Batteries

Two factors influence the feasibility of a battery type:

• How many Wh / kg can the battery store?
• What is the Price per kWH

see the calculation at http://www.withouthotair.com/cA/page_261.shtml how the first factor influences the achievable range of an elecrical vehicle powered by a battery.

$240-$280 per kWH for a Tesla according to http://www.torquenews.com/2250/what-makes-tesla-s-batteries-so-great

400 Wh / kg

There have been several companies claiming that they are close to the 400 Wh / kg target

Envia

Envias 400 Wh / kg claim was used to convince automotive companies like GM but the claim was exaggerated

• https://chargedevs.com/features/we-need-more-energy-envia-systems-400-whkg-li-ion-cells/
• http://qz.com/158373/envia-the-mysterious-story-of-the-battery-startup-that-promised-gm-a-200-mile-electric-car/