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sounds good but ultra-capacitors are irrelevant at this point in technology. People go gaga over them but honestly this technology is probably a long ways off. The companies that are researching them are only touting the fact that they have promising leads for results. not promising results.
A capacitor the size of a old roll top desk provides enough power to move your car slowly one city block. chemical reactions are far more compact. The ultimate logical next step is a nuclear isotope battery(satelites). But they are kind of dangerous so its only safe to put them thousands of miles away from people and where if something goes wrong it gets disintegrated into powder so fine SELs are needed to observe them.
Go with the batteries. Golf cart used batteries are the best cheap place to start( I got a couple off of a summer camp I used to work for(the one with the electric tram and a substantial supply of golf carts)
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