AJLond1
Lv. 100 Napper
but I'm still waiting for those to come to market
Oxis (a company who helped to engineer the tech) plans to release these to the market by this year: http://www.oxisenergy.com/blog/anesco-and-oxis-to-release-lithium-sulfur-battery-storage-by-2016
And Sony plans to release the version by 2020: http://asia.nikkei.com/Tech-Science/Tech/Sony-battery-to-offer-40-longer-phone-life