The current mobile phone charger is composed of a charging head and a data line, the data line can be universal as long as the interface is the same, and the charging head output voltage and current are different, most of the mobile phone charging voltage and current are 5V, 1A, and some mobile phones support the fast charging function, the output current can reach 2A, the voltage is also increased appropriately. Using such a charging head, the charging speed will be accelerated, but for mobile phones that do not support fast charging, it will have a certain impact on battery life.