My Nexus 7 battery was draining at an alarming rate all of a sudden. It would drain 50% overnight even when I wasn’t using it. I’ve still not ascertained the culprit but I guess an app that forcefully stopped background-apps when the monitor switched-off was the reason behind the anomaly. I’ve uninstalled many applications just to be on the safer. Apps have the bad habit of running as background services in Android (not specific to Android though; is by design).
I’m happy that the alarming running-out-of-juice has been finally fixed.