It should go into sleep. If it loses so much power over 12 hours of no active use, it must be either some app running, some network misbehaving or battery dying.Yes, it is a lot, but I had players and phones with similar drain and I can live with it. Unfortunately at the moment after 12 hours M3x loosing 50-60% battery live. It looks like M3x don't go into deep sleep for some reason, any idea why?
I would recommend to make sure you are running the latest firmware, do factory reset and keep it sitting with wi-fi/bluetooth disabled. If you still see big battery drain, contact your seller for warranty.
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