So i am not sure if anyone but me ever noticed this from FO3 and NV but i will explain just to cover that basis:
A conventional firearm in Fallout (Guns) uses bullets obviously, when you reload you remove a magazine filled with said bullets and replace it with a new one. The ammo counter on your HUD shows exactly how many bullets you have in your magazine as well as in your inventory/reserve
Energy Weapons display the same way except that it doesnt make sense in how they "consume ammo". An Energy Cell is like a battery, a laser pistol uses the power from the Cell to fire it's shots. However you put 1 Cell into the Pistol but your "magazine" contains more than 1 shot, also when you fire you "use up" more than 1 Cell every shot. If you were to have 10 Cells and you dropped each one on the ground you would have 10 separate Cells but if you use them in your laser pistol it would say you have 10 "shots" in a magazine without reloading.
So the point is: Will FO4 finally fix this and make it where 1 Cell has it's own "charge" all contained within that 1 Cell? Seriously this bugs me, i can see how many may have just never noticed it and ignorance is bliss but i think this would be an excellent mechanic to make Energy Weapons further differentiate from their Conventional Firearm counterparts