Energy cartridge

An energy cartridge is a junk item in Fallout 76.

Gameplay
A black metal cartridge casing with some markings and an attach point on its underside.

Crafting
The energy cartridge can be broken down into its individual components for use in crafting:

Locations
Being the only fixed location, one can be found on a metal shelf next to the tinker's workbench in the basement of the Overseer's childhood home in Sutton.