I'm not sure if this is happening for everyone else but I filed a bug report on it. I had done a restore to put iOS 9 on and lost about 30% batter in standby. Home/Lock Screen took about 50% of the power, but Facebook was #2 for background activity even though I have backround app refresh disabled on Facebbook. This might be a possible case of the OS ignoring the BAR settings on some very hungry apps.
Topic:
App & System Services
SubTopic:
Core OS
Tags: