Battery Acid is an unlockable active item in The Bimbing of AIsaac, 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:
| Name | Weight |
|---|---|
| Treasure Room |
1.0/1.0
|
| Greed Treasure Room |
1.0/1.0
|
| Battery Bum |
1.0/1.0
|
The following special synergies and interactions for Battery Acid have been documented.
| Mod | Item | Synergy |
|---|---|---|
| --- | Mysterious Liquid | Puddle fire rate×2. |
| --- | Sulfuric Acid | Makes the puddle yellow, its tears can break obstacles. |
| --- | Chemical Peel | 50% of puddle tears have +2 damage. |
| The Bimbing of AIsaac | AIsaac |
Using the item heals half a heart for every 3 charges used. |
| --- | Book of Virtues | Spawns whisps in the outer ring. Spawns 1 wisp for every charge used. Blocking damage is also considered as using the item. |
| --- | The Book of Belial combined with Judas' Birthright | The puddle from the item is red. Blocking damage spawns Charges+1 flames around Judas. |
* Note that not all possible synergies and interactions are listed here.