|The following is based on Van Buren and has not been confirmed by canon sources.|
Small energy cell is a type of ammunition that was to appear in Van Buren, the canceled Fallout 3 by Black Isle Studios. It is also featured in the Van Buren tech demo game files.
This section is needed but has not been written yet. You can help Nukapedia by writing it
While it doesn't appear in the Van Buren tech demo, it is still present in the game files and can be spawned with the console command CreateEntity AmmoSmall_Energy_Cell.amo.