We need more energy: Envia Systems' 400 Wh/kg Li-ion cells

This technology promises to halve the cost of an EV battery with a 300 mile range.

http://www.chargedevs.com/content/features-inside/we-need-more-energy-envia-systems-400-whkg-li-ion-cells

/ Watt per kilogram kilogramme battery technology /