Energy cell pack

An energy cell pack is a "" of plasma cells that serves as the larger ammo used to power the plasma gun and the BFG9000 in Doom and Doom II, and additionally also the Unmaker in Doom 64. In the original games it is somewhat shaped like a large black and gray car battery with three yellow lights, whereas in Doom 64 it is green-brown in color and has a similar pattern of three green lights as the standard cell. It contains 5 energy cells (which have twice the usual amount of energy on the I'm Too Young To Die and Nightmare! skill levels). The plasma gun empties one cell with 20 shots (1 whole cell and 40 shots in NM and ITYTD), while each BFG shot consumes 2 whole cells. Thus, one pack can provide 100 plasma rifle shots, or two BFG shots with 20 ammo left over. The Unmaker on the other hand has a different ammo consumption depending on how many Demon Keys the player has collected, ranging from one at zero keys to three at full keys.

Each shot from the plasma gun does 5-40 hit points of damage, determined using Doom's pseudorandom number generator. BFG damage calculations are more complex; a direct hit inflicts 100-800 points, after which additional energy damage is discharged, that can take the total damage into the thousands of hit points. Each attack from the Unmaker (visually a laser but in practice a hitscan attack) deals between 10 and 80 points of damage.

Appearance statistics
In the IWADs the energy cell pack is first encountered on these maps per skill level:

The IWADs contain the following numbers of energy cell packs per skill level: