Hello. I have big time problems with my desire 820 battery. I did some battery tests by putting max brightness level on phone and kept the screen awake like that for 2 hours. The battery got from 100% to 97% and that's okay for a 2600 mAh battery I guess. But when the OS runs and I use my phone for messaging, apps etc then the battery drains down like crazy. Assuming to that I think the problem may be the OS itself. Currently running android marshmallow but had the same battery problem with lollipop. Also did battery calibration and tried wiping cash but the problem persists. Anyone know how to fix this ?
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