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The gears might be replaced with metal units after the originals wear or break. Since motor torque is based on current and the number of wire turns of the motor it may be to your advantage to install a switch to go between a series and parallel arrangement of the batteries. Higher voltages may allow for higher rpm and smaller diameter cables. A great deal depends on the capabilities of the controller. My guess is that 48v would be a good place to start. I have seen systems that range from 6v antique tractors to 72v motorcycles for DC motors.
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