What is the reason why the USB in Nezha V cannot charge?

[SanValentina]

Nezha V's USB cannot charge because the current power of the USB car charger does not match the current power required by the device. The relevant introduction of the USB interface is as follows: USB interface current: Many car USB interfaces are designed for transmitting audio data. The current of the car's USB interface can be either 5v/2.1A or 5V/0.5A. However, many mobile phones require an input current of 5V/1A or 5v/2.1A from the car's USB. If a 5V/0.5A interface is used, it is obvious that the current does not meet the standard. In this case, charging the phone not only takes a long time but also causes the phone to overheat. Abnormal USB charging power: Many people may encounter a situation where they use the USB to charge while driving, but the battery level does not increase and instead decreases. This is because some car owners are still using navigation while charging, and the current is relatively small, so the power consumed is more than the power charged.