By now, at least two or three electric vehicles have resurrected the electric vehicle dream, thanks largely to a couple of advancements in rechargeable battery technology. Lithium-ion battery technology is still nowhere close to fossil fuels in power-to-weight ratio. The lithium-ion battery found in the Tesla Motors, for example, uses the Panasonic 18650 lithium-ion cell, about 260 Wh/kg. About 7,000 of these give the Tesla Model S a range of up to 300 miles.