Buy a car charger directly, with a USB jack (if your phone does not have a USB cable, and the mobile phone jack is alternative, there are five common kinds, you can buy five linear car charger directly, but most mobile phones support the USB cable charge, do not support yourself to change one, it is easy to make two wires), and then the charger power supply to make two leads, The middle is positive, both sides of the shrapnel is negative, many can not be reversed, otherwise easy to burn! Choose a waterproof position, recommend the inside of the guide cover, fix it, and then connect the positive pole to the positive pole of the front brake switch line, and connect the negative pole to any position that can take the iron! In this way, it is waterproof, and can ensure that only unscrew the electric lock to work, prevent leakage, and buy a mobile phone bracket fixed on the handlebar, the mobile phone can be charged during driving! That's detailed enough