Cells
From QWiki
Cells are a type of ammunition used to power the Lightning Gun, also called Thunderbolt. Cells come in two types of boxes: small and large. Small boxes contain 6 rounds while large ones contain 12 rounds.
For Mr. Thunderbolt. A small battery has 6 charges, lasting a little over a second.— Quake 1 Manual
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Trivia
Enforcers drop 5 cells when killed.