Fusion core (Fallout 4)

Fusion core is an item type in Fallout 4.

Characteristics
Fusion cores are used to power and activate pre-War suits of power armor. Each core provides roughly twenty minutes of power armor use based on AP usage; actions such as holding breath when using scoped weapons, sprinting, utilizing V.A.T.S., or Jetpack modules causes the power to drain much faster, whereas walking consumes less power and remaining stationary drains none. Fusion cores have a total charge of 100.

Fusion core lifespan can be extended by 10% by collecting the Repair bobblehead, and by up to 100% by investing points in the Nuclear Physicist perk.

The Gatling laser utilizes fusion cores as its ammunition, each core providing 500 shots. Nuclear Physicist can increase the amount of shots per core up to 1000, but the clip size will remain at 500.

Fusion cores can also be ejected from power armor suits if one has the highest level Nuclear Physicist perk and no other explosive devices are currently equipped. Ejected cores land a short distance behind the user where they act as some sort of timed mine with a destructive force similar to that of a Fatman's Mini nuke. Note that, contrary to the perk description, the cores cannot be actually thrown like regular grenades.

In addition to fixed locations below, fusion cores may also spawn in groups of four in certain ammo boxes across The Commonwealth.

Locations

 * As an active companion, Robert Joseph MacCready will frequently provide fusion cores in lieu of ammunition if he is equipped with a set of Power armor.
 * Any merchant who stocks ammo (found on the page Fallout 4 merchants) will most likely carry up to 5 at 100% charge, and may carry one or two others at lesser charge (usually 40%-90%).
 * One can be found in the Museum of Freedom's lowest floor behind a security door (Novice terminal). Sturges asks the player character to retrieve it during When Freedom Calls.
 * Another is in ArcJet Systems in the room where the player character can restore power to the elevators.
 * One can be found in the generator room in the back of Super Duper Mart.
 * One can also be found in the mole rat den under the Red Rocket truck stop.
 * Up to five can be found in Recon Bunker Theta during The Lost Patrol.
 * One can be found in the office of Cambridge Polymer Labs, either by picking the master lock or successfully finishing the laboratory's research.
 * One is located in Mystic Pines (Northeast of Lexington) in the basement. The door to the basement is locked (Expert) and requires 2 point in Locksmith perk to pick.
 * One can be found at the Starlight Drive In in the building behind the screen, with a locked (Novice) door.
 * In College Square, inside a trash bin behind the building beside an electric power black box.
 * Up to five can be found in The Castle's armory (including from Sarge sentry).
 * Three can be found at Greenetech Genetics on the top floor, two behind a security door locked at master level, and one behind a door further on locked at advanced level.
 * One can be found in a trashcan on the Southern side of the Greenetech Genetics building. [Verification requested]
 * One can be found on the main road north of Poseidon Reservoir at a military checkpoint, in a power armor.
 * One can be found east of Finch Farm, in the pump station across the river. Pass code is written on the wall, below the door.
 * Erin Combes will give one for finding Ashes in the quest Here Kitty, Kitty.
 * Two can be stolen off suits in the The Prydwen's maintenance bay by sneaking behind them (Paladin Danse will disapprove).
 * Two can be found at the lake gift shop in a suitcase during the mission where you fight a group of raiders to liberate a village.
 * One can be found inside a waystation when following Dogmeat during the Reunions quest.
 * One can be found in the church of the Quincy ruins.
 * One can be found inside the Wreck of the FMS Northern Star.
 * One can be found south of the elevator on the bottom level at Malden center
 * One can be found behind a mag-locked door (unlocked via terminal right above it) in the Mass Fusion containment shed. The area is heavily irradiated.
 * One can be found in The Railroad's HQ escape tunnel near the exit behind a security gate.
 * One can be found in the Railroad's old HQ under Slocum's Joe. The fusion core is best accessible from the escape tunnel.
 * There are three fusion cores inside Four Leaf fishpacking plant, two inside (one of them behind a mag-lock door) and one on the roof of the building.
 * One can be found in chest near the robot in the center of the Robotics Disposal Ground
 * Four can be found at Hardware Town.
 * One can be found in the eastern hut at Weston water treatment plant.
 * One can be found in the Concord Civic Access, in a dark corner opposite the small drug cache that the mirelurk guards.
 * One can be found on the southern side of the Wilson Atomatoys factory.
 * Three can be found at the Gunners plaza, two behind a novice locked door in a room on the opposite side of the elevator on the roof. One other one can be found on the center of the roof behind a door with a generator, running the fusion core.
 * One can be found in the Longneck Lukowski's Cannery in the basement area after the sewer section; be careful of mines.
 * Two can be found on a shelf inside the train cart strongroom in Goodneighbor during the quest The Big Dig.
 * One can be found within Malden Drainage, an unmarked location at the end of the canal just north of the Taffington boathouse.
 * Four can be picked up in a parking garage west of Milton General hospital. They are a part of one possible reward for completing the trap-ridden maze inside the parking garage.
 * One can be found inside Boston mayoral shelter, in a room off the basketball court with a sign above it that reads "Restricted Area".
 * One can be found in the basement of Kendall Hospital.
 * One can be found atop the roof of Atlantic Offices.
 * One can be found in a power relay under the elevated freeway just west of the South Boston military checkpoint.
 * One can be obtained for returning an Overdue book at the arcade building near the Revere Beach station for fifty tokens.
 * One is on the floor under a shelving unit at the top of the left set of stairs of Back Alley Bowling in the General Atomics Galleria

Bugs

 * Completely draining a fusion core while in power armor and having a weapon not be fully loaded at the time may cause the game to show that you have no ammo for said weapon.
 * A possible fix for this is to un-equip and re-equip the weapon. Xbox one verified, PS4 Verified.
 * Having multiple fusion cores at the same level your power armor had when you stepped into it may result in them all draining with the one in the power armor
 * It is possible while aboard The Prydwen to steal fusion cores from the knights walking around in power armor. After stealing successfully, the NPC will pull a new fusion core and repower up the armor, which you can in return, steal again. The only Knight confirmed to be able to do this indefinitely is the one guarding the helipad at Boston Airport.

Gallery
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