Hi mikekklau,
Does the battery drain in sleep mode or in use?
If you feel like the battery drains during using specific apps, we would suggest you test how much the app drains after using it for a certain time.
We would suggest you clear the background apps, and check how much battery is consumed from 100% after using the app for a certain time (e.g. 30 mins or 1 hour.)
Please show me a screenshot of the battery usage after testing.
Settings > Battery > Tap Battery icon to access Battery usage.
If there are battery drain issues in sleep mode,
in order for us to verify, please kindly follow the steps below and show us the screenshots.
1) Charge the phone to 100% before going to bed > remove the charger > Clear all apps in recent app list > turn off screen > the next morning before using the phone, please screenshot the two pages:
a) Settings > Battery
b) Settings > Battery > ""Advanced battery usage"" (tap the battery icon to access)
2) Tell me the battery variation: for example 23:00 (100%) > 08:00 (90%)
Thank you 🙂