1, directly buy a car charger, the kind with USB jack (if the phone does not have a USB cable, and the mobile phone jack is alternative, there are five common kinds, you can directly buy five linear car charger. But most mobile phones support USB cable charging, do not support their own change, it is easy to positive and negative two wires), and then the charger power to make two leads, the middle is positive, both sides of the shrapnel is negative, many can not be reversed, otherwise it is easy to burn.
2, choose a waterproof position, it is recommended that the inside of the guide cover, fixed, and then connect the positive pole to the positive pole of the front brake switch line, and the negative pole is connected 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 handlebars, and the mobile phone can be charged during driving.