Since updating to iOS 9, Facebook has been chewing my battery like crazy (Down to 50% at a time during the day I'm normally at 90%). Looking at the battery history it shows Facebook using 40%, and having run 4.5 hours in the background. I have background app refresh turned off completely, and location services off for facebook, what else could be happening in the background?!? I have deleted and reinstalled facebook and no luck. ANYONE ELSE?!