I've never made a "bad battery post update" thread before in all my years of owning a smartphone. I see these threads frequently but have never really experienced it - until now. Since 8.4, my battery life has been noticeably worse. I noticed it immediately. There has been no change in my usage patterns, and Apple music is disabled, as is cellular data with iTunes. I'm sitting at a little over 5 hours of usage (about 10 hours standby), and my battery life just hit 30%. That's much worse than before. Eyeballing it, my battery life at this point in the day would have been 70% at worst before the update. Any suggestions? Location data is well controlled, cell reception is good, and background app refresh is off. Again, none of those things have changed, and my screen brightness is largely the same.