The upcoming Tesla Model S has a big 'ol slab of batteries that make up the floor of the thing, shown above, but Tesla CEO Elon Musk says that sort of technology just won't do in the long run. He thinks that the days of the battery are numbered, and that it's the humble capacitor that will "supercede" traditional cells and let our future selves roam wild in our Teslas, largely free of range anxiety. Ultracapacitors are basically big, powerful versions
