Today I went from 100% to 5% in 4 hours normally I finish work and go home with 40% left. Changed nothing in my habits no new apps just a recent security update and general app auto updates Thouhht my phone was broke so I did a companion xperia restore on the pc when I got in. Phone is still the same, bad drain issues. I'm using a song Xperia XZ android 7.0 with a few security updates that have come through December - January. I can physically watch the battery % tick down - 1% per minute as I'm looking at my phone. It wasn't anywhere near this bad until this morning.
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