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 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

 * There are eleven in Hardware Town, in a box past the first two Raiders.
 * 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.
 * One is located in the basement of USAF Satellite Station Olivia. It has to be removed from the generator.
 * 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.
 * 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.
 * One can be found in College Square in the building opposite the hanging man, near the wooden bridge. Go up the stairs, it's on the desk by the toolbox.
 * Up to five can be found in The Castle's armory (including from The Sarge sentry).
 * Two can be found at Greenetech Genetics on the top floor behind a security door, locked at master level.
 * One can be found on the main road north of Poseidon Reservoir at a military checkpoint, in a power armor.
 * Three can be found at Four Leaf fishpacking plant one in a generator on the roof, one in a generator in the middle level of the building and the other behind a security gate, on a shelf.
 * Four can be found at Med-Tek research on top of the parking garage
 * 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 in a generator near the elevator that leads to Sleepwalker's place near Andrew station
 * One can be found in a generator at Federal ration stockpile
 * 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.
 * One can be found at the back of the raider camp at Roadside Pines motel in a yellow generator.
 * Two can be found on a Sentry bot (Fallout 4) inside a cage, just a short walk N/W of Somerville Place
 * One can be found in a generator at the south end of Wilson Atomatoys factory
 * One can be found in a generator at Medford Memorial hospital on the second floor in a room in the west hallway.
 * One can be found south of the elevator on the bottom level at Malden center
 * One may be found in a dumpster behind the ice cream parlour, on the boardwalk, south of Revere Beach station.
 * One can be found behind a mag-locked door (aka unpickable; unlocked via terminal right above it) in the Mass Fusion containment shed.
 * One in the lower level of The Switchboard in the generator room.
 * One can be found in The Railroad's HQ escape tunnel near the exit behind a security gate.
 * Fusion cores are sold at various weapons and supplies vendors throughout the Commonwealth.
 * 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.