Thank you for your inquiry. In order for us to help you with your situation, please kindly provide your information in English if possible.
Are you talking about battery drains in standby mode or in use?
If you think that there’s battery draining in standby mode, please charge your phone to full before going to sleep, and leave it unused and unplugged overnight. Please capture 2 screenshots as below on the next morning before you use your phone and tell me how many percentage of power the phone has consumed overnight:
1. Battery : settings> Battery
2. History details: settings> Battery> please click the sheet