I think I found the problem.
When I leave my phone on during the night, I turn mobile data and wifi off, but my connection is still LTE. I was noticing about 10-15% drain as soon as I wake up. What I tried was to set the phone to just use 2G (GSM), still leaving mobile data and wifi off. I woke up this morning with just 3% battery drain.
It's weird though because I get very good LTE reception so I don't think that a poor LTE connection was causing the problem.
Does this mean that LTE really consumes that much battery?
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