Most Unmanned Systems are powered by batteries. The most commonly-used battery technologies in ACTIVEROBOTICX Unmanned Systems are Lithium-based, as they have a higher energy density and so provide excellent power to unit weight ratio. The prevalent lithium battery chemistries are Lithium Polymer(LiPo) and Lithium Ion. Lithium Sulpur technologies are also being developed which can provide greater efficiencies in battery performace.