u/Mysterious_Leg5765

If you're still skeptical of updating to 8.5, just do it, I used to only be able to reach 2 hours SOT, charging from 20 to 80, (on battery saving mode too) And had to charge at university just to make sure my phone lasts a whole day.

This is also with bluetooth running in the background because this week i have to monitor my heartbeat with a huawei smartwatch.