Watch Battery
TrinketAfterbirthUnlocked
How do you unlock Watch Battery?
Verified starting unlockSource data confirms that no unlock is required.
Increased chance of Lil' Battery spawning. Has a chance to add an extra charge to Isaac's activated item upon completing a room.
Available from the start
No unlock needed — this is available in every new save file.
What unlocking Watch Battery leads to
Nothing depends on this yet.
Source: bindingofisaacrebirth.wiki.gg
Imported 2026-09-13