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Range is all about how much 'power' your battery can carry, like a cars gas tank. The higher the voltage, the more cells the pack has, hence it's size. The Amps depends on how much each cell can put out. 48V 1KW 25-30AH LI is a manageable size to give you some real power. ~$1200. I build...

There is if you know how to use it. Use a generator as a brake. Turn than momentum energy back into electricity to recharge the batteries that provided it. Sure there are big losses but provided you draw as much as you can to slow down you may not have to worry about brake very often as all...