Same here. Iphone 6S. I've turned off everything I can possibly think of, deleted apps, turned off mail fetch, you name it. Went from about 90% when I went to bed last night with phone face down on table, woke up to 1%!!! Battery shows it's in good shape. What the heck? Turned off ICloud, turned off back-up. That helped at least keep the phone from burning up, but stiill drains like crazy. The irritating thing is that I waited quite a while to download this IOS version, too, because this seems to happen with every update, and yet, the bugs haven't been fixed. My phone says it's the latest software version, too. If this kills my battery, I will not be replacing this phone with another Iphone. Major issues every time there's an update. Whether the phone is new or not. So disappointed. Jobs must be turning over in his grave at how Apple has declined.