@markus66 I am running on a Poco F1, with OTA-20. Eight hours of very light use (no Bluetooth) reduces battery by 23 %, from 58 % to 35 %. Of course, such values differ due to different battery ages and different usage patterns.

If you gave up, you might try again because the Poco F1 is a very well supported device. BTW: Can we please have a device subcategory? 🙂