Car Battery

 

"Active power up"

Item ID
5.100.356

Character Appearance

Item Pool

			Battery Bum
			Shop
			Shop

Collection Grid

(page 3, column 11, row 6)

(page 3, column 12, row 6)

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

Effect

• Causes Isaac's activated item to activate twice on each use.

Synergies

• 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.
  • Combined with items like 9 Volt or The Battery, this synergy allows Isaac to (considering he entered the Boss Rush room with a full charge) essentially remove the feet for the entire duration of the Boss Rush.
• 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.
  • The 25% chance to duplicate all items while consuming the originals now generates 2 pennies instead.
• Void: Doubles effects of all absorbed activated items. Absorbing passives will not give extra stat ups.
• Sulfur: Counts as double activation for the current room.

Interactions

• Book of Secrets: Activates twice, but has a chance to uselessly activate the same effect twice.
• Book of Shadows/ The Gamekid/ My Little Unicorn/ Unicorn Stump: Doubles the length of invincibility, but no effect on damage where applicable.
• 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.
• D4/ D100: Instantly re-rolls Isaac's items twice, which doubles the speed at which the item pools are exhausted and transformations are achieved.
• The D6/ D8/ D12/ D20: Re-rolls twice instantly without any benefits. The D6 depletes item pools at double the speed.
• D7: Doubles the amount of enemies summoned, but does not give double rewards.
• Dead Sea Scrolls: Activates 2 random effects.
• D Infinity: Activates 2 random dice. The second activation die cannot be predicted.
• Dull Razor: The invulnerability time is not increased, but damage-triggered items will activate twice if applicable.
• Eternal D6: Re-rolls twice like The D6 (see above), but the 50% chance of the item disappearing is increased to 75%.
• Head of Krampus: Doubles the damage the Brimstone beams deal to 44 (for a total of 880 damage per use). No effect on beam duration.
• The Hourglass: Doubles the length of the effect.
• Mine Crafter: Spawns a Movable TNT and instantly detonates it, damaging Isaac.
  • This has been changed to spawn two Movable TNT barrels instead, which you can detonate at will.
• Moving Box: Activation swaps the contents of the box with the contents of the room.
• Spider Butt: Doubles in damage and slow time.
• The Bean/ Mega Bean/ Kidney Bean: Deals double damage, but charms/poisons/petrifies for the same amount of time.
• Tear Detonator: Multiplies detonated tears, resulting in 6x more tears than normal.
• Ventricle Razor: Places both trapdoors in same location.
  • Ventricle Razor works normally.

No Effect

• ? Card
• Black Hole
• Blood Rights
• The Bible
• Bob's Rotten Head
• The Book of Belial
• Book of the Dead
• The Boomerang
• The Candle
• Converter
• Dad's Key
• Diplopia
• Doctor's Remote
• Eden's Soul
• Flush!
• Forget Me Now
• Friendly Ball
• Glass Cannon
• Glowing Hour Glass
• Guppy's Paw
• How to Jump
• Isaac's Tears
• IV Bag
• The Jar
• Jar of Flies
• Kamikaze!
• Lemon Mishap
• Magic Fingers
• Mama Mega!
• Mega Blast
• Mom's Bra
• Mom's Pad
• Mr. ME!
• Mystery Gift
• Notched Axe
• Pandora's Box
• Pause
• Plan C
• The Poop
• A Pony
• Portable Slot
• Potato Peeler
• Razor Blade
• Red Candle
• Remote Detonator
• Sacrificial Altar
• Shoop Da Whoop!
• Smelter
• Telekinesis
• Telepathy for Dummies
• Teleport
• Undefined
• We Need to Go Deeper!
• White Pony

Trivia

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

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.

Seeds

PC A188 W1Q8 (First floor Shop)

Switch Q1ZZ ETS0 (Starting item as Eden)

Bugs

Bug!	Mr. ME!: Grabbed items and pickups may become ghostly and impossible to pick up. Leaving the room and returning fixes this.

Active Item Modifiers

Items:

• 4.5 Volt
• 9 Volt
• The Battery
• Book of Virtues
• Car Battery
• Sharp Plug
• Void

Trinkets:

• 'M
• Broken Remote
• Butter!
• Dim Bulb
• Expansion Pack
• Old Capacitor
• Vibrant Bulb

Cards:

• ? Card

Batteries

Items:

• 4.5 Volt
• 9 Volt
• The Battery
• Battery Pack
• Car Battery
• Charged Baby

Trinkets:

• AAA Battery
• Watch Battery