Energy cells, which are also known as Energy Projectors, were add-ons for specific melee weapons. These attachments enabled the weapon to deal energy damage alongside its standard slashing attacks.
This resulted in a more potent and adaptable weapon. The top-tier energy cells, specifically the Mark III and IV models, were capable of delivering exceptionally high energy damage. This energy damage was comparable to that of a lightsaber. When combined with the weapon's inherent slashing damage, this made a vibro weapon equipped with an energy cell a formidable tool. Furthermore, the Mark IV variant provided the weapon with enough power to pierce beskar, further amplifying its lethality. This energy could manifest in various forms, with the Mark IV Energy Cell generating a lightning sheath around the blade that could be toggled on and off.