diff --git a/CHANGELOG.md b/CHANGELOG.md
index ad82a96850..349da4044b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 - Inject and use SignedExtensions by name from V11 metadata (V4 extrinsics only)
 - Add typings for `api.tx.*.*` - the `polkadot-types-from-chain` now also generates these
 - Remove additional V1-only derives `(staking.recentlyOffline`, `balances.nominatorsFor`)
+- Add `.isMax()` on int values, an opposite of `isZero()` (e.g. `u128`, as well as derived, e.g. `Balances`)
 
 # 1.0.1
 
diff --git a/packages/api-derive/src/balances/all.ts b/packages/api-derive/src/balances/all.ts
index 9466f3a2bf..7afa764a47 100644
--- a/packages/api-derive/src/balances/all.ts
+++ b/packages/api-derive/src/balances/all.ts
@@ -25,9 +25,11 @@ function calcBalances (api: ApiInterfaceRx, [accountId, bestNumber, [freeBalance
     // only get the locks that are valid until passed the current block
     lockedBreakdown = locks.filter(({ until }): boolean => bestNumber && until.gt(bestNumber));
 
+    const notAll = lockedBreakdown.filter(({ amount }): boolean => !amount.isMax());
+
     // get the maximum of the locks according to https://github.com/paritytech/substrate/blob/master/srml/balances/src/lib.rs#L699
-    if (lockedBreakdown.length) {
-      lockedBalance = createType(api.registry, 'Balance', bnMax(...lockedBreakdown.map(({ amount }): Balance => amount)));
+    if (notAll.length) {
+      lockedBalance = createType(api.registry, 'Balance', bnMax(...notAll.map(({ amount }): Balance => amount)));
     }
   }
 
diff --git a/packages/types/src/codec/AbstractInt.ts b/packages/types/src/codec/AbstractInt.ts
index 93c47f6bb3..ffd420df65 100644
--- a/packages/types/src/codec/AbstractInt.ts
+++ b/packages/types/src/codec/AbstractInt.ts
@@ -111,6 +111,15 @@ export default abstract class AbstractInt extends BN implements Codec {
     );
   }
 
+  /**
+   * @description True if this value is the max of the type
+   */
+  public isMax (): boolean {
+    const u8a = this.toU8a().filter((byte): boolean => byte === 0xff);
+
+    return u8a.length === (this._bitLength / 8);
+  }
+
   /**
    * @description Returns the BN representation of the number. (Compatibility)
    */
diff --git a/packages/types/src/codec/UInt.spec.ts b/packages/types/src/codec/UInt.spec.ts
index 60b6614283..37f13640c6 100644
--- a/packages/types/src/codec/UInt.spec.ts
+++ b/packages/types/src/codec/UInt.spec.ts
@@ -70,4 +70,17 @@ describe('UInt', (): void => {
       expect(test.eq('0x3039')).toBe(true);
     });
   });
+
+  describe('isMax()', (): void => {
+    it('is false where not full', (): void => {
+      expect(new UInt(registry, '0x1234', 32).isMax()).toEqual(false);
+      expect(new UInt(registry, '0xffffff', 32).isMax()).toEqual(false);
+      expect(new UInt(registry, '0x12345678', 32).isMax()).toEqual(false);
+      expect(new UInt(registry, '0xfffffff0', 32).isMax()).toEqual(false);
+    });
+
+    it('is true when full', (): void => {
+      expect(new UInt(registry, '0xffffffff', 32).isMax()).toEqual(true);
+    });
+  });
 });