Interesting idea. Historical analysis is always vital to future progress. Liquid metal batteries would improve energy storage, if they did not have a net energy loss over time. The ancients may have had such batteries, a technology now lost to we moderns. A rare metal know as telonium was apparently used, but any known sources of such an electrical conductor now seem to be deeply underwater, so the batteries of the ancient grid probably existed well before the First Flood, the second flood being the one in Noah's time, as recorded in the biblical records - about 4000 to 3000 B.C.E.. THus any battery technology that existed before the Second Flood period in the historical record, was lost sometime from 12000 B.C.E. to 4000 B.C.E., with the time period of 9000 B.C.E. to 8000 B.C.E. being the most likely time slot - thus proving the existence and need for a human relationship with God as Creator when it comes to advancing science and technology in an environmentally responsible way. In other words, the ancients had the power tech, but not the spiritual smarts to keep from virtually destroying themselves. Will our era make the same mistakes?