The Battery

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The Battery is a passive item.

Effects

• Active items can store an extra level of charge, allowing them to be used twice in one room.
  • Extra charges appear in yellow over the normal charge meter.

Notes

• The Battery does not affect self-recharging activated items.
  • Self-recharging active items can charge the yellow meter, allowing Isaac to use them twice immediately.

Synergies

• 48 Hour Energy! Pill: A fully discharged item will be doubly charged, along with spawning 1 or 2 Lil' Battery pickups.

Unlockable achievements

• 

  Extension Cord - Have The Battery, 9 Volt, and Car Battery in your collection.

• 

  Jumper Cables - Pick up any 3 of the following items/trinkets in a single run: 9 Volt, The Battery, Car Battery, AAA Battery, Watch Battery.

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

Items:

• The BatteryActivated Items can be "overcharged" to allow for an additional use.
• Car BatteryCauses Isaac's activated item to activate twice on each use.
• Sharp PlugUsing an activated item while it's not charged will charge it and Sharp Plug does 2 full heart damage to Isaac.
• VoidConsumes all pedestal items in the room. Active items will have their effects added to Void, and passive items will grant stat upgrades.

Trinkets:

• Broken RemoteTriggers the Teleport effect whenever an activated item is used.
• Butter!Using an active item will drop it onto a pedestal on the ground. Taking damage may result in dropping a passive item.
• Dim BulbProvides a boost to all stats when Isaac's active item is completely uncharged.
• Vibrant BulbProvides a boost to all stats when Isaac's active item is fully charged.

Cards:

• ? CardWhen used, copies the effect of Isaac's currently held activated collectible item.

Batteries

Items:

• 9 VoltReduces the charge of any Activated Items by 1. Any 1 charge items instead have timed recharges.
• The BatteryActivated Items can be "overcharged" to allow for an additional use.
• Car BatteryCauses Isaac's activated item to activate twice on each use.
• Charged BabyA familiar that drops a Little Battery every 4 rooms. Has a small chance to freeze all enemies in the room when hit.

Trinkets:

• AAA BatteryAutomatically recharges the last energy slot of an activated item, effectively reducing recharge rates by one.
• Watch BatteryIncreased chance of batteries spawning. Has a chance to add an extra charge to Isaac's activated item upon completing a room.