Sadly we'll never see new battery tech that lasts this long because every time someone invents something new an oil company comes along and buys up all the patents. Kind of like how American motor companies bought up all the public transport systems in the U.S, made the services awful so people would be more inclined to buy their cars.<br>For an intelligent species, we're pretty greedy and stupid.,(reply>), You can invent without patents you know.