1. The interface is faulty. Because the mobile power supply in order to adapt to a variety of mobile phone applications, the mobile power supply is configured with a common mobile phone interface. If the phone interface and the charging bank interface do not apply, you should find a wiring. If the interface is consistent, or can not be charged, it is necessary to check whether there is poor contact between the two interfaces of the data cable, it is recommended to change a data cable test.
2. Voltage or current problem. Because some mobile phones are more special, the voltage is different, so it can not be charged, the normal lithium battery is 3.7V voltage, like the normal mobile phone is used 5V voltage, if you do not do the boost case, the general lithium battery is unable to charge the Apple phone.
(1) Some devices are different from Apple mode in id voltage design, so they cannot be directly adapted (equipped with a adapter, that is, a transformer to achieve charging purposes);
(2) Some of the device's own data cable has line protection, so it cannot be directly adapted (the original data cable can be replaced for charging purposes)
(3) Some of the device's own current input is 0.5A, its battery is equipped with excessive current protection, with the output of ≥1A mobile power to charge it, the battery automatically turns off the input, so it can not be adapted.