Lithium-ion batteries can easily achieve 150-200Wh/kg Li-Ion in vehicles usually involves redundancy so as to minimize the discharge-damage to the cells. The T

Lithium-ion batteries can easily achieve 150-200Wh/kg Li-Ion in vehicles usually involves redundancy so as to minimize the discharge-damage to the cells. The Tesla Roadster batteries weigh about 400 kg and are rated to hold about 50kWh = 125 Wh/kg. http://www.teslamotorsclub.com/technical-discussion/354-tesla-roadster-batteries.html http://www.teslamotorsclub.com/technical-discussion/354-tesl...