I have a GN and purchased an extended battery. It worked fine until this weekend. Then it started to drain at an excessive rate.....lost 40% in less than 2 hours. I checked battery use and found the calendar app was using 45% (the screen was only using 25%). I found the calendar was using most of my data usage (224 MB out of 366MB used) too. I have tried to turn the app; couldn't find a place to do that. I tried to force stop it but like a zombie it kept going. Any suggestions on how to reduce battery drain especially from calendar (by the way I don't even use the stock calendar......I use aCalendar which uses 2% of my battery use) PS The phone used 4% in the time it took to type this post!