Hi, I am new here. Have decided to make an electric bike with a cyclone chain drive 500W 24V. I was just wondering why I can't use large motorcycle Gel batteries or even two car batteries mounted in a trailer, I realise they will not be as efficient but I only have to go 5 miles to work and they can charge all day there? This seems a sensible alternative as the price of batteries is shocking (more than the motor kit cost me). Thanks in advance Clive.