Makezine_COTM_Batteries-BadgeWhile not terribly practical for outputting large amounts of electricity, this “gravity battery” demonstrated by YouTube guru MrTeslonian shows a fun way of generating electricity.

In his video he mentions a 25′ version with a pair of water-filled jugs, and when one jug hits the bottom, a pump is triggered that refills the empty jig at the top of the rig, and the process continues. Way cool!