So here's a strange thing. I've had two weeks of crazy battery life. Always lasting well more than 24 hours, including up through last night when I put it back on charger after 48 hours and 15% battery life still left (this was after an admittedly very light weekend of usage, but still very impressive). This morning. I took it off charge and noticed early on that the battery was draining very quickly, even with little use. I'm now at 14 hours with 30% battery left with only 57 minutes of screen time and 20 minutes phone time. The highest usage indicated is for email which has taken 30% of battery life. Email has never shown up as a large user before.
The only change I have made is turning on face unlock last night, but I don't think that should be impacting too much. I did find that all update choices on my gmail account were active, although I don't use gmail much, mostly exchange server. So I turned those all off. Map locator is off, as is GPS.
Another strange thing I noticed this morning is that the battery widget was showing a different % usage than the battery settings screen, and the weather widget wasn't working, (wouldn't flip). Rebooted and they both seemed to work fine.
I'm going to recharge tonight and try with facee unlock off and gmail updates disabled. Anyone have any other ideas?