Binding of Isaac: Rebirth Wiki
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(except in Rebirth)

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

Effect[ | ]

Notes[ | ]

  • Having more than one Car Battery has no effect.

Synergies[ | ]

  • Collectible Best Friend iconBest Friend: Spawns two decoys on top of each other.
  • Collectible Blank Card iconBlank Card: Uses the card twice. For example, if used with the Two of Hearts/Diamonds/etc. cards it will quadruple whatever amount Isaac has.
    • Blank Card + Tarot Cloth: The effect of the active card is quadrupled.
  • (in Afterbirth † and Repentance)Collectible Broken Shovel 1 iconBroken Shovel: Prevents the Mom's Foot from appearing for two rooms (empty or not), or for two waves of a Challenge RoomChallenge Room or the Boss RushBoss Rush, essentially removing the stomping attacks for the entire duration of the Boss Rush.
  • (in Repentance)Collectible Isaac's Tears iconIsaac's Tears: The damage of tears shot from the active item is doubled.
  • Collectible Kamikaze! iconKamikaze!: Now causes smaller explosions in a ring around Issac.
  • (in Afterbirth † and Repentance)Collectible Jacob's Ladder iconJacob's Ladder / (in Repentance)Collectible 120 Volt icon120 Volt: Electricity deals 75% of Isaac's tear damage if he owns 1 of these items, to 100% if Isaac owns both.
  • (in Afterbirth †)Collectible Crooked Penny iconCrooked 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.
    • (in Repentance) The 25% chance to duplicate all items while consuming the originals now generates 2 pennies instead.
  • (in Repentance)Collectible Sulfur iconSulfur: Will count as giving double Brimstone, giving extra damage and a x1.2 damage multiplier for the current room.
  • (in Afterbirth † and Repentance)Collectible Void iconVoid: Applies Car Battery's effect on all eligible absorbed active items. Absorbing passives will not give extra stat ups.

Interactions[ | ]

  • Collectible The Bean iconThe Bean/Collectible Mega Bean iconMega Bean/Collectible Kidney Bean iconKidney Bean: Deals double damage, but charms/poisons/petrifies for the same amount of time.
  • (in Repentance)Collectible Berserk! iconBerserk!: Will only increase rage duration if no enemies are killed in the first half, effectively only affecting bosses that can't spawn enemies.
  • (in Repentance)Collectible Book of Virtues iconBook of Virtues: Doubles the spawned wisps on activation.
  • Collectible Book of Secrets iconBook of Secrets: Activates twice, (except in Repentance) but has a chance to uselessly activate the same effect twice.
  • Collectible Book of Shadows iconBook of Shadows/Collectible The Gamekid iconThe Gamekid/Collectible My Little Unicorn iconMy Little Unicorn/Collectible Unicorn Stump iconUnicorn Stump: Doubles the length of invincibility, but no effect on damage where applicable.
  • (in Afterbirth † and Repentance)Collectible Clicker iconClicker: 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.
  • (in Repentance)Collectible Dark Arts iconDark 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.
  • Collectible D4 iconD4/Collectible D100 iconD100: Instantly re-rolls Isaac's items twice, which doubles the speed at which the item pools are exhausted and transformations are achieved.
    • (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.
  • Collectible The D6 iconThe D6/Collectible D8 iconD8/Collectible D12 iconD12/Collectible D20 iconD20: Re-rolls twice instantly without any benefits. (except in Repentance) The D6 depletes item pools at double the speed.
  • Collectible D7 iconD7: Doubles the amount of enemies summoned, but does not give double rewards.
  • Collectible Dead Sea Scrolls iconDead Sea Scrolls: Activates 2 random effects.
  • (in Afterbirth †)Collectible D infinity iconD infinity: Activates 2 dice. The second activation die cannot be predicted.
    • (in Repentance) Activates the currently selected die twice.
  • (in Afterbirth † and Repentance)Collectible Dull Razor iconDull Razor: The invulnerability time is not increased, but damage-triggered items will activate twice if applicable.
  • (in Repentance)Collectible Eternal D6 iconEternal D6: Re-rolls twice like The D6 (see above), but the 30% chance of the item disappearing is increased to 51%.
  • (in Repentance)Collectible Everything Jar iconEverything Jar: Instead of doubling its effect, Everything Jar will spawn a poop alongside its normal drop.
  • Collectible Guppy's Head iconGuppy's Head: Increases range of flies spawned to 4-7.
  • Collectible Head of Krampus iconHead of Krampus: Doubles the damage the brimstone beams deal (for a total of (except in Repentance)880 damage/ (in Repentance)400 damage per use). Doesn't double the brimstone beams' duration.
  • Collectible The Hourglass iconThe Hourglass: Doubles the length of the effect.
  • (in Repentance)Collectible Mega Mush iconMega Mush: Makes the effect twice as long.
  • (in Afterbirth † and Repentance)Collectible Metronome iconMetronome: Metronome is activated twice at once as expected, but the item chosen for the first activation is shown raised above Isaac's head, instead of the second one that actually remains active.
    • Moreover, active item effects chosen by Metronome are only activated once.
  • (in Rebirth and Afterbirth)Collectible Mine Crafter iconMine Crafter: Spawns a Movable TNT and instantly detonates it, damaging Isaac.
    • (in Afterbirth † and Repentance) This has been changed to spawn two Movable TNT barrels instead, which you can detonate at will.
  • (in Afterbirth † and Repentance)Collectible Moving Box iconMoving Box: Activation swaps the contents of the box with the contents of the room.
    • (in Repentance) This has been changed to have have no effects.
  • (in Repentance)Collectible The Scooper iconThe Scooper: Will summon 2 peepers in a bifurcated direction.
  • Collectible Spider Butt iconSpider Butt: Deals 10 damage to enemies twice but does not increase slow effect.
  • (in Repentance)Collectible Spindown Dice iconSpindown Dice: Lowers ID by 2.
  • (in Repentance)Collectible Stitches iconStitches: 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.
  • Collectible Tear Detonator iconTear Detonator: Multiplies detonated tears, resulting in 6x more tears than normal.
  • (in Repentance)Collectible Telekinesis iconTelekinesis: Grants 7 seconds of protection, effectively giving Isaac immunity to enemy bullets as long as the item is used immediately upon recharging.
  • (in Rebirth and Afterbirth)Collectible Ventricle Razor iconVentricle Razor: Places both trapdoors in same location.
    • (in Afterbirth † and Repentance) Ventricle Razor works normally.

No Effect[ | ]

In-game Footage[ | ]

Unlockable Achievements[ | ]

Trivia[ | ]

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

Bugs[ | ]

Bug Bug! (in Afterbirth †) Collectible Mr. ME! iconMr. ME!: Grabbed items and pickups may become ghostly and impossible to pick up. Leaving the room and returning fixes this.


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