Binding of Isaac: Rebirth Wiki

Added in Afterbirth

Car Battery is a passive item added in The Binding of Isaac: Afterbirth.



  • Added in Afterbirth †Broken Shovel Broken Shovel: Prevents the Mom's Foot from appearing for two rooms (empty or not), or for two waves of a Challenge Room or the Boss Rush, essentially removing the stomping attacks for the entire duration of the Boss Rush
  • Added in Afterbirth † / Removed in RepentanceCrooked Penny Crooked Penny: Splits the 50% chance to succeed into a 25% chance to quadruple all items and a 25% chance to duplicate all items while consuming the originals; the latter will make Devil deal and Shop items free.
    • Added in Repentance The 25% chance to duplicate all items while consuming the originals now generates 2 pennies instead.
  • Added in RepentanceSulfur Sulfur: Will count as giving double Brimstone, giving extra damage and a x1.2 damage multiplier for the current room.
  • Added in Afterbirth †Void Void: Doubles effects of all absorbed activated items. Absorbing passives will not give extra stat ups.
  • Wooden Nickel Wooden Nickel: 25% chance to spawn nothing, 50% chance to spawn one coin, and 25% chance to spawn two coins.


  • Added in RepentanceBerserk! Berserk!: Will only increase rage duration if no enemies are killed in the first half, effectively only affecting bosses that can't spawn enemies.
  • Added in RepentanceBook of Virtues Book of Virtues: Doubles the spawned wisps on activation.
  • Book of Secrets Book of Secrets: Activates twice, Removed in Repentance but has a chance to uselessly activate the same effect twice.
  • Book of Shadows Book of Shadows/The Gamekid The Gamekid/My Little Unicorn My Little Unicorn/Unicorn Stump Unicorn Stump: Doubles the length of invincibility, but no effect on damage where applicable.
  • Added in Afterbirth †Clicker Clicker: If the Car Battery is removed by the first activation, a second activation will not happen. Two activations in a row is mostly detrimental, removing two items and possibly cycling through a character that lowers health.
  • Added in RepentanceSpindown Dice Spindown Dice: Lowers ID by 2, good for some items, bad for others.
  • Added in RepentanceDark Arts Dark Arts: Doubles the duration, giving more time to walk through more enemies, if you end the effect before the end of the first second, the item will reactivate itself; allowing to target the same enemies twice.
  • D4 D4/D100 D100: Instantly re-rolls Isaac's items twice, which doubles the speed at which the item pools are exhausted and transformations are achieved.
    • Added in Repentance As items are returned back into the item pool when re-rolled, the item pools aren't exhausted at all. In addition, you need to actively be holding a transformation's respective items to retain them now, so using the double re-roll to gain multiple transformations is no longer possible.
  • The D6 The D6/D8 D8/D12 D12/D20 D20: Re-rolls twice instantly without any benefits. Removed in Repentance The D6 depletes item pools at double the speed.
  • D7 D7: Doubles the amount of enemies summoned, but does not give double rewards.
  • Dead Sea Scrolls Dead Sea Scrolls: Activates 2 random effects.
  • Added in Afterbirth † / Removed in RepentanceD Infinity D Infinity: Activates 2 dice. The second activation die cannot be predicted.
    • Added in Repentance Activates 2 dice. The second activation die is determined by the seed and never changes.
  • Added in Afterbirth †Dull Razor Dull Razor: The invulnerability time is not increased, but damage-triggered items will activate twice if applicable.
  • Added in RepentanceEternal D6 Eternal D6: Re-rolls twice like The D6 (see above), but the 30% chance of the item disappearing is increased to 51%.
  • Added in RepentanceEverything Jar Everything Jar: Instead of doubling its effect, Everything Jar will spawn a poop alongside its normal drop.
  • Head of Krampus Head of Krampus: Doubles the damage the brimstone beams deal (for a total of Removed in Repentance880 damage/ Added in Repentance380 damage per use). Doesn't double the brimstone beams' duration.
  • The Hourglass The Hourglass: Doubles the length of the effect.
  • Added in RepentanceMega Mush Mega Mush: Makes the effect twice as long.
  • Removed in Afterbirth †Mine Crafter Mine Crafter: Spawns a Movable TNT and instantly detonates it, damaging Isaac.
    • Added in Afterbirth † This has been changed to spawn two Movable TNT barrels instead, which you can detonate at will.
  • Added in Afterbirth †Moving Box Moving Box: Activation swaps the contents of the box with the contents of the room.
    • Added in Repentance This has been changed to have have no effects.
  • Spider Butt Spider Butt: Deals 10 damage to enemies twice but does not increase slow effect.
  • Added in RepentanceStitches Stitches: Swaps places with Isaac twice in quick succession, rendering Stitches useless for collecting pickups & items beyond pits, rocks etc.
    • However, it can still be used to telefrag enemies.
  • The Bean The Bean/Mega Bean Mega Bean/Kidney Bean Kidney Bean: Deals double damage, but charms/poisons/petrifies for the same amount of time.
  • Tear Detonator Tear Detonator: Multiplies detonated tears, resulting in 6x more tears than normal.
  • Added in Afterbirth †Telekinesis Telekinesis doubles the duration of the effect, with 6 sec. of use and 6 sec. of charge time
  • Added in RepentanceThe Scooper The Scooper: Will summon 2 peepers in a bifurcated direction
  • Ventricle Razor Ventricle Razor: Places both trapdoors in same location.
    • Added in Afterbirth † Ventricle Razor works normally.

No Effect[]


  • Having more than one Car Battery has no effect.


  • Removed in Repentance Prior to Repentance, Car Battery's description was "Double charge!"

In-game Footage[]

Unlockable Achievements[]


PC A188 W1Q8 (First floor Shop)

Switch Q1ZZ ETS0 (Starting item as Eden)


Bug Bug! Added in Afterbirth † / Removed in Repentance Mr. ME! Mr. ME!: Grabbed items and pickups may become ghostly and impossible to pick up. Leaving the room and returning fixes this.

Bug! Tainted Lazarus: using Flip as Tainted Lazarus activates flip twice. Character remains same in room, and flipped items are unable to be picked up. Leaving the room and returning fixes this.