Fusion core (Fallout 4)

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For an overview of Fusion cores throughout the Fallout series, see Fusion core.
Fusion Core
FusionCoreFO4.pngFo4FusionCore 2.png
1 ~ 100
Editor IDAmmoFusionCore

Fusion cores are an ammunition type in Fallout 4.


Standardized fusion cores are a high-grade, long-term nuclear battery used for military and commercial applications before the Great War.[1] Used by civilians to power a multitude of devices, from automobiles,[2] to generators,[3] the military instead used them for killing, supplying power armor and some Gatling laser models with energy. Standard core interfaces were developed across the board to allow for power armor frames to use cores salvaged from weapons or generators.[4] The Fusion Core also can be hooked up to certain melee weapons via jumper cables.[5] A specialized variant of the fusion core was developed as well, for use in plasma weapons.[6]

Another benefit is that cores can be set to overload, for use as improvised explosives or to deny a power armor suit to the enemy by destroying it.[7]


Fusion cores denote their charge with a value of 1 to 100; the more the cell is used, the lower the charge becomes. Power armor runs on fusion cores. Performing any of the following actions will reduce a core's charge:

  • Running
  • Sprinting
  • Power Attacks
  • V.A.T.S.

Once the fusion core has been emptied, you will move at a reduced rate and will be unable to Power Attack or use V.A.T.S. If the player has another fusion core in their inventory when the current core runs out, it will automatically be installed in the suit. Otherwise, another core needs to be found to restore the power armor's functionality or the suit must be abandoned.

Weapons using this ammunition

The only other item that uses fusion cores as ammunition is the Gatling Laser (Fallout 4).


  • Fusion cores can often be found in old generators throughout the Commonwealth or purchased from merchants.
  • Pre-War military checkpoints, scattered throughout the Commonwealth.[8]
  • Four fusion cores can be found in Diamond City, in the secret room in Kellogg's house.
  • One fusion core is the reward of Here, Kitty Kitty.
  • In the shed of the lake wedding setup remains place thing... the unmarked location next to Southwest Harbor yet the closest map marker is the Old Pond House... across from the chemistry station on a barrel...


  1. The Sole Survivor: "I'll help if I can."
    Preston Garvey: "What you'll need is an old pre-war F.C., a standardized Fusion Core. Your high-grade, long-term nuclear battery. Used by the military and some companies, way back when. And we know right where to find one..."
    Sturges: "But we can't get to the damn thing. It's down in the basement, locked behind a security gate. Look... I fix stuff. I tinker. Bypassing security ain't exactly my forte. You could give it a shot."
    (Preston Garvey's and Sturges' dialogue)
  2. Berkeley Springs terminals; Dr. Barnaby's Terminal, Medical Notes 10.31.77
  3. The Sole Survivor: "What're you looking for again?"
    Preston Garvey: "A Fusion Core. It's kind of a fancy battery. They used one here in the museum to power the exhibits, a long time ago. There's one in the basement, behind a security gate. You'll need to pick the lock or hack the computer to open it."
    (Preston Garvey's dialogue)
  4. Sturges: "That armor may be old, but it's got a standard interface. Just jack the Fusion Core in."
    (Sturges' dialogue)
  5. Electro-Fusion modification for the Hatchet
  6. Plasma core in Fallout 76
  7. The Sole Survivor: “The damage... it's deliberate. They set the fusion cores in their armor to overload. That's what caused the blast. But why?
    Spoken during The Lost Patrol
  8. Fallout 4 loading screen hints: "Pre-war military checkpoints, scattered throughout the Commonwealth, are a great place to find Fusion Cores."