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Alright so...the battery was fine been using it for months on M now im worried the android system has 75% usage with keep awak 20h 28min, phone idle 20h 29min and screen just 1h 32min...i don't remember android system being 75% usage Oo i think it was less...
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I also have battery drain problem. It went bad after upgrading to 6.0.0 now is even worse with 6.0.1. My battery lasts just one day and a half. I easily used my phone for 4-5-6 days with Stamina before so now is disaster. I did factory reset just to make sure something didn't upgraded wrong but same s**t... Solutions in the pointed thread didn't help.