Does the battery drain more when using any specific app?
If there are battery drain issues in sleep mode,
in order for us to verify, please kindly follow the methods as below:
(1.) Charge the phone to 100% before going to bed > remove the charger and turn off screen> the next morning before using the phone, please provide me two screenshots:
(a.) Settings > Battery
(b.) Settings > Battery > ""Advanced battery usage"" (click on the battery icon to access)
(2.) Provide me the time interval and the battery level: for example 23:00 (100%) > 08:00 (95%)
(3.) In the meantime, were mobile network, WiFi, and Bluetooth turned on or off?