Fusion core (Fallout 4)

Fusion cores are an ammunition type in Fallout 4.

Characteristics
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: 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.
 * Running
 * Sprinting
 * Power Attacks
 * V.A.T.S.

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

Locations

 * Fusion cores can often be found in old generators throughout the Commonwealth or purchased from merchants.
 * Pre-War military checkpoints, scattered throughout the Commonwealth.
 * 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.
 * Far-Harbor
 * 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...