I caught my Wifi being sneaky the other night.. After unplugging at 10 p.m. fully charged, I woke up at 7 a.m. and was down to 70%.. Checking my battery stats, I seen that the Wifi had been running since I had unplugged, even though I was on mobile data only.. Clicking into my Wifi settings, I noticed that network notification and always allow scanning were ticked, and I unticked them right away, and noticed a big turnaround in overnight discharge.. Just a heads up! 
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