12V Charge Controller
Protect your batteries from being over charged with this charge controller. Without it you could dramatically shorten the life of your battery / powerpack.
Your battery / power pack has a limit on how high of a voltage it can see while charging. One term to describe this voltage is called the "Peak Charge Voltage". If you pedal too fast and generate too high of a voltage, then you could exceed the peak charge voltage and supply your battery with too much current. This would damage the cells i