something tells me super-cap capacitor banks will supplant the conventional battery.
they can be charged immediately as they're in banks that are in parallel and they hold their charge for a very long time compared to normal capacitors.
it's one of those technologies slightly out of the public eye but when it comes to energy density and ease of re-use i cannot think of any other electric charge storage medium that is even in the same league.
obviously not fully developed yet, but i tend to think things like electric cars will be far more feasible with them.
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