The Power Battery is the source of energy for a Sinestro Corpsman's ring, and as such is a vital possession for a Corpsman. Each Sinestro Corpsman has a Power Battery shaped like an old fashioned lantern, which they can use to recharge their ring. These smaller Power Batteries are linked to the Yellow Lantern Central Power Battery on Qward, the source of their power. Unlike the ring, Power Batteries do not need to be recharged. The power batteries of the individual Sinestro Corps are carried in the Manhunters.