We've been working on this, actually, as an alternative energy source, starting way back with Johnson amp Johnson, to run an iBOT, because the best batteries you could get 10 watt hours per kilogram in lead, 20 watt hours per kilogram nickel cadmium, 40 watt hours per kilogram in nickel metal hydride, 60 watt hours per kilogram in lithium, 8,750 watt hours of energy in every kilogram of propane or gasoline which is why nobody drives electric cars.