The possible reasons are as follows: Check the programs running on the phone.
Many people are not used to clear the background program of the mobile phone, a day to use, the mobile phone has opened the program is very much. However, many programs do not exit the running memory of the phone, but have been running in the background of the phone, so the loss of the phone's power is very large.
So get rid of the software you don't use much, and try to get into the habit of cleaning up the phone's background (memory) resident programs will be a good solution.
Problems with the cell phone system.
In fact, this situation is also a lot of see, many friends like to brush the phone into a variety of systems, some systems may have some bugs, the battery optimization of the phone is not very good, will also cause such a situation.
The solution is to try to find a more perfect mobile phone system brush into, trying fresh is also risky.
The phone charger or USB cable is faulty.
The general check method is to borrow a friend's charger to test it, if others have no problem, it is recommended to replace a charger and USB cable.
The interface (charging part) of the phone is faulty. After one test using the above method, the problem still exists.
It is recommended to take the mobile phone to the maintenance point to find a professional maintenance personnel to check, usually may be the fault of the mobile phone charging interface, of course, may also be the fault of the mobile phone battery.
But the latter case is relatively rare.
This is because of the output problem of the mobile power supply.
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1, when the mobile power supply is charging the mobile phone, the mobile phone shows that it is charging, and the power of the mobile phone has not risen, but it is lower, this is because the output of the mobile power supply is too low, the output current is not as fast as the power consumption of the mobile phone background, so this situation will occur.
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2, under normal circumstances, mobile power is not such a situation, this situation may be because the mobile power motherboard booster board failure, it is recommended to find the manufacturer directly repair or replace.