This .....if it comes to light will be the game changer. Go IBM
Sorry if it is a repost
I tried the search first but could not find anything.
Technology Review: Waterproof Lithium-Air Batteries
Lithium-metal batteries approach the energy density of fuel cells without the plumbing needed for these devices; in theory, the maximum energy density is more than 5,000 watt-hours per kilogram, or more than 10 times that of today's lithium-ion batteries. Lithium metal-air batteries are also very lightweight because it's not necessary to carry a second reactant. Lithium metal is "the holy-grail battery material," says Steven Visco, chief technical officer and founder of PolyPlus.