I've looked around and it seems there are lithium-sulfur based batteries with 10x capacity and all in all lasting 4x Source: http://www.extremetech.com/extrem

I've looked around and it seems there are lithium-sulfur based batteries with 10x capacity and all in all lasting 4x Source: http://www.extremetech.com/extreme/157525-new-sulfur-based-battery-is-safer-cheaper-more-powerful-than-lithium-ion http://www.extremetech.com/extreme/157525-new-sulfur-based-b...