Old Capacitor is an unlockable trinket in The Binding of Isaac, added in the Repentance DLC.

Prevents active items from charging normally when clearing rooms.

Adds a 20% luck-based chance to spawn a Lil' Battery when clearing a room, alongside the original drop.

The chance to spawn a battery is equal to 20% + 3% × LuckStat, starting at 20% with 0 luck, but maxing out at 33% with 4.34 luck.

The room must drop a clear reward in order for the chance to apply.

This page shows the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this trinket for the previous Repentance version, check this page instead.

Kill 10 Battery Bums.

The following tags are applied to this trinket:

The following special synergies and interactions for Old Capacitor have been documented.

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

Below is the Internal Item Description as shown in-game.
Note that some stat changes are not displayed here. Please see the main description for the full effects.

Old Capacitor

• Active items no longer gain charge from completing rooms
• 20% chance to spawn a lil' battery as a room-clear reward
• Chance increases with luck
• Golden Trinket (without Mom's Box): 33% chance to spawn a lil' battery as a room-clear reward
• Mom's Box: 33% chance to spawn a lil' battery as a room-clear reward
• Mom's Box + Golden Trinket: 33% chance to spawn a lil' battery as a room-clear reward

• Check out the trinket description on the external Isaac Wiki.