This tech looks promising:
https://www.youtube.com/watch?v=Go2g_BNpG_Y
I'm waiting on Graphene Lithium Sulphur batteries. If they can make them work they should have all the advantages of Graphene Lithium Ion with 5x the capacity.
Problem with high energy capacity batteries like Lithium-types. They make good hand grenades ;-(
Tim the Toolman ... "More Power"!