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. The gatling laser also utilizes fusion cores, each core providing 500 shots. Each core provides roughly twenty minutes of power armor use based on activity; sprinting or utilizing V.A.T.S. 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.

Locations

 * One can be found in the Museum of Freedom's lowest floor, Sturges asks the player character to retrieve it, but can be taken without getting the quest nonetheless.
 * Another is in ArcJet Systems in the room where the player character can restore power to the elevators.
 * 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 mission to recover the Brotherhood holotapes in "The Lost Patrol".
 * One can be found in the office of Cambridge Polymer Labs, either by picking the master lock or successfully finishing the laboratories research.
 * Four can be found inside a locked ammo box on the second floor of the Cambridge Polymer Labs.
 * One is located in Mystic Pines (Northeast of Lexington) in a room towards the back. The door to this room is locked (Advanced) and requires 1 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.
 * Two can be found in College Square one in the building opposite the hanging man, near the wooden bridge. Go up the stairs, it's on the desk by the toolbox. Other is in a trash bin behind the building by side some kind of big eletric power black box.
 * Four can be found in the College Square subway station in the first room, in an ammo box.
 * Four can be found in the Cambridge Police Station, in one of the containers.
 * Up to five can be found in The Castle's armory (including from The 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 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.
 * Four can be found in the Revere satellite array next to Scribe Faris.
 * 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. Note if Paladin Danse is nearby - he will disapprove of this.
 * Four can be found in an ammo box in a master level locked trailer at Fiddler's Green Trailer Estates
 * 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.
 * Four can be stolen inside an ammo box from Elder Maxson's chambers
 * One can be found in the church of the Quincy ruins.
 * One can be found inside the Wreck of the FMS Northern Star.
 * Two can be found on a sentry bot inside a cage, just a short walk N/W of Somerville Place
 * One can be found south of the elevator on the bottom level at Malden center
 * One can be found behind a mag-locked door (aka unpickable; unlocked via terminal right above it) in the Mass Fusion containment shed. The area is heavily irradiated, so be sure to bring plenty of Rad-X and RadAway.
 * One can be found in The Railroad's HQ escape tunnel near the exit behind a security gate.
 * Four can be found in the abandoned town of Forest Grove marsh, on the roof of bombed out building, look for a flashing red light, the light should be visible from pretty much anywhere outside the town.
 * One can be found under the Slocum Joe's where the Railroad's old HQ is. The fusion core is best accessible from the escape tunnel.
 * There are 3 fusion cores inside Four Leaf fishpacking plant, 2 inside (one of them behind a mag-lock door) and one on the roof of the building.