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Holy crap... worse than the last build on my battery... L1520... I updated from 8.1 (because last build drained my battery in about 8 hours no matter what I tried to do) last night... after the update I had about 50% battery... So I put it on the charger.... when I went to bed it was still at 50%.. Get up this morning after letting it charge all night... 20%! WTF.. I check the charger.. it's good... cable is good... Bye Bye build 10581 this is bad.
Did you have a look into battery sense? E.g. on the 820 with build 10549 I had the process "Start" with 99.6% total background activity in 24h.