O sabre de luz é alimentado por uma célula de energia Diatium :
The diatium power cell was the primary power source for a lightsaber and one of the critical components of a lightsaber hilt. Located directly below and wired into the primary crystal mount, to which was affixed the weapon's primary focusing crystal, these types of power cells were in turn wrapped within the power field conductor, power vortex ring and an inert power insulator. The lightsaber's pommel cap and its recharging port were attached directly to the diatum cell.
Os sabres de luz eram inicialmente (como protosabres) acionados por um conjunto de força montado na esteira conectado ao sabre por meio de um cabo de alimentação :
It seems the Dark Lords of the Sith Empire were ultimately responsible for the advancement of lightsabers, replacing the belt-mounted power pack with a power cell within the hilt. An internal superconductor was introduced, which transferred the returning looped energy from the negative-charged flux aperture back into an internal power cell. With this modification, the power cell would only expend power when the energy loop was broken, such as when the lightsaber cut something, solving the power supply problem.