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SEVERE battery drain on P20 Pro

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Senior Member
Mar 13, 2017
Hey guys. Massive problem here. I have stock EMUI 9 installed and I seem to lose 15 to 20% battery overnight when left idle. Gsam and BBS show nothing major or out of place so not sure what is keeping my device awake. Also I have only my main apps set to be managed automatically by EMUI and 90% of all my other apps are manually managed to not auto run/secondary launch/background etc.

Anyone got any idea as to why this is happening? I have factory reset several times and a few days ago my mother used this phone with only WhatsApp and Pinterest installed and she still experienced the same as me.