Plasma cartridge (Fallout 4)

The plasma cartridge is a type of ammunition $$

Gameplay
The plasma cartridge is a small, green container and is used by all varieties of plasma weapons.

Weapons using this ammunition

 * Plasma gun
 * Experiment 18-A
 * Sentinel's Plasmacaster

Locations

 * 100 can be found on dead General McGann, inside the Castle tunnels during the quest Old Guns.
 * Can be found on dead Gunners carrying plasma weapons
 * Sold by various merchants, such as Daisy, KL-E-0, Arturo Rodriguez, Percy, Myrna, the synth requisition officer, Eleanor, Proctor Teagan, Smiling Larry, and Deb.
 * Occasionally sold by Ronnie Shaw after completing Old Guns.
 * Found on Gunners at higher levels.
 * Two cartridges can be found on a counter in the armory of the Prydwen, sitting near a tray with other ammunition. These are the only placed instances of plasma cartridges in the game.