Both my wife and I experienced terrible battery drain today on our nexus fives and the culprit for both was the Facebook messenger app! I uninstaller the app and while it was gone the battery was fine but reinstalling caused the drain again.
I'll uninstall it again, obviously but I'm curious if anyone else has encountered this issue? I see the app was updated on the 4th of Feb but I always update my apps as soon as I get the notification and the drain only happened today so not sure if maybe it took a while to push the update or something?