The Energy Cell is an Epic Magazine Attachment in Unturned 3. It holds 40 discharges, and is used by the Focus Weapons. It takes up 1 (1x1) slot in the Inventory. They will dissapear from the player's inventory if it has no discharges remaining.
They do not have a box to be refilled with, unlike most other magazines.
France: It can be found pre-attached to any Focus Weapon, and is only found in RULA Facility.
The Energy Cell has the third highest ammo capacity to magazine size ratio in the game, behind the Nykorev Box and Hell's Fury Drum.