Fusion core (Fallout 4)

The fusion core is a type of ammunition in Fallout 4.

Characteristics
Fusion cores are used to power and activate 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 magazine capacity will remain at 500. Also combining with Repair bobblehead, the total amount of shots can be raised to 1100.

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.

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. Solution: Unequip and re-equip the weapon.
 * 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.

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