Diatium power cell/Legends

Diatium Power cells used in lightsabers contained extremely concentrated amounts of an unknown gas that would form a plasma beam when heated. The beam of plasma produced from a lightsaber was contained by a type of magnetic or energy field that recycled the energy back into the Diatium power cell when not in contact with other lightsabers or objects. This greatly conserved the energy of a Diatium power cell but now and then it still needed to be replaced.