I am a fan of Lyten new battery now sampling. It uses Li Sulfur and carbon (a unique graphene structure). It has 2X the power density. So 600 miles instead of 300. Or cut it in half for 300 miles at 1/2 price. Of course it is TBD what the real yield is, but material cost is low. Why am I a fan. The company is a Si valley start up and, as I understand it, discovered the carbon structure, in part, buy luck.