Battery drain even after battery replacement and factory reset

A month and a half ago I noticed huge battery drain after using Google Duo app, and even after replacing it with different video call app, the battery drain was still present. (The battery drain could’ve been present before but I just didn’t notice it.)

I checked usage data with Better Battery Stats and AccuBattery but with no avail, since they didn’t show anything unusual. Battery percentage drain was bigger than all of the added usage of different apps, and I had no suspicious wakelocks present. I also fiddled with the setting disabling background data usage, location services, etc… I also did wipe partition cache.

Last week I brought the phone to an official Samsung service center and they replaced my battery. Now, the battery does last longer but I am still losing cca 30% overnight without any visible cause.

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