The Battery
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This article is about the item. For the pickup, see Batteries. For other uses, see Battery (Disambiguation).
The Battery is a passive item.
Effects
- Activated items can be overcharged, allowing them to store up to one extra use.
- Extra charges appear in yellow over the normal charge meter.
Notes
The Battery does not affect self-recharging activated items.
Picking up a 
Lil' Battery while the held activated item's main charge bar isn't full will only fill the main charge bar without adding overcharge.
Synergies
- 48 Hour Energy pill: A fully discharged item will be doubly charged, along with spawning 1 or 2 Lil'Batteries.
AAA Battery: If Isaac's active item would have at least one full charge upon clearing a room, it gains two charges.
Friendly Ball: Walking over a captured enemy will double charge the ball, allowing the enemy to be released, and allowing to catch a new one in the same room, and the process repeats. Trying to catch a new enemy while the old one hasn't spawned yet will have no effect.-
Jacob's Ladder / 
120 Volt: Increases the amount of arcs a spark can generate. -
Notched Axe: Causes remaining charge from the previous floor to carry over to the next one.
In-game footage
Unlockable Achievements
Jumper Cables - Pick up any 2 of the following items/trinkets in a single run: 
9 Volt, 
The Battery, 
Car Battery, AAA Battery, and 
Watch Battery ( Any 2 items that have the 'battery' item tag).
Trivia
- This item is used in It's in the Cards (challenge #14).
- The screws that appear in Isaac's head may be a reference to Frankenstein's Monster.
- The effect of this item was completely changed from the original Binding of Isaac.
 Active Item Modifiers
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| Items |
| Trinkets |
| Cards |
 Batteries
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| Items |
| Trinkets |
 The Binding of Isaac: Rebirth
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