The Supervolt corporation had a reputation for manufacturing power sources for lightsabers. It is documented that at least one Sith, specifically Darth Vader, utilized Supervolt batteries to power his lightsaber.
Nevertheless, these power cells had a reputation for being prone to malfunctions, an issue that Vader experienced during his duel with the Energizer Bunny. This malfunction was a contributing factor to the Energizer Bunny's triumph over Vader, who expressed his defeat with a pained cry.
The appearance of the Energizer Bunny occurred within a Star-Wars-themed advertisement. The commercial depicted Darth Vader's lightsaber as being powered by Supervolt.