Called general market, there is a power switch contacts, battery bike brakes usually have, as long as a brake on the power, in fact, it can in turn use the power you can use normal batteries, then you have to change as a electric vehicles like the brake lever, repair to the place to buy, the main power switch is very cheap it is difficult to buy, a few dollars, the basic needs of the electric car or motorcycle parts market, supermarkets have, then that is light The problem, I guess you should have like light, right? Now you need to end a long line switch, the switch will cut the original segment, receiving the power switch, you can first try to avoid reversed! General Electric Bikes are like this! If you are interested in by hand, you can try, but it is recommended to buy ready-made, are not generally made of waterproof, as long as the rain you have to buy power from the switch.