysmaticlabs/prysm/v5/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
@@ -129,7 +131,7 @@ func (ro *ROForkChoice) ReceivedBlocksLastEpoch() (uint64, error) {
 }
 
 // Weight delegates to the underlying forkchoice call, under a lock.
-func (ro *ROForkChoice) Weight(root [32]byte) (uint64, error) {
+func (ro *ROForkChoice) Weight(root [32]byte) (*big.Int, error) {
 	ro.l.RLock()
 	defer ro.l.RUnlock()
 	return ro.getter.Weight(root)
diff --git a/beacon-chain/forkchoice/ro_test.go b/beacon-chain/forkchoice/ro_test.go
index e24e2fcdf..fd3a0f1c8 100644
--- a/beacon-chain/forkchoice/ro_test.go
+++ b/beacon-chain/forkchoice/ro_test.go
@@ -2,6 +2,7 @@ package forkchoice
 
 import (
 	"io"
+	"math/big"
 	"testing"
 
 	forkchoicetypes "github.com/prysmaticlabs/prysm/v5/beacon-chain/forkchoice/types"
@@ -261,9 +262,9 @@ func (ro *mockROForkchoice) ReceivedBlocksLastEpoch() (uint64, error) {
 	return 0, nil
 }
 
-func (ro *mockROForkchoice) Weight(_ [32]byte) (uint64, error) {
+func (ro *mockROForkchoice) Weight(_ [32]byte) (*big.Int, error) {
 	ro.calls = append(ro.calls, weightCalled)
-	return 0, nil
+	return new(big.Int), nil
 }
 
 func (ro *mockROForkchoice) IsOptimistic(_ [32]byte) (bool, error) {
diff --git a/beacon-chain/rpc/prysm/v1alpha1/beacon/validators.go b/beacon-chain/rpc/prysm/v1alpha1/beacon/validators.go
index efad2fa89..3fa9cb36e 100644
--- a/beacon-chain/rpc/prysm/v1alpha1/beacon/validators.go
+++ b/beacon-chain/rpc/prysm/v1alpha1/beacon/validators.go
@@ -3,6 +3,7 @@ package beacon
 import (
 	"context"
 	"fmt"
+	"math/big"
 	"sort"
 	"strconv"
 
@@ -543,21 +544,36 @@ func (bs *Server) GetValidatorParticipation(
 	}
 
 	cp := bs.FinalizationFetcher.FinalizedCheckpt()
+	var globalParticipationRate float32
+	zero := big.NewInt(0)
+	if b.PrevEpochTargetAttested.Cmp(zero) == 1 || b.ActivePrevEpoch.Cmp(zero) == 1 {
+		prevEpochTargetAttested, f1 := new(big.Float).SetString(b.PrevEpochTargetAttested.String())
+		if !f1 {
+			globalParticipationRate = float32(0)
+		}
+		activePrevEpoch, f2 := new(big.Float).SetString(b.ActivePrevEpoch.String())
+		if !f2 {
+			globalParticipationRate = float32(0)
+		}
+		if f1 && f2 {
+			globalParticipationRate, _ = new(big.Float).Quo(prevEpochTargetAttested, activePrevEpoch).Float32()
+		}
+	}
 	p := &ethpb.ValidatorParticipationResponse{
 		Epoch:     requestedEpoch,
 		Finalized: requestedEpoch <= cp.Epoch,
 		Participation: &ethpb.ValidatorParticipation{
 			// TODO(7130): Remove these three deprecated fields.
-			GlobalParticipationRate:          float32(b.PrevEpochTargetAttested) / float32(b.ActivePrevEpoch),
-			VotedEther:                       b.PrevEpochTargetAttested,
-			EligibleEther:                    b.ActivePrevEpoch,
-			CurrentEpochActiveGwei:           b.ActiveCurrentEpoch,
-			CurrentEpochAttestingGwei:        b.CurrentEpochAttested,
-			CurrentEpochTargetAttestingGwei:  b.CurrentEpochTargetAttested,
-			PreviousEpochActiveGwei:          b.ActivePrevEpoch,
-			PreviousEpochAttestingGwei:       b.PrevEpochAttested,
-			PreviousEpochTargetAttestingGwei: b.PrevEpochTargetAttested,
-			PreviousEpochHeadAttestingGwei:   b.PrevEpochHeadAttested,
+			GlobalParticipationRate:          globalParticipationRate,
+			VotedEther:                       b.PrevEpochTargetAttested.String(),
+			EligibleEther:                    b.ActivePrevEpoch.String(),
+			CurrentEpochActiveGwei:           b.ActiveCurrentEpoch.String(),
+			CurrentEpochAttestingGwei:        b.CurrentEpochAttested.String(),
+			CurrentEpochTargetAttestingGwei:  b.CurrentEpochTargetAttested.String(),
+			PreviousEpochActiveGwei:          b.ActivePrevEpoch.String(),
+			PreviousEpochAttestingGwei:       b.PrevEpochAttested.String(),
+			PreviousEpochTargetAttestingGwei: b.PrevEpochTargetAttested.String(),
+			PreviousEpochHeadAttestingGwei:   b.PrevEpochHeadAttested.String(),
 		},
 	}
 
diff --git a/beacon-chain/rpc/prysm/v1alpha1/beacon/validators_test.go b/beacon-chain/rpc/prysm/v1alpha1/beacon/validators_test.go
index 56a6a3f3e..9e71817a4 100644
--- a/beacon-chain/rpc/prysm/v1alpha1/beacon/validators_test.go
+++ b/beacon-chain/rpc/prysm/v1alpha1/beacon/validators_test.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/binary"
 	"fmt"
+	"math/big"
 	"sort"
 	"strconv"
 	"testing"
@@ -1566,18 +1567,35 @@ func TestServer_GetValidatorParticipation_CurrentAndPrevEpoch(t *testing.T) {
 
 	res, err := bs.GetValidatorParticipation(ctx, &ethpb.GetValidatorParticipationRequest{QueryFilter: &ethpb.GetValidatorParticipationRequest_Epoch{Epoch: 1}})
 	require.NoError(t, err)
-
+	effectiveBal := new(big.Int).SetUint64(params.BeaconConfig().MaxEffectiveBalance)
+	effectiveBalIncr := new(big.Int).SetUint64(params.BeaconConfig().EffectiveBalanceIncrement)
+	valCountTimesEffBal := new(big.Int).Mul(new(big.Int).SetUint64(validatorCount), effectiveBal)
+	var globalParticipationRate float32
+	zero := big.NewInt(0)
+	if effectiveBalIncr.Cmp(zero) == 1 || valCountTimesEffBal.Cmp(zero) == 1 {
+		prevEpochTargetAttested, f1 := new(big.Float).SetString(effectiveBalIncr.String())
+		if !f1 {
+			globalParticipationRate = float32(0)
+		}
+		activePrevEpoch, f2 := new(big.Float).SetString(valCountTimesEffBal.String())
+		if !f2 {
+			globalParticipationRate = float32(0)
+		}
+		if f1 && f2 {
+			globalParticipationRate, _ = new(big.Float).Quo(prevEpochTargetAttested, activePrevEpoch).Float32()
+		}
+	}
 	wanted := &ethpb.ValidatorParticipation{
-		GlobalParticipationRate:          float32(params.BeaconConfig().EffectiveBalanceIncrement) / float32(validatorCount*params.BeaconConfig().MaxEffectiveBalance),
-		VotedEther:                       params.BeaconConfig().EffectiveBalanceIncrement,
-		EligibleEther:                    validatorCount * params.BeaconConfig().MaxEffectiveBalance,
-		CurrentEpochActiveGwei:           validatorCount * params.BeaconConfig().MaxEffectiveBalance,
-		CurrentEpochAttestingGwei:        params.BeaconConfig().EffectiveBalanceIncrement,
-		CurrentEpochTargetAttestingGwei:  params.BeaconConfig().EffectiveBalanceIncrement,
-		PreviousEpochActiveGwei:          validatorCount * params.BeaconConfig().MaxEffectiveBalance,
-		PreviousEpochAttestingGwei:       params.BeaconConfig().EffectiveBalanceIncrement,
-		PreviousEpochTargetAttestingGwei: params.BeaconConfig().EffectiveBalanceIncrement,
-		PreviousEpochHeadAttestingGwei:   params.BeaconConfig().EffectiveBalanceIncrement,
+		GlobalParticipationRate:          globalParticipationRate,
+		VotedEther:                       effectiveBalIncr.String(),
+		EligibleEther:                    valCountTimesEffBal.String(),
+		CurrentEpochActiveGwei:           valCountTimesEffBal.String(),
+		CurrentEpochAttestingGwei:        effectiveBalIncr.String(),
+		CurrentEpochTargetAttestingGwei:  effectiveBalIncr.String(),
+		PreviousEpochActiveGwei:          valCountTimesEffBal.String(),
+		PreviousEpochAttestingGwei:       effectiveBalIncr.String(),
+		PreviousEpochTargetAttestingGwei: effectiveBalIncr.String(),
+		PreviousEpochHeadAttestingGwei:   effectiveBalIncr.String(),
 	}
 	assert.DeepEqual(t, true, res.Finalized, "Incorrect validator participation respond")
 	assert.DeepEqual(t, wanted, res.Participation, "Incorrect validator participation respond")
@@ -1646,17 +1664,35 @@ func TestServer_GetValidatorParticipation_OrphanedUntilGenesis(t *testing.T) {
 	res, err := bs.GetValidatorParticipation(ctx, &ethpb.GetValidatorParticipationRequest{QueryFilter: &ethpb.GetValidatorParticipationRequest_Epoch{Epoch: 1}})
 	require.NoError(t, err)
 
+	effectiveBal := new(big.Int).SetUint64(params.BeaconConfig().MaxEffectiveBalance)
+	effectiveBalIncr := new(big.Int).SetUint64(params.BeaconConfig().EffectiveBalanceIncrement)
+	valCountTimesEffBal := new(big.Int).Mul(new(big.Int).SetUint64(validatorCount), effectiveBal)
+	var globalParticipationRate float32
+	zero := big.NewInt(0)
+	if effectiveBalIncr.Cmp(zero) == 1 || valCountTimesEffBal.Cmp(zero) == 1 {
+		prevEpochTargetAttested, f1 := new(big.Float).SetString(effectiveBalIncr.String())
+		if !f1 {
+			globalParticipationRate = float32(0)
+		}
+		activePrevEpoch, f2 := new(big.Float).SetString(valCountTimesEffBal.String())
+		if !f2 {
+			globalParticipationRate = float32(0)
+		}
+		if f1 && f2 {
+			globalParticipationRate, _ = new(big.Float).Quo(prevEpochTargetAttested, activePrevEpoch).Float32()
+		}
+	}
 	wanted := &ethpb.ValidatorParticipation{
-		GlobalParticipationRate:          float32(params.BeaconConfig().EffectiveBalanceIncrement) / float32(validatorCount*params.BeaconConfig().MaxEffectiveBalance),
-		VotedEther:                       params.BeaconConfig().EffectiveBalanceIncrement,
-		EligibleEther:                    validatorCount * params.BeaconConfig().MaxEffectiveBalance,
-		CurrentEpochActiveGwei:           validatorCount * params.BeaconConfig().MaxEffectiveBalance,
-		CurrentEpochAttestingGwei:        params.BeaconConfig().EffectiveBalanceIncrement,
-		CurrentEpochTargetAttestingGwei:  params.BeaconConfig().EffectiveBalanceIncrement,
-		PreviousEpochActiveGwei:          validatorCount * params.BeaconConfig().MaxEffectiveBalance,
-		PreviousEpochAttestingGwei:       params.BeaconConfig().EffectiveBalanceIncrement,
-		PreviousEpochTargetAttestingGwei: params.BeaconConfig().EffectiveBalanceIncrement,
-		PreviousEpochHeadAttestingGwei:   params.BeaconConfig().EffectiveBalanceIncrement,
+		GlobalParticipationRate:          globalParticipationRate,
+		VotedEther:                       effectiveBalIncr.String(),
+		EligibleEther:                    valCountTimesEffBal.String(),
+		CurrentEpochActiveGwei:           valCountTimesEffBal.String(),
+		CurrentEpochAttestingGwei:        effectiveBalIncr.String(),
+		CurrentEpochTargetAttestingGwei:  effectiveBalIncr.String(),
+		PreviousEpochActiveGwei:          valCountTimesEffBal.String(),
+		PreviousEpochAttestingGwei:       effectiveBalIncr.String(),
+		PreviousEpochTargetAttestingGwei: effectiveBalIncr.String(),
+		PreviousEpochHeadAttestingGwei:   effectiveBalIncr.String(),
 	}
 	assert.DeepEqual(t, true, res.Finalized, "Incorrect validator participation respond")
 	assert.DeepEqual(t, wanted, res.Participation, "Incorrect validator participation respond")
@@ -1757,17 +1793,20 @@ func runGetValidatorParticipationCurrentAndPrevEpoch(t *testing.T, genState stat
 	res, err := bs.GetValidatorParticipation(ctx, &ethpb.GetValidatorParticipationRequest{QueryFilter: &ethpb.GetValidatorParticipationRequest_Epoch{Epoch: 0}})
 	require.NoError(t, err)
 
+	effectiveBal := new(big.Int).SetUint64(params.BeaconConfig().MaxEffectiveBalance)
+	effectiveBalIncr := new(big.Int).SetUint64(params.BeaconConfig().EffectiveBalanceIncrement)
+	valCountTimesEffBal := new(big.Int).Mul(new(big.Int).SetUint64(validatorCount), effectiveBal)
 	wanted := &ethpb.ValidatorParticipation{
-		GlobalParticipationRate:          1,
-		VotedEther:                       validatorCount * params.BeaconConfig().MaxEffectiveBalance,
-		EligibleEther:                    validatorCount * params.BeaconConfig().MaxEffectiveBalance,
-		CurrentEpochActiveGwei:           validatorCount * params.BeaconConfig().MaxEffectiveBalance,
-		CurrentEpochAttestingGwei:        validatorCount * params.BeaconConfig().MaxEffectiveBalance,
-		CurrentEpochTargetAttestingGwei:  validatorCount * params.BeaconConfig().MaxEffectiveBalance,
-		PreviousEpochActiveGwei:          validatorCount * params.BeaconConfig().MaxEffectiveBalance,
-		PreviousEpochAttestingGwei:       validatorCount * params.BeaconConfig().MaxEffectiveBalance,
-		PreviousEpochTargetAttestingGwei: validatorCount * params.BeaconConfig().MaxEffectiveBalance,
-		PreviousEpochHeadAttestingGwei:   validatorCount * params.BeaconConfig().MaxEffectiveBalance,
+		GlobalParticipationRate:          float32(1),
+		VotedEther:                       valCountTimesEffBal.String(),
+		EligibleEther:                    valCountTimesEffBal.String(),
+		CurrentEpochActiveGwei:           valCountTimesEffBal.String(),
+		CurrentEpochAttestingGwei:        valCountTimesEffBal.String(),
+		CurrentEpochTargetAttestingGwei:  valCountTimesEffBal.String(),
+		PreviousEpochActiveGwei:          valCountTimesEffBal.String(),
+		PreviousEpochAttestingGwei:       valCountTimesEffBal.String(),
+		PreviousEpochTargetAttestingGwei: valCountTimesEffBal.String(),
+		PreviousEpochHeadAttestingGwei:   valCountTimesEffBal.String(),
 	}
 	assert.DeepEqual(t, true, res.Finalized, "Incorrect validator participation respond")
 	assert.DeepEqual(t, wanted, res.Participation, "Incorrect validator participation respond")
@@ -1776,16 +1815,16 @@ func runGetValidatorParticipationCurrentAndPrevEpoch(t *testing.T, genState stat
 	require.NoError(t, err)
 
 	wanted = &ethpb.ValidatorParticipation{
-		GlobalParticipationRate:          1,
-		VotedEther:                       validatorCount * params.BeaconConfig().MaxEffectiveBalance,
-		EligibleEther:                    validatorCount * params.BeaconConfig().MaxEffectiveBalance,
-		CurrentEpochActiveGwei:           validatorCount * params.BeaconConfig().MaxEffectiveBalance,
-		CurrentEpochAttestingGwei:        params.BeaconConfig().EffectiveBalanceIncrement, // Empty because after one epoch, current participation rotates to previous
-		CurrentEpochTargetAttestingGwei:  params.BeaconConfig().EffectiveBalanceIncrement,
-		PreviousEpochActiveGwei:          validatorCount * params.BeaconConfig().MaxEffectiveBalance,
-		PreviousEpochAttestingGwei:       validatorCount * params.BeaconConfig().MaxEffectiveBalance,
-		PreviousEpochTargetAttestingGwei: validatorCount * params.BeaconConfig().MaxEffectiveBalance,
-		PreviousEpochHeadAttestingGwei:   validatorCount * params.BeaconConfig().MaxEffectiveBalance,
+		GlobalParticipationRate:          float32(1),
+		VotedEther:                       valCountTimesEffBal.String(),
+		EligibleEther:                    valCountTimesEffBal.String(),
+		CurrentEpochActiveGwei:           valCountTimesEffBal.String(),
+		CurrentEpochAttestingGwei:        effectiveBalIncr.String(), // Empty because after one epoch, current participation rotates to previous
+		CurrentEpochTargetAttestingGwei:  effectiveBalIncr.String(),
+		PreviousEpochActiveGwei:          valCountTimesEffBal.String(),
+		PreviousEpochAttestingGwei:       valCountTimesEffBal.String(),
+		PreviousEpochTargetAttestingGwei: valCountTimesEffBal.String(),
+		PreviousEpochHeadAttestingGwei:   valCountTimesEffBal.String(),
 	}
 	assert.DeepEqual(t, true, res.Finalized, "Incorrect validator participation respond")
 	assert.DeepEqual(t, wanted, res.Participation, "Incorrect validator participation respond")
diff --git a/beacon-chain/state/interfaces.go b/beacon-chain/state/interfaces.go
index 11d063ebf..5e2158d6c 100644
--- a/beacon-chain/state/interfaces.go
+++ b/beacon-chain/state/interfaces.go
@@ -6,6 +6,7 @@ package state
 import (
 	"context"
 	"encoding/json"
+	"math/big"
 
 	"github.com/prysmaticlabs/go-bitfield"
 	fieldparams "github.com/prysmaticlabs/prysm/v5/config/fieldparams"
@@ -143,7 +144,7 @@ type ReadOnlyCheckpoint interface {
 	FinalizedCheckpoint() *ethpb.Checkpoint
 	FinalizedCheckpointEpoch() primitives.Epoch
 	JustificationBits() bitfield.Bitvector4
-	UnrealizedCheckpointBalances() (uint64, uint64, uint64, error)
+	UnrealizedCheckpointBalances() (*big.Int, *big.Int, *big.Int, error)
 }
 
 // ReadOnlyBlockRoots defines a struct which only has read access to block roots methods.
diff --git a/beacon-chain/state/state-native/getters_participation.go b/beacon-chain/state/state-native/getters_participation.go
index 2693695b3..3ca21b1a9 100644
--- a/beacon-chain/state/state-native/getters_participation.go
+++ b/beacon-chain/state/state-native/getters_participation.go
@@ -1,6 +1,8 @@
 package state_native
 
 import (
+	"math/big"
+
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/time"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/state/stateutil"
 	"github.com/prysmaticlabs/prysm/v5/config/features"
@@ -42,9 +44,9 @@ func (b *BeaconState) PreviousEpochParticipation() ([]byte, error) {
 // UnrealizedCheckpointBalances returns the total balances: active, target attested in
 // current epoch and target attested in previous epoch. This function is used to
 // compute the "unrealized justification" that a synced Beacon Block will have.
-func (b *BeaconState) UnrealizedCheckpointBalances() (uint64, uint64, uint64, error) {
+func (b *BeaconState) UnrealizedCheckpointBalances() (*big.Int, *big.Int, *big.Int, error) {
 	if b.version == version.Phase0 {
-		return 0, 0, 0, errNotSupported("UnrealizedCheckpointBalances", b.version)
+		return big.NewInt(0), big.NewInt(0), big.NewInt(0), errNotSupported("UnrealizedCheckpointBalances", b.version)
 	}
 
 	currentEpoch := time.CurrentEpoch(b)
@@ -54,7 +56,7 @@ func (b *BeaconState) UnrealizedCheckpointBalances() (uint64, uint64, uint64, er
 	cp := b.currentEpochParticipation
 	pp := b.previousEpochParticipation
 	if cp == nil || pp == nil {
-		return 0, 0, 0, ErrNilParticipation
+		return big.NewInt(0), big.NewInt(0), big.NewInt(0), ErrNilParticipation
 	}
 
 	if features.Get().EnableExperimentalState {
diff --git a/beacon-chain/state/state-native/getters_participation_test.go b/beacon-chain/state/state-native/getters_participation_test.go
index b5aac094e..ce05127e1 100644
--- a/beacon-chain/state/state-native/getters_participation_test.go
+++ b/beacon-chain/state/state-native/getters_participation_test.go
@@ -34,9 +34,9 @@ func TestState_UnrealizedCheckpointBalances(t *testing.T) {
 	allActive := params.BeaconConfig().MinGenesisActiveValidatorCount * params.BeaconConfig().MaxEffectiveBalance
 	active, previous, current, err := state.UnrealizedCheckpointBalances()
 	require.NoError(t, err)
-	require.Equal(t, allActive, active)
-	require.Equal(t, params.BeaconConfig().EffectiveBalanceIncrement, current)
-	require.Equal(t, params.BeaconConfig().EffectiveBalanceIncrement, previous)
+	require.Equal(t, allActive, active.Uint64())
+	require.Equal(t, params.BeaconConfig().EffectiveBalanceIncrement, current.Uint64())
+	require.Equal(t, params.BeaconConfig().EffectiveBalanceIncrement, previous.Uint64())
 
 	// Add some votes in the last two epochs:
 	base.CurrentEpochParticipation[0] = 0xFF
@@ -47,9 +47,9 @@ func TestState_UnrealizedCheckpointBalances(t *testing.T) {
 	require.NoError(t, err)
 	active, previous, current, err = state.UnrealizedCheckpointBalances()
 	require.NoError(t, err)
-	require.Equal(t, allActive, active)
-	require.Equal(t, params.BeaconConfig().MaxEffectiveBalance, current)
-	require.Equal(t, 2*params.BeaconConfig().MaxEffectiveBalance, previous)
+	require.Equal(t, allActive, active.Uint64())
+	require.Equal(t, params.BeaconConfig().MaxEffectiveBalance, current.Uint64())
+	require.Equal(t, 2*params.BeaconConfig().MaxEffectiveBalance, previous.Uint64())
 
 	// Slash some validators
 	validators[0].Slashed = true
@@ -57,8 +57,8 @@ func TestState_UnrealizedCheckpointBalances(t *testing.T) {
 	require.NoError(t, err)
 	active, previous, current, err = state.UnrealizedCheckpointBalances()
 	require.NoError(t, err)
-	require.Equal(t, allActive, active)
-	require.Equal(t, params.BeaconConfig().EffectiveBalanceIncrement, current)
-	require.Equal(t, params.BeaconConfig().MaxEffectiveBalance, previous)
+	require.Equal(t, allActive, active.Uint64())
+	require.Equal(t, params.BeaconConfig().EffectiveBalanceIncrement, current.Uint64())
+	require.Equal(t, params.BeaconConfig().MaxEffectiveBalance, previous.Uint64())
 
 }
diff --git a/beacon-chain/state/stateutil/unrealized_justification.go b/beacon-chain/state/stateutil/unrealized_justification.go
index 7ca4eac6b..3ef1de93f 100644
--- a/beacon-chain/state/stateutil/unrealized_justification.go
+++ b/beacon-chain/state/stateutil/unrealized_justification.go
@@ -1,10 +1,11 @@
 package stateutil
 
 import (
+	"math/big"
+
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v5/config/params"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/v5/math"
 )
 
 // UnrealizedCheckpointBalances returns the total current active balance, the
@@ -12,58 +13,50 @@ import (
 // current epoch correctly attested for target balance. It takes the current and
 // previous epoch participation bits as parameters so implicitly only works for
 // beacon states post-Altair.
-func UnrealizedCheckpointBalances(cp, pp []byte, validators ValReader, currentEpoch primitives.Epoch) (uint64, uint64, uint64, error) {
+func UnrealizedCheckpointBalances(cp, pp []byte, validators ValReader, currentEpoch primitives.Epoch) (*big.Int, *big.Int, *big.Int, error) {
 	targetIdx := params.BeaconConfig().TimelyTargetFlagIndex
-	activeBalance := uint64(0)
-	currentTarget := uint64(0)
-	prevTarget := uint64(0)
+	activeBalance := big.NewInt(0)
+	currentTarget := big.NewInt(0)
+	prevTarget := big.NewInt(0)
 	if len(cp) < validators.Len() || len(pp) < validators.Len() {
-		return 0, 0, 0, errors.New("participation does not match validator set")
+		return activeBalance, currentTarget, prevTarget, errors.New("participation does not match validator set")
 	}
 
 	valLength := validators.Len()
 	for i := 0; i < valLength; i++ {
 		v, err := validators.At(i)
 		if err != nil {
-			return 0, 0, 0, err
+			return activeBalance, currentTarget, prevTarget, err
 		}
 		activeCurrent := v.ActivationEpoch <= currentEpoch && currentEpoch < v.ExitEpoch
+		effectiveBalance := new(big.Int).SetUint64(v.EffectiveBalance)
 		if activeCurrent {
-			activeBalance, err = math.Add64(activeBalance, v.EffectiveBalance)
-			if err != nil {
-				return 0, 0, 0, err
-			}
+			activeBalance.Add(activeBalance, effectiveBalance)
 		}
 		if v.Slashed {
 			continue
 		}
 		if activeCurrent && ((cp[i]>>targetIdx)&1) == 1 {
-			currentTarget, err = math.Add64(currentTarget, v.EffectiveBalance)
-			if err != nil {
-				return 0, 0, 0, err
-			}
+			currentTarget.Add(currentTarget, effectiveBalance)
 		}
 		activePrevious := v.ActivationEpoch < currentEpoch && currentEpoch <= v.ExitEpoch
 		if activePrevious && ((pp[i]>>targetIdx)&1) == 1 {
-			prevTarget, err = math.Add64(prevTarget, v.EffectiveBalance)
-			if err != nil {
-				return 0, 0, 0, err
-			}
+			prevTarget.Add(prevTarget, effectiveBalance)
 		}
 	}
 	activeBalance, prevTarget, currentTarget = ensureLowerBound(activeBalance, prevTarget, currentTarget)
 	return activeBalance, prevTarget, currentTarget, nil
 }
 
-func ensureLowerBound(activeCurrEpoch, prevTargetAttested, currTargetAttested uint64) (uint64, uint64, uint64) {
-	ebi := params.BeaconConfig().EffectiveBalanceIncrement
-	if ebi > activeCurrEpoch {
+func ensureLowerBound(activeCurrEpoch, prevTargetAttested, currTargetAttested *big.Int) (*big.Int, *big.Int, *big.Int) {
+	ebi := new(big.Int).SetUint64(params.BeaconConfig().EffectiveBalanceIncrement)
+	if ebi.Cmp(activeCurrEpoch) > 0 {
 		activeCurrEpoch = ebi
 	}
-	if ebi > prevTargetAttested {
+	if ebi.Cmp(prevTargetAttested) > 0 {
 		prevTargetAttested = ebi
 	}
-	if ebi > currTargetAttested {
+	if ebi.Cmp(currTargetAttested) > 0 {
 		currTargetAttested = ebi
 	}
 	return activeCurrEpoch, prevTargetAttested, currTargetAttested
diff --git a/beacon-chain/state/stateutil/unrealized_justification_test.go b/beacon-chain/state/stateutil/unrealized_justification_test.go
index e87c240ec..abd5d6f0e 100644
--- a/beacon-chain/state/stateutil/unrealized_justification_test.go
+++ b/beacon-chain/state/stateutil/unrealized_justification_test.go
@@ -28,9 +28,9 @@ func TestState_UnrealizedCheckpointBalances(t *testing.T) {
 	t.Run("No one voted last two epochs", func(tt *testing.T) {
 		active, previous, current, err := UnrealizedCheckpointBalances(cp, pp, NewValSliceReader(validators), 0)
 		require.NoError(tt, err)
-		require.Equal(tt, expectedActive, active)
-		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, current)
-		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, previous)
+		require.Equal(tt, expectedActive, active.Uint64())
+		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, current.Uint64())
+		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, previous.Uint64())
 	})
 
 	t.Run("bad votes in last two epochs", func(tt *testing.T) {
@@ -38,9 +38,9 @@ func TestState_UnrealizedCheckpointBalances(t *testing.T) {
 		copy(pp, []byte{0x00, 0x00, 0x00, 0x00})
 		active, previous, current, err := UnrealizedCheckpointBalances(cp, pp, NewValSliceReader(validators), 1)
 		require.NoError(tt, err)
-		require.Equal(tt, expectedActive, active)
-		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, current)
-		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, previous)
+		require.Equal(tt, expectedActive, active.Uint64())
+		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, current.Uint64())
+		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, previous.Uint64())
 	})
 
 	t.Run("two votes in last epoch", func(tt *testing.T) {
@@ -48,9 +48,9 @@ func TestState_UnrealizedCheckpointBalances(t *testing.T) {
 		copy(pp, []byte{0x00, 0x00, 0x00, 0x00, 0xFF ^ (1 << targetFlag)})
 		active, previous, current, err := UnrealizedCheckpointBalances(cp, pp, NewValSliceReader(validators), 1)
 		require.NoError(tt, err)
-		require.Equal(tt, expectedActive, active)
-		require.Equal(tt, 2*params.BeaconConfig().MaxEffectiveBalance, current)
-		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, previous)
+		require.Equal(tt, expectedActive, active.Uint64())
+		require.Equal(tt, 2*params.BeaconConfig().MaxEffectiveBalance, current.Uint64())
+		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, previous.Uint64())
 	})
 
 	t.Run("two votes in previous epoch", func(tt *testing.T) {
@@ -58,9 +58,9 @@ func TestState_UnrealizedCheckpointBalances(t *testing.T) {
 		copy(pp, []byte{0xFF ^ (1 << targetFlag), 0xFF ^ (1 << targetFlag), 0xFF ^ (1 << targetFlag), 0x00, 1 << targetFlag, 1 << targetFlag})
 		active, previous, current, err := UnrealizedCheckpointBalances(cp, pp, NewValSliceReader(validators), 1)
 		require.NoError(tt, err)
-		require.Equal(tt, expectedActive, active)
-		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, current)
-		require.Equal(tt, 2*params.BeaconConfig().MaxEffectiveBalance, previous)
+		require.Equal(tt, expectedActive, active.Uint64())
+		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, current.Uint64())
+		require.Equal(tt, 2*params.BeaconConfig().MaxEffectiveBalance, previous.Uint64())
 	})
 
 	t.Run("votes in both epochs, decreased balance in first validator", func(tt *testing.T) {
@@ -70,27 +70,27 @@ func TestState_UnrealizedCheckpointBalances(t *testing.T) {
 		active, previous, current, err := UnrealizedCheckpointBalances(cp, pp, NewValSliceReader(validators), 1)
 		require.NoError(tt, err)
 		expectedActive -= params.BeaconConfig().MinDepositAmount
-		require.Equal(tt, expectedActive, active)
-		require.Equal(tt, 2*params.BeaconConfig().MaxEffectiveBalance-params.BeaconConfig().MinDepositAmount, current)
-		require.Equal(tt, 2*params.BeaconConfig().MaxEffectiveBalance, previous)
+		require.Equal(tt, expectedActive, active.Uint64())
+		require.Equal(tt, 2*params.BeaconConfig().MaxEffectiveBalance-params.BeaconConfig().MinDepositAmount, current.Uint64())
+		require.Equal(tt, 2*params.BeaconConfig().MaxEffectiveBalance, previous.Uint64())
 	})
 
 	t.Run("slash a validator", func(tt *testing.T) {
 		validators[1].Slashed = true
 		active, previous, current, err := UnrealizedCheckpointBalances(cp, pp, NewValSliceReader(validators), 1)
 		require.NoError(tt, err)
-		require.Equal(tt, expectedActive, active)
-		require.Equal(tt, params.BeaconConfig().MaxEffectiveBalance-params.BeaconConfig().MinDepositAmount, current)
-		require.Equal(tt, 2*params.BeaconConfig().MaxEffectiveBalance, previous)
+		require.Equal(tt, expectedActive, active.Uint64())
+		require.Equal(tt, params.BeaconConfig().MaxEffectiveBalance-params.BeaconConfig().MinDepositAmount, current.Uint64())
+		require.Equal(tt, 2*params.BeaconConfig().MaxEffectiveBalance, previous.Uint64())
 	})
 	t.Run("Exit a validator", func(tt *testing.T) {
 		validators[4].ExitEpoch = 1
 		active, previous, current, err := UnrealizedCheckpointBalances(cp, pp, NewValSliceReader(validators), 2)
 		require.NoError(tt, err)
 		expectedActive -= params.BeaconConfig().MaxEffectiveBalance
-		require.Equal(tt, expectedActive, active)
-		require.Equal(tt, params.BeaconConfig().MaxEffectiveBalance-params.BeaconConfig().MinDepositAmount, current)
-		require.Equal(tt, params.BeaconConfig().MaxEffectiveBalance, previous)
+		require.Equal(tt, expectedActive, active.Uint64())
+		require.Equal(tt, params.BeaconConfig().MaxEffectiveBalance-params.BeaconConfig().MinDepositAmount, current.Uint64())
+		require.Equal(tt, params.BeaconConfig().MaxEffectiveBalance, previous.Uint64())
 	})
 }
 
@@ -117,9 +117,9 @@ func TestState_MVSlice_UnrealizedCheckpointBalances(t *testing.T) {
 	t.Run("No one voted last two epochs", func(tt *testing.T) {
 		active, previous, current, err := UnrealizedCheckpointBalances(cp, pp, NewValMultiValueSliceReader(mv, &testObject{id: 0}), 0)
 		require.NoError(tt, err)
-		require.Equal(tt, expectedActive, active)
-		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, current)
-		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, previous)
+		require.Equal(tt, expectedActive, active.Uint64())
+		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, current.Uint64())
+		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, previous.Uint64())
 	})
 
 	t.Run("bad votes in last two epochs", func(tt *testing.T) {
@@ -127,9 +127,9 @@ func TestState_MVSlice_UnrealizedCheckpointBalances(t *testing.T) {
 		copy(pp, []byte{0x00, 0x00, 0x00, 0x00})
 		active, previous, current, err := UnrealizedCheckpointBalances(cp, pp, NewValMultiValueSliceReader(mv, &testObject{id: 0}), 1)
 		require.NoError(tt, err)
-		require.Equal(tt, expectedActive, active)
-		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, current)
-		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, previous)
+		require.Equal(tt, expectedActive, active.Uint64())
+		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, current.Uint64())
+		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, previous.Uint64())
 	})
 
 	t.Run("two votes in last epoch", func(tt *testing.T) {
@@ -137,9 +137,9 @@ func TestState_MVSlice_UnrealizedCheckpointBalances(t *testing.T) {
 		copy(pp, []byte{0x00, 0x00, 0x00, 0x00, 0xFF ^ (1 << targetFlag)})
 		active, previous, current, err := UnrealizedCheckpointBalances(cp, pp, NewValMultiValueSliceReader(mv, &testObject{id: 0}), 1)
 		require.NoError(tt, err)
-		require.Equal(tt, expectedActive, active)
-		require.Equal(tt, 2*params.BeaconConfig().MaxEffectiveBalance, current)
-		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, previous)
+		require.Equal(tt, expectedActive, active.Uint64())
+		require.Equal(tt, 2*params.BeaconConfig().MaxEffectiveBalance, current.Uint64())
+		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, previous.Uint64())
 	})
 
 	t.Run("two votes in previous epoch", func(tt *testing.T) {
@@ -147,9 +147,9 @@ func TestState_MVSlice_UnrealizedCheckpointBalances(t *testing.T) {
 		copy(pp, []byte{0xFF ^ (1 << targetFlag), 0xFF ^ (1 << targetFlag), 0xFF ^ (1 << targetFlag), 0x00, 1 << targetFlag, 1 << targetFlag})
 		active, previous, current, err := UnrealizedCheckpointBalances(cp, pp, NewValMultiValueSliceReader(mv, &testObject{id: 0}), 1)
 		require.NoError(tt, err)
-		require.Equal(tt, expectedActive, active)
-		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, current)
-		require.Equal(tt, 2*params.BeaconConfig().MaxEffectiveBalance, previous)
+		require.Equal(tt, expectedActive, active.Uint64())
+		require.Equal(tt, params.BeaconConfig().EffectiveBalanceIncrement, current.Uint64())
+		require.Equal(tt, 2*params.BeaconConfig().MaxEffectiveBalance, previous.Uint64())
 	})
 
 	t.Run("votes in both epochs, decreased balance in first validator", func(tt *testing.T) {
@@ -159,27 +159,27 @@ func TestState_MVSlice_UnrealizedCheckpointBalances(t *testing.T) {
 		active, previous, current, err := UnrealizedCheckpointBalances(cp, pp, NewValMultiValueSliceReader(mv, &testObject{id: 0}), 1)
 		require.NoError(tt, err)
 		expectedActive -= params.BeaconConfig().MinDepositAmount
-		require.Equal(tt, expectedActive, active)
-		require.Equal(tt, 2*params.BeaconConfig().MaxEffectiveBalance-params.BeaconConfig().MinDepositAmount, current)
-		require.Equal(tt, 2*params.BeaconConfig().MaxEffectiveBalance, previous)
+		require.Equal(tt, expectedActive, active.Uint64())
+		require.Equal(tt, 2*params.BeaconConfig().MaxEffectiveBalance-params.BeaconConfig().MinDepositAmount, current.Uint64())
+		require.Equal(tt, 2*params.BeaconConfig().MaxEffectiveBalance, previous.Uint64())
 	})
 
 	t.Run("slash a validator", func(tt *testing.T) {
 		validators[1].Slashed = true
 		active, previous, current, err := UnrealizedCheckpointBalances(cp, pp, NewValMultiValueSliceReader(mv, &testObject{id: 0}), 1)
 		require.NoError(tt, err)
-		require.Equal(tt, expectedActive, active)
-		require.Equal(tt, params.BeaconConfig().MaxEffectiveBalance-params.BeaconConfig().MinDepositAmount, current)
-		require.Equal(tt, 2*params.BeaconConfig().MaxEffectiveBalance, previous)
+		require.Equal(tt, expectedActive, active.Uint64())
+		require.Equal(tt, params.BeaconConfig().MaxEffectiveBalance-params.BeaconConfig().MinDepositAmount, current.Uint64())
+		require.Equal(tt, 2*params.BeaconConfig().MaxEffectiveBalance, previous.Uint64())
 	})
 	t.Run("Exit a validator", func(tt *testing.T) {
 		validators[4].ExitEpoch = 1
 		active, previous, current, err := UnrealizedCheckpointBalances(cp, pp, NewValMultiValueSliceReader(mv, &testObject{id: 0}), 2)
 		require.NoError(tt, err)
 		expectedActive -= params.BeaconConfig().MaxEffectiveBalance
-		require.Equal(tt, expectedActive, active)
-		require.Equal(tt, params.BeaconConfig().MaxEffectiveBalance-params.BeaconConfig().MinDepositAmount, current)
-		require.Equal(tt, params.BeaconConfig().MaxEffectiveBalance, previous)
+		require.Equal(tt, expectedActive, active.Uint64())
+		require.Equal(tt, params.BeaconConfig().MaxEffectiveBalance-params.BeaconConfig().MinDepositAmount, current.Uint64())
+		require.Equal(tt, params.BeaconConfig().MaxEffectiveBalance, previous.Uint64())
 	})
 }
 
diff --git a/consensus-types/forkchoice/types.go b/consensus-types/forkchoice/types.go
index 3707f80c5..c7db0da41 100644
--- a/consensus-types/forkchoice/types.go
+++ b/consensus-types/forkchoice/types.go
@@ -1,6 +1,8 @@
 package forkchoice
 
 import (
+	"math/big"
+
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
 	eth "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
 )
@@ -45,8 +47,8 @@ type Node struct {
 	FinalizedEpoch           primitives.Epoch
 	UnrealizedJustifiedEpoch primitives.Epoch
 	UnrealizedFinalizedEpoch primitives.Epoch
-	Balance                  uint64
-	Weight                   uint64
+	Balance                  *big.Int
+	Weight                   *big.Int
 	Timestamp                uint64
 	BlockRoot                []byte
 	ParentRoot               []byte
diff --git a/proto/prysm/v1alpha1/validator.pb.go b/proto/prysm/v1alpha1/validator.pb.go
index 55edb0726..7f3bec0b0 100755
--- a/proto/prysm/v1alpha1/validator.pb.go
+++ b/proto/prysm/v1alpha1/validator.pb.go
@@ -1904,16 +1904,16 @@ type ValidatorParticipation struct {
 	// Deprecated: Marked as deprecated in proto/prysm/v1alpha1/validator.proto.
 	GlobalParticipationRate float32 `protobuf:"fixed32,1,opt,name=global_participation_rate,json=globalParticipationRate,proto3" json:"global_participation_rate,omitempty"`
 	// Deprecated: Marked as deprecated in proto/prysm/v1alpha1/validator.proto.
-	VotedEther uint64 `protobuf:"varint,2,opt,name=voted_ether,json=votedEther,proto3" json:"voted_ether,omitempty"`
+	VotedEther string `protobuf:"bytes,2,opt,name=voted_ether,json=votedEther,proto3" json:"voted_ether,omitempty"`
 	// Deprecated: Marked as deprecated in proto/prysm/v1alpha1/validator.proto.
-	EligibleEther                    uint64 `protobuf:"varint,3,opt,name=eligible_ether,json=eligibleEther,proto3" json:"eligible_ether,omitempty"`
-	CurrentEpochActiveGwei           uint64 `protobuf:"varint,4,opt,name=current_epoch_active_gwei,json=currentEpochActiveGwei,proto3" json:"current_epoch_active_gwei,omitempty"`
-	CurrentEpochAttestingGwei        uint64 `protobuf:"varint,5,opt,name=current_epoch_attesting_gwei,json=currentEpochAttestingGwei,proto3" json:"current_epoch_attesting_gwei,omitempty"`
-	CurrentEpochTargetAttestingGwei  uint64 `protobuf:"varint,6,opt,name=current_epoch_target_attesting_gwei,json=currentEpochTargetAttestingGwei,proto3" json:"current_epoch_target_attesting_gwei,omitempty"`
-	PreviousEpochActiveGwei          uint64 `protobuf:"varint,7,opt,name=previous_epoch_active_gwei,json=previousEpochActiveGwei,proto3" json:"previous_epoch_active_gwei,omitempty"`
-	PreviousEpochAttestingGwei       uint64 `protobuf:"varint,8,opt,name=previous_epoch_attesting_gwei,json=previousEpochAttestingGwei,proto3" json:"previous_epoch_attesting_gwei,omitempty"`
-	PreviousEpochTargetAttestingGwei uint64 `protobuf:"varint,9,opt,name=previous_epoch_target_attesting_gwei,json=previousEpochTargetAttestingGwei,proto3" json:"previous_epoch_target_attesting_gwei,omitempty"`
-	PreviousEpochHeadAttestingGwei   uint64 `protobuf:"varint,10,opt,name=previous_epoch_head_attesting_gwei,json=previousEpochHeadAttestingGwei,proto3" json:"previous_epoch_head_attesting_gwei,omitempty"`
+	EligibleEther                    string `protobuf:"bytes,3,opt,name=eligible_ether,json=eligibleEther,proto3" json:"eligible_ether,omitempty"`
+	CurrentEpochActiveGwei           string `protobuf:"bytes,4,opt,name=current_epoch_active_gwei,json=currentEpochActiveGwei,proto3" json:"current_epoch_active_gwei,omitempty"`
+	CurrentEpochAttestingGwei        string `protobuf:"bytes,5,opt,name=current_epoch_attesting_gwei,json=currentEpochAttestingGwei,proto3" json:"current_epoch_attesting_gwei,omitempty"`
+	CurrentEpochTargetAttestingGwei  string `protobuf:"bytes,6,opt,name=current_epoch_target_attesting_gwei,json=currentEpochTargetAttestingGwei,proto3" json:"current_epoch_target_attesting_gwei,omitempty"`
+	PreviousEpochActiveGwei          string `protobuf:"bytes,7,opt,name=previous_epoch_active_gwei,json=previousEpochActiveGwei,proto3" json:"previous_epoch_active_gwei,omitempty"`
+	PreviousEpochAttestingGwei       string `protobuf:"bytes,8,opt,name=previous_epoch_attesting_gwei,json=previousEpochAttestingGwei,proto3" json:"previous_epoch_attesting_gwei,omitempty"`
+	PreviousEpochTargetAttestingGwei string `protobuf:"bytes,9,opt,name=previous_epoch_target_attesting_gwei,json=previousEpochTargetAttestingGwei,proto3" json:"previous_epoch_target_attesting_gwei,omitempty"`
+	PreviousEpochHeadAttestingGwei   string `protobuf:"bytes,10,opt,name=previous_epoch_head_attesting_gwei,json=previousEpochHeadAttestingGwei,proto3" json:"previous_epoch_head_attesting_gwei,omitempty"`
 }
 
 func (x *ValidatorParticipation) Reset() {
@@ -1957,68 +1957,68 @@ func (x *ValidatorParticipation) GetGlobalParticipationRate() float32 {
 }
 
 // Deprecated: Marked as deprecated in proto/prysm/v1alpha1/validator.proto.
-func (x *ValidatorParticipation) GetVotedEther() uint64 {
+func (x *ValidatorParticipation) GetVotedEther() string {
 	if x != nil {
 		return x.VotedEther
 	}
-	return 0
+	return ""
 }
 
 // Deprecated: Marked as deprecated in proto/prysm/v1alpha1/validator.proto.
-func (x *ValidatorParticipation) GetEligibleEther() uint64 {
+func (x *ValidatorParticipation) GetEligibleEther() string {
 	if x != nil {
 		return x.EligibleEther
 	}
-	return 0
+	return ""
 }
 
-func (x *ValidatorParticipation) GetCurrentEpochActiveGwei() uint64 {
+func (x *ValidatorParticipation) GetCurrentEpochActiveGwei() string {
 	if x != nil {
 		return x.CurrentEpochActiveGwei
 	}
-	return 0
+	return ""
 }
 
-func (x *ValidatorParticipation) GetCurrentEpochAttestingGwei() uint64 {
+func (x *ValidatorParticipation) GetCurrentEpochAttestingGwei() string {
 	if x != nil {
 		return x.CurrentEpochAttestingGwei
 	}
-	return 0
+	return ""
 }
 
-func (x *ValidatorParticipation) GetCurrentEpochTargetAttestingGwei() uint64 {
+func (x *ValidatorParticipation) GetCurrentEpochTargetAttestingGwei() string {
 	if x != nil {
 		return x.CurrentEpochTargetAttestingGwei
 	}
-	return 0
+	return ""
 }
 
-func (x *ValidatorParticipation) GetPreviousEpochActiveGwei() uint64 {
+func (x *ValidatorParticipation) GetPreviousEpochActiveGwei() string {
 	if x != nil {
 		return x.PreviousEpochActiveGwei
 	}
-	return 0
+	return ""
 }
 
-func (x *ValidatorParticipation) GetPreviousEpochAttestingGwei() uint64 {
+func (x *ValidatorParticipation) GetPreviousEpochAttestingGwei() string {
 	if x != nil {
 		return x.PreviousEpochAttestingGwei
 	}
-	return 0
+	return ""
 }
 
-func (x *ValidatorParticipation) GetPreviousEpochTargetAttestingGwei() uint64 {
+func (x *ValidatorParticipation) GetPreviousEpochTargetAttestingGwei() string {
 	if x != nil {
 		return x.PreviousEpochTargetAttestingGwei
 	}
-	return 0
+	return ""
 }
 
-func (x *ValidatorParticipation) GetPreviousEpochHeadAttestingGwei() uint64 {
+func (x *ValidatorParticipation) GetPreviousEpochHeadAttestingGwei() string {
 	if x != nil {
 		return x.PreviousEpochHeadAttestingGwei
 	}
-	return 0
+	return ""
 }
 
 type ValidatorInfo struct {
@@ -3417,39 +3417,39 @@ var file_proto_prysm_v1alpha1_validator_proto_rawDesc = []byte{
 	0x72, 0x61, 0x74, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x02, 0x42, 0x02, 0x18, 0x01, 0x52, 0x17,
 	0x67, 0x6c, 0x6f, 0x62, 0x61, 0x6c, 0x50, 0x61, 0x72, 0x74, 0x69, 0x63, 0x69, 0x70, 0x61, 0x74,
 	0x69, 0x6f, 0x6e, 0x52, 0x61, 0x74, 0x65, 0x12, 0x23, 0x0a, 0x0b, 0x76, 0x6f, 0x74, 0x65, 0x64,
-	0x5f, 0x65, 0x74, 0x68, 0x65, 0x72, 0x18, 0x02, 0x20, 0x01, 0x28, 0x04, 0x42, 0x02, 0x18, 0x01,
+	0x5f, 0x65, 0x74, 0x68, 0x65, 0x72, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x42, 0x02, 0x18, 0x01,
 	0x52, 0x0a, 0x76, 0x6f, 0x74, 0x65, 0x64, 0x45, 0x74, 0x68, 0x65, 0x72, 0x12, 0x29, 0x0a, 0x0e,
 	0x65, 0x6c, 0x69, 0x67, 0x69, 0x62, 0x6c, 0x65, 0x5f, 0x65, 0x74, 0x68, 0x65, 0x72, 0x18, 0x03,
-	0x20, 0x01, 0x28, 0x04, 0x42, 0x02, 0x18, 0x01, 0x52, 0x0d, 0x65, 0x6c, 0x69, 0x67, 0x69, 0x62,
+	0x20, 0x01, 0x28, 0x09, 0x42, 0x02, 0x18, 0x01, 0x52, 0x0d, 0x65, 0x6c, 0x69, 0x67, 0x69, 0x62,
 	0x6c, 0x65, 0x45, 0x74, 0x68, 0x65, 0x72, 0x12, 0x39, 0x0a, 0x19, 0x63, 0x75, 0x72, 0x72, 0x65,
 	0x6e, 0x74, 0x5f, 0x65, 0x70, 0x6f, 0x63, 0x68, 0x5f, 0x61, 0x63, 0x74, 0x69, 0x76, 0x65, 0x5f,
-	0x67, 0x77, 0x65, 0x69, 0x18, 0x04, 0x20, 0x01, 0x28, 0x04, 0x52, 0x16, 0x63, 0x75, 0x72, 0x72,
+	0x67, 0x77, 0x65, 0x69, 0x18, 0x04, 0x20, 0x01, 0x28, 0x09, 0x52, 0x16, 0x63, 0x75, 0x72, 0x72,
 	0x65, 0x6e, 0x74, 0x45, 0x70, 0x6f, 0x63, 0x68, 0x41, 0x63, 0x74, 0x69, 0x76, 0x65, 0x47, 0x77,
 	0x65, 0x69, 0x12, 0x3f, 0x0a, 0x1c, 0x63, 0x75, 0x72, 0x72, 0x65, 0x6e, 0x74, 0x5f, 0x65, 0x70,
 	0x6f, 0x63, 0x68, 0x5f, 0x61, 0x74, 0x74, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x67, 0x5f, 0x67, 0x77,
-	0x65, 0x69, 0x18, 0x05, 0x20, 0x01, 0x28, 0x04, 0x52, 0x19, 0x63, 0x75, 0x72, 0x72, 0x65, 0x6e,
+	0x65, 0x69, 0x18, 0x05, 0x20, 0x01, 0x28, 0x09, 0x52, 0x19, 0x63, 0x75, 0x72, 0x72, 0x65, 0x6e,
 	0x74, 0x45, 0x70, 0x6f, 0x63, 0x68, 0x41, 0x74, 0x74, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x67, 0x47,
 	0x77, 0x65, 0x69, 0x12, 0x4c, 0x0a, 0x23, 0x63, 0x75, 0x72, 0x72, 0x65, 0x6e, 0x74, 0x5f, 0x65,
 	0x70, 0x6f, 0x63, 0x68, 0x5f, 0x74, 0x61, 0x72, 0x67, 0x65, 0x74, 0x5f, 0x61, 0x74, 0x74, 0x65,
-	0x73, 0x74, 0x69, 0x6e, 0x67, 0x5f, 0x67, 0x77, 0x65, 0x69, 0x18, 0x06, 0x20, 0x01, 0x28, 0x04,
+	0x73, 0x74, 0x69, 0x6e, 0x67, 0x5f, 0x67, 0x77, 0x65, 0x69, 0x18, 0x06, 0x20, 0x01, 0x28, 0x09,
 	0x52, 0x1f, 0x63, 0x75, 0x72, 0x72, 0x65, 0x6e, 0x74, 0x45, 0x70, 0x6f, 0x63, 0x68, 0x54, 0x61,
 	0x72, 0x67, 0x65, 0x74, 0x41, 0x74, 0x74, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x67, 0x47, 0x77, 0x65,
 	0x69, 0x12, 0x3b, 0x0a, 0x1a, 0x70, 0x72, 0x65, 0x76, 0x69, 0x6f, 0x75, 0x73, 0x5f, 0x65, 0x70,
 	0x6f, 0x63, 0x68, 0x5f, 0x61, 0x63, 0x74, 0x69, 0x76, 0x65, 0x5f, 0x67, 0x77, 0x65, 0x69, 0x18,
-	0x07, 0x20, 0x01, 0x28, 0x04, 0x52, 0x17, 0x70, 0x72, 0x65, 0x76, 0x69, 0x6f, 0x75, 0x73, 0x45,
+	0x07, 0x20, 0x01, 0x28, 0x09, 0x52, 0x17, 0x70, 0x72, 0x65, 0x76, 0x69, 0x6f, 0x75, 0x73, 0x45,
 	0x70, 0x6f, 0x63, 0x68, 0x41, 0x63, 0x74, 0x69, 0x76, 0x65, 0x47, 0x77, 0x65, 0x69, 0x12, 0x41,
 	0x0a, 0x1d, 0x70, 0x72, 0x65, 0x76, 0x69, 0x6f, 0x75, 0x73, 0x5f, 0x65, 0x70, 0x6f, 0x63, 0x68,
 	0x5f, 0x61, 0x74, 0x74, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x67, 0x5f, 0x67, 0x77, 0x65, 0x69, 0x18,
-	0x08, 0x20, 0x01, 0x28, 0x04, 0x52, 0x1a, 0x70, 0x72, 0x65, 0x76, 0x69, 0x6f, 0x75, 0x73, 0x45,
+	0x08, 0x20, 0x01, 0x28, 0x09, 0x52, 0x1a, 0x70, 0x72, 0x65, 0x76, 0x69, 0x6f, 0x75, 0x73, 0x45,
 	0x70, 0x6f, 0x63, 0x68, 0x41, 0x74, 0x74, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x67, 0x47, 0x77, 0x65,
 	0x69, 0x12, 0x4e, 0x0a, 0x24, 0x70, 0x72, 0x65, 0x76, 0x69, 0x6f, 0x75, 0x73, 0x5f, 0x65, 0x70,
 	0x6f, 0x63, 0x68, 0x5f, 0x74, 0x61, 0x72, 0x67, 0x65, 0x74, 0x5f, 0x61, 0x74, 0x74, 0x65, 0x73,
-	0x74, 0x69, 0x6e, 0x67, 0x5f, 0x67, 0x77, 0x65, 0x69, 0x18, 0x09, 0x20, 0x01, 0x28, 0x04, 0x52,
+	0x74, 0x69, 0x6e, 0x67, 0x5f, 0x67, 0x77, 0x65, 0x69, 0x18, 0x09, 0x20, 0x01, 0x28, 0x09, 0x52,
 	0x20, 0x70, 0x72, 0x65, 0x76, 0x69, 0x6f, 0x75, 0x73, 0x45, 0x70, 0x6f, 0x63, 0x68, 0x54, 0x61,
 	0x72, 0x67, 0x65, 0x74, 0x41, 0x74, 0x74, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x67, 0x47, 0x77, 0x65,
 	0x69, 0x12, 0x4a, 0x0a, 0x22, 0x70, 0x72, 0x65, 0x76, 0x69, 0x6f, 0x75, 0x73, 0x5f, 0x65, 0x70,
 	0x6f, 0x63, 0x68, 0x5f, 0x68, 0x65, 0x61, 0x64, 0x5f, 0x61, 0x74, 0x74, 0x65, 0x73, 0x74, 0x69,
-	0x6e, 0x67, 0x5f, 0x67, 0x77, 0x65, 0x69, 0x18, 0x0a, 0x20, 0x01, 0x28, 0x04, 0x52, 0x1e, 0x70,
+	0x6e, 0x67, 0x5f, 0x67, 0x77, 0x65, 0x69, 0x18, 0x0a, 0x20, 0x01, 0x28, 0x09, 0x52, 0x1e, 0x70,
 	0x72, 0x65, 0x76, 0x69, 0x6f, 0x75, 0x73, 0x45, 0x70, 0x6f, 0x63, 0x68, 0x48, 0x65, 0x61, 0x64,
 	0x41, 0x74, 0x74, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x67, 0x47, 0x77, 0x65, 0x69, 0x22, 0xad, 0x03,
 	0x0a, 0x0d, 0x56, 0x61, 0x6c, 0x69, 0x64, 0x61, 0x74, 0x6f, 0x72, 0x49, 0x6e, 0x66, 0x6f, 0x12,
diff --git a/proto/prysm/v1alpha1/validator.proto b/proto/prysm/v1alpha1/validator.proto
index 80e5e1eb7..c4dca5dcf 100644
--- a/proto/prysm/v1alpha1/validator.proto
+++ b/proto/prysm/v1alpha1/validator.proto
@@ -665,24 +665,24 @@ message ValidatorParticipation {
     // contains a value between 0 and 1.
     float global_participation_rate = 1  [deprecated = true];
     // The total amount of ether, in gwei, that has been used in voting.
-    uint64 voted_ether = 2 [deprecated = true];
+    string voted_ether = 2 [deprecated = true];
     // The total amount of ether, in gwei, that is eligible for voting.
-    uint64 eligible_ether = 3 [deprecated = true];
+    string eligible_ether = 3 [deprecated = true];
     // Total staked gwei that was active (i.e. eligible to vote) during the current epoch.
-    uint64 current_epoch_active_gwei = 4;
+    string current_epoch_active_gwei = 4;
     // Total staked gwei that had attestations included in a block during the current epoch,
     // attestations by the same validator do not increase this figure.
-    uint64 current_epoch_attesting_gwei = 5;
+    string current_epoch_attesting_gwei = 5;
     // Total staked gwei that attested to the majority-elected Casper FFG target epoch during the current epoch.
-    uint64 current_epoch_target_attesting_gwei = 6;
+    string current_epoch_target_attesting_gwei = 6;
     // Same as current_epoch_active_gwei but for previous epoch.
-    uint64 previous_epoch_active_gwei = 7;
+    string previous_epoch_active_gwei = 7;
     // Same as current_epoch_attesting_gwei but for previous epoch.
-    uint64 previous_epoch_attesting_gwei = 8;
+    string previous_epoch_attesting_gwei = 8;
     // Same as current_epoch_target_attesting_gwei but for previous epoch.
-    uint64 previous_epoch_target_attesting_gwei = 9;
+    string previous_epoch_target_attesting_gwei = 9;
     // Total staked gwei that attested to a head beacon block that is in the canonical chain.
-    uint64 previous_epoch_head_attesting_gwei = 10;
+    string previous_epoch_head_attesting_gwei = 10;
 }
 
 // ValidatorInfo gives information about the state of a validator at a certain epoch.
diff --git a/pulse/pulse_rewards_test.go b/pulse/pulse_rewards_test.go
new file mode 100644
index 000000000..6abb1f6d7
--- /dev/null
+++ b/pulse/pulse_rewards_test.go
@@ -0,0 +1,123 @@
+package pulse_test
+
+import (
+	"context"
+	"math/big"
+	"testing"
+
+	"github.com/prysmaticlabs/go-bitfield"
+	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/altair"
+	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/helpers"
+	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/signing"
+	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/time"
+	p2pType "github.com/prysmaticlabs/prysm/v5/beacon-chain/p2p/types"
+	"github.com/prysmaticlabs/prysm/v5/config/params"
+	types "github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
+	"github.com/prysmaticlabs/prysm/v5/crypto/bls"
+	ethpb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/v5/testing/require"
+	"github.com/prysmaticlabs/prysm/v5/testing/util"
+	"github.com/prysmaticlabs/prysm/v5/time/slots"
+)
+
+func TestPulseChainValidatorRewardsMock(t *testing.T) {
+	cfg := params.MainnetConfig()
+	cfg.BaseRewardFactor = 780000
+	cfg.MinDepositAmount = 16000000000000000
+	cfg.MaxEffectiveBalance = 32000000000000000
+	params.OverrideBeaconConfig(cfg)
+	// Vars
+	numOfVals := uint64(18312)
+	slotsPerEpoch := uint64(32)
+	amountOfEpochsToProcess := 5
+
+	// Generate genesis Beaconchain state with required num of vals and deposit amounts
+	beaconState, privKeys := util.DeterministicGenesisStateBellatrix(t, numOfVals)
+	validators, balance, err := altair.InitializePrecomputeValidators(context.Background(), beaconState)
+	require.NoError(t, err)
+
+	// Generate perfect participation object
+	// All validators are participating 100% meaning no penalties accounted
+	participation := make([]byte, numOfVals)
+	inds := make([]uint64, numOfVals)
+	for i := 0; i < len(participation); i++ {
+		participation[i] = generateParticipation(params.BeaconConfig().TimelySourceFlagIndex, params.BeaconConfig().TimelyTargetFlagIndex, params.BeaconConfig().TimelyHeadFlagIndex)
+		inds[i] = uint64(i)
+	}
+
+	// Loop for simulating slot progression
+	// Sync rewards being processed per each slot
+	// Epoch rewards being processed per each epoch
+	var slotCounter uint64
+	for i := 0; i < int(slotsPerEpoch)*amountOfEpochsToProcess; i++ {
+		// Progress 1 slot each itteration
+		require.NoError(t, beaconState.SetSlot(types.Slot(i+1)))
+		slotCounter++
+
+		// Assign sync committee
+		committee, err := altair.NextSyncCommittee(context.Background(), beaconState)
+		require.NoError(t, err)
+		require.NoError(t, beaconState.SetCurrentSyncCommittee(committee))
+
+		// Define signatures
+		syncBits := bitfield.NewBitvector512()
+		for i := range syncBits {
+			syncBits[i] = 0xff
+		}
+		indices, err := altair.NextSyncCommitteeIndices(context.Background(), beaconState)
+		require.NoError(t, err)
+		ps := slots.PrevSlot(beaconState.Slot())
+		pbr, err := helpers.BlockRootAtSlot(beaconState, ps)
+		require.NoError(t, err)
+		sigs := make([]bls.Signature, len(indices))
+		for i, indice := range indices {
+			b := p2pType.SSZBytes(pbr)
+			sb, err := signing.ComputeDomainAndSign(beaconState, time.CurrentEpoch(beaconState), &b, params.BeaconConfig().DomainSyncCommittee, privKeys[indice])
+			require.NoError(t, err)
+			sig, err := bls.SignatureFromBytes(sb)
+			require.NoError(t, err)
+			sigs[i] = sig
+		}
+		aggregatedSig := bls.AggregateSignatures(sigs).Marshal()
+		syncAggregate := &ethpb.SyncAggregate{
+			SyncCommitteeBits:      syncBits,
+			SyncCommitteeSignature: aggregatedSig,
+		}
+
+		// Process Sync aggregation and process rewards
+		beaconState, _, err = altair.ProcessSyncAggregate(context.Background(), beaconState, syncAggregate)
+		require.NoError(t, err)
+
+		// If epoch passed - process participation and rewards
+		if slotCounter == 32 {
+			slotCounter = 0
+			require.NoError(t, beaconState.SetCurrentParticipationBits(participation))
+			require.NoError(t, beaconState.SetPreviousParticipationBits(participation))
+			validators, balance, err = altair.ProcessEpochParticipation(context.Background(), beaconState, balance, validators)
+			require.NoError(t, err)
+			beaconState, err = altair.ProcessRewardsAndPenaltiesPrecompute(beaconState, balance, validators)
+			require.NoError(t, err)
+		}
+	}
+
+	// Count total rewards after simulation
+	var totalRewards *big.Int = big.NewInt(0)
+	bal := beaconState.Balances()
+	for i := 0; i < len(bal); i++ {
+		totalRewards.Add(totalRewards, new(big.Int).Sub(new(big.Int).SetUint64(bal[i]), new(big.Int).SetUint64(cfg.MaxEffectiveBalance)))
+	}
+	t.Log("totalRewards:", totalRewards)
+}
+
+// Helper function to generate participation
+func generateParticipation(flags ...uint8) byte {
+	b := byte(0)
+	var err error
+	for _, flag := range flags {
+		b, err = altair.AddValidatorFlag(b, flag)
+		if err != nil {
+			return 0
+		}
+	}
+	return b
+}
diff --git a/validator/client/metrics.go b/validator/client/metrics.go
index 69462d50a..e7400f110 100644
--- a/validator/client/metrics.go
+++ b/validator/client/metrics.go
@@ -338,9 +338,9 @@ func (v *validator) logForEachValidator(index int, pubKey []byte, resp *ethpb.Va
 			"correctlyVotedSource":    correctlyVotedSource,
 			"correctlyVotedTarget":    correctlyVotedTarget,
 			"correctlyVotedHead":      correctlyVotedHead,
-			"startBalance":            startBalance,
-			"oldBalance":              prevBalance,
-			"newBalance":              newBalance,
+			"startBalance":            fmt.Sprintf("%f", startBalance),
+			"oldBalance":              fmt.Sprintf("%f", prevBalance),
+			"newBalance":              fmt.Sprintf("%f", newBalance),
 			"percentChange":           fmt.Sprintf("%.5f%%", percentNet*100),
 			"percentChangeSinceStart": fmt.Sprintf("%.5f%%", percentSinceStart*100),
 		}