My battery just seems to be draining this past few day for no apparent reason. I've got the April OTA but can't install due to custom recovery, and I run with non-encrypted bootloader so waiting for Wugfresh to update - cant imagine that would drain the battery?
Edit - turns out it was the Outlook app, it must have had an update, was using 65% of battery since last charge, never even used the app or configured it lol - oh well