The Binding of Isaac Wiki
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Not to be confused with the passive item, 9 Volt.

The Battery is a passive item.

It is a silver battery with a lightning bolt on it.

Effects

Gives Isaac an extra charge for his Activated Item every 15 seconds per room, up to a maximum of three charges. Using an item will reset the counter and let Isaac charge a maximum of six bars per room. The charging only happens as long as there are enemies in a room.

Notes

  • Typically, the final (third) charge of the battery will be silent.
  • Additional item charges can be farmed at a rate of three item charges per Bomb using the following method:
    • Enter a room with enemies and wait for the battery to give you three charges. Enemies can be killed, but leave at least one enemy alive so that the room is not completed
    • Exit the room using a Bomb, being careful not to kill the remaining enemy(ies).
    • Now re-enter the room and repeat the process.
  • This means if Isaac have a way to exit the room indefinitely (such as using Dr. Fetus or Epic Fetus), he is, with the help of The Dice, able to re-roll items with no limits.

Interactions

  • If used in conjunction with X-Ray Vision, this allows an infinite use of the activated item by running between incomplete rooms and the secret room. This can also be done with Dr. FetusEpic Fetus or Ipecac by blowing up the door of an uncompleted room and going in and out again. Using the Book of Revelations or The Nail for example can provide unlimited Soul Hearts. However, neither of these exploits will work in The Chest.

Synergies

  • The Battery synergizes very poorly with items such as the Dead Bird and the Cube of Meat because they will prevent the player from waiting for items to charge.
  • 9 Volt - Allows for rapid use of held items.

Trivia

  • When possessed, Isaac has the bolts of the monster from Frankenstein in his neck.

Bugs

  • Occasionally when Isaac purchase the battery from the shop, he can die randomly.
Items
Passive Items
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Boom!TranscendenceThe CompassLunchDinnerDessertBreakfastRotten MeatWooden SpoonPHD


The BeltMom's UnderwearMom's HeelsMom's LipstickWire Coat HangerRosaryXRay VisionLucky FootCupid's ArrowSteven


PentagramDr. FetusMagnetoTreasure MapMom's EyeDistant AdmirationWiggle WormThe LadderCharm Of The VampireThe Mark


The BatterySteam SaleSister MaggyTechnologyChocolate MilkGrowth HormonesMini MushroomThe PactDead CatLord Of The Pit


Loki's HornsLittle ChubbySpider's BiteSmall RockSpelunker HatSuper BandageSack Of PenniesRobo-BabyLittle C.H.A.D.The Relic


Little GishLittle SteveThe HaloThe Common ColdThe ParasiteMr. MegaThe WaferMoney Equals PowerMom's ContactsGuardian Angel


Demon BabyMom's KnifeOuija Board9 VoltDead BirdBrimstoneBlood BagOdd Mushroom (Thin)Odd Mushroom (Large)Whore Of Babylon


Bobby-BombForever AloneBucket Of LardBomb BagA Lump of Coal


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Celtic CrossGhost BabyCat-O-Nine-TailsHarlequin BabyEpic FetusPolyphemusDaddy LonglegsSacrificial DaggerMitreRainbow Baby


Stem CellsHoly WaterFateThe Black BeanSacred HeartTooth PicksHoly GrailDead DoveGuppy's Hair BallAbel


SMB Super Fan!Pyro3 Dollar BillMEAT!Magic 8 BallMom's Coin PurseSqueezyJesus JuiceBox
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The BibleThe Book of BelialThe NecronomiconThe PoopMr. BoomTammy's HeadMom's BraKamikazeMom's PadBob's Rotten Head


Teleport!My Little UnicornYum HeartDoctor's RemoteShoop Da Whoop!Book Of RevelationsLemon MishapBook of ShadowsAnarchist CookbookThe Hourglass


The NailWe Need To Go Deeper!Deck of CardsMonstro's ToothThe GamekidThe Book Of SinMom's Bottle of PillsThe DiceThe Pinking ShearsThe Bean


Monster ManuelDead Sea ScrollsRazor BladeForget Me NowA Pony


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D20Spider ButtDad's KeyPortable SlotWhite PonyBlood RightsTelepathy for Dummies
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