diff --git a/scripts/verify-battle-save-normalization.mjs b/scripts/verify-battle-save-normalization.mjs
index 6c8f41d..d531375 100644
--- a/scripts/verify-battle-save-normalization.mjs
+++ b/scripts/verify-battle-save-normalization.mjs
@@ -103,6 +103,8 @@ try {
     ['unknown status unit id', { battleStatuses: [{ ...validState.battleStatuses[0], unitId: 'ghost-unit' }] }],
     ['duplicate status unit kind', { battleStatuses: [validState.battleStatuses[0], { ...validState.battleStatuses[0] }] }],
     ['invalid stats shape', { battleStats: { 'liu-bei': { damageDealt: 10 } } }],
+    ['invalid stats value', { battleStats: { 'liu-bei': { ...validState.battleStats['liu-bei'], actions: 1.5 } } }],
+    ['too high stats value', { battleStats: { 'liu-bei': { ...validState.battleStats['liu-bei'], damageDealt: 1000000 } } }],
     ['unknown stats unit id', { battleStats: { 'ghost-unit': validState.battleStats['liu-bei'] } }],
     ['invalid enemy usable keys', { enemyUsableUseKeys: [1] }],
     ['malformed enemy usable key', { enemyUsableUseKeys: ['rebel-1:shout'] }],
diff --git a/src/game/state/battleSaveState.ts b/src/game/state/battleSaveState.ts
index 733ee8e..7fa714f 100644
--- a/src/game/state/battleSaveState.ts
+++ b/src/game/state/battleSaveState.ts
@@ -91,6 +91,7 @@ const maxBattleEffectLabelLength = 32;
 const maxBattleEffectTurns = 9;
 const maxBattleBuffBonus = 99;
 const maxBattleStatusPower = 99;
+const maxBattleUnitStatValue = 999999;
 const maxStatusKindsPerUnit = 2;
 const maxBattleItemStockById: Record<string, number> = {
   bean: 3,
@@ -398,6 +399,10 @@ function isValidEffectLabel(value: unknown) {
   return typeof value === 'string' && value.length > 0 && value.length <= maxBattleEffectLabelLength;
 }
 
+function isBattleUnitStatValue(value: unknown) {
+  return isIntegerInRange(value, 0, maxBattleUnitStatValue);
+}
+
 function isOptionalBuffArray(value: unknown, options: BattleSaveValidationOptions) {
   return (
     value === undefined ||
@@ -454,11 +459,11 @@ function isOptionalStatsRecord(value: unknown, options: BattleSaveValidationOpti
     ([unitId, stats]) =>
       isKnownUnitId(unitId, options) &&
       isRecord(stats) &&
-      isNonNegativeFiniteNumber(stats.damageDealt) &&
-      isNonNegativeFiniteNumber(stats.damageTaken) &&
-      isNonNegativeFiniteNumber(stats.defeats) &&
-      isNonNegativeFiniteNumber(stats.actions) &&
-      isNonNegativeFiniteNumber(stats.support)
+      isBattleUnitStatValue(stats.damageDealt) &&
+      isBattleUnitStatValue(stats.damageTaken) &&
+      isBattleUnitStatValue(stats.defeats) &&
+      isBattleUnitStatValue(stats.actions) &&
+      isBattleUnitStatValue(stats.support)
   );
 }