The fast charge fails because the USB port of the phone is broken, or there is a problem with the battery of the phone.
Reasons for slow cell phone battery:
First, the mobile phone system is faulty, which leads to problems with the battery level display. This problem is the easiest to solve, you can directly shut down and restart, which is equivalent to data refresh, and the general power display will return to normal.
Two, the charger is faulty. This failure is the main reason why mobile phones cannot be charged. So how to judge the charger is good or bad. It's actually very simple, try another charger. If it can be charged, it can be concluded that the charger is faulty.
Three, the charger and mobile phone contact is poor. It is also very common that the charger is not plugged in properly due to careless phone users. The solution is simple: change the jack back and forth.
Four, mobile phone battery problems. In general, it's rare to have a problem with your phone's battery. But once there is a problem, it is a big problem and must be paid attention to. Therefore, when it is found that the charger and the mobile phone system are not faulty, the battery should be checked. If the battery is found to be swollen, then it means that there is a problem with the battery, and it must be stopped immediately.