Watch Battery
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Watch Battery is a trinket added in The Binding of Isaac: Afterbirth.
Effects
- Increases the chance of a
Lil' Battery pickup after clearing a room by 6.67%. - Increases the chance of random pickups being a Lil' Battery by 2%.
- Has a 5% chance to add an extra charge to Isaac's activated item upon completing a room.
Synergies
Jacob's Ladder: Increases arcing distance of sparks.
Interactions
AAA Battery: Watch Battery triggering after clearing a room will also trigger AAA Battery, provided the activated item was missing exactly 3 charges prior to clearing the room.
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).
 Batteries
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| Items |
| Trinkets |
 The Binding of Isaac: Rebirth
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