Battery Acid is an unlockable active item in The Bimbing of AIsaac: Reedged, a mod for The Binding of Isaac.

While held If it has 1-2 charges, it doubles any non-self damage Isaac takes.

If has 3+ charges, blocks any non-self damage Isaac takes, giving him a lot of invulnerability frames and discharging the item by 3.

On use If it has less than 3 charges, it completely discharges itself.

If it has 3-5 charges, spawns a puddle of acid-shooting tears that deal 3.5 damage. Discharged by 3.

If it has 6+ charges, spawns a much bigger puddle with a higher fire rate. Enemies killed by this puddle have a 10% chance to drop a Micro Battery on death. Discharged by 6.

Puddles last infinite, or only 5 seconds in rooms with bosses.

Defeat The Lamb as AIsaac.

Battery Acid can be found in the following item pools:

The following special synergies and interactions for Battery Acid have been documented.

* Note that not all possible synergies and interactions are listed here.

This item is a reference to Queen from Deltarune.
Its unlock paper is a reference to a fanart of AIsaac and Queen.

• Download The Bimbing of AIsaac: Reedged from the Steam Workshop.