you can not find any energy cells in Fallout 3 after you find the ones with the alien blaster, you are limited to that number
it repairs your weapons
alien blaster but ammo is hard to find after you have it all and its at the alien crash site
In Fallout 3, alien crystals are a unique item obtained from defeating alien enemies, particularly in the "Mothership Zeta" DLC. They can be used as a crafting material to create various alien weapons and ammunition, enhancing the player's arsenal with advanced technology. Additionally, they serve as collectibles, contributing to the game's exploration and lore surrounding extraterrestrial life in the Fallout universe.
you go to the alien blaster location and jump on the alien space ship
north east of the map in an alien ship
exactly North of Mine field.
To trigger the alien ship special encounter in Fallout 3, you need to be exploring the Wasteland and have a high enough level. Look for a random encounter where a beam of light descends from the sky; this indicates the presence of the alien ship. Approach the beam, and you will be abducted by aliens. Once on the ship, you can engage in combat and potentially obtain unique alien weaponry.
The only ammo you get is where you get the Alien Blaster. But apparently there is more ammo near a truck where a Mr. Handy is. Hope that helps. :)
On the mother ship zeta expansion pack, if you don't have that you can't get them, besides one alien blaster with limited ammo at a UFO crash site
The alien crash site is under neither Vault 92 and Clifftop shacks. The distance on the radar is about the distance of Clifftop shacks and Vault 92 wide. Good luck.
from the crashed alien ship next to the dead alien