Reasons and Solutions:
1. The battery is damaged
With the use of mobile phones, the capacity of mobile phone batteries will slowly decrease. Until it feels like the battery's gone. The best thing to do at this time is to replace the phone battery.
2. There are too many background programs
Each program opened will consume the phone's power, and too many background programs will cause the phone to consume a lot of power. Closing unnecessary background programs can effectively reduce power consumption.
3. The screen brightness is too high
Generally, the higher the brightness setting of the mobile phone, the more power consumption.
4. Enabled Bluetooth, GPS, WiFi and data connection.
5. You use your phone too much