Electron Charge Pack (Fallout 3)

The Electron Charge Pack is a type of ammunition $$

Gameplay
This type of ammunition is considered one of the rarest ammunitions in the game and is used by big guns and one energy weapon.

Weapons using this ammunition

 * Gatling Laser
 * Vengeance
 * Tesla Cannon
 * Precision Gatling Laser

Locations
The Electron Charge Pack is very rare at lower levels, but it can be found in a few places. Acquiring the Scrounger perk makes this ammunition much more plentiful. The amount of Electron Charge Pack ammunition found will most likely depend on the type of character encountered:
 * Sentry Bots that have a Gatling Laser weapon often carry a few rounds.
 * Merchants occasionally stock up on the ammunition type. Like 5mm Rounds, they normally have many in their inventory at one time.
 * Enclave, Brotherhood of Steel, and Outcasts occasionally carry a Gatling Laser, as well as the ammunition for it.

There are several locations that will always hold an Electron Charge Pack:
 * One in Evergreen Mills Foundry, on a table with a radio.
 * One in the Mechanist's Forge, in the room with the dead Protectrons ('Sector A' as noted on the computer terminals).
 * Four in SatCom Array NN-03d-B; the "knights" on the completed Chessboard.
 * Flak 'N Shrapnel's in Rivet City.
 * Lucky Harith, after second investment.
 * Chief Gustavo in Tenpenny Tower seems to hold a lot of this type of ammunition.
 * Karl under Meresti trainyard.
 * Even without the Scrounger perk, many of these can be acquired during the Following in His Footsteps and Galaxy News Radio quests in the ammunition boxes scattered in the Metros and around the quest areas.
 * Sydney after she becomes an ammunition dealer in Underworld.
 * seven are available after completing Operation: Anchorage in the Outcast outpost.
 * Around 32 can be found inside Old Olney underground when going up the ramp into the hospital. At the top turn around, they will be there along with a Frag Grenade.
 * The basement of the Point Lookout Lighthouse in Point Lookout has plenty of this type of ammunition, two Gatling Lasers and several other energy weapons with matching ammunition.
 * Five packages of 20 charges each can be found inside St. Aubin medical facility during A Meeting of the Minds. They are in the first room on the left after fighting the two turrets, together with lots of other ammo.
 * Super Mutant Overlords also carry the Gatling Laser and ammunition for it.