Just did a factory refresh last night, did not download any apps, no facebook, no flickr login, no outbound text messages sent, gmail set to auto sync. The battery was about 80% before going to bed and 8 hours later when I woke up it asked me to plug the charger in. Is this normal? Is it really just the gmail auto sync/weather app that killed the battery overnight or are there other factors? There were no missed calls, only an alert about new gmail.