You keep posting this in battery threads, but there is absolutely no proof that that is the issue. I have had this turned on for years now and have seen no negative impact on battery life. Also, if you turn this off, you lose a lot of functionality. iCloud tabs and bookmark syncing to name some.Try disabling Safari syncing under iCloud settings.
I wish it were that simple. Ive been using the Facebook app for years. This happened the day I updated to 9.3.2. I tried removing the Facebook app and using safari, same thing. I tried disabling LTE and only using 3G, same. If I open the camera to take a picture it costs me about 4-5% by the time I've taken the photo. Theres an iOS issue going on but I don't know how to track it down. Anyone proficient in Xcode that can talk me through figuring out whats going on. I really don't want to go all the way to the closest Apple Store for them just to tell me to turn off all the things the phone is supposed to do.Bingo!
I'm on an iPhone 6 as well and have faced the same issue but I've managed to sort it out by doing a battery power cycle and then restoring the device and setting it up as new.My battery is flakey recently. It may have been longer, and I just didn't notice, since I keep it in a battery case. But one day I forgot to charge it, and was running off of just the internal battery. Made quick drops from 30-17-2, and shut down doing an app upgrade. Plug it in, immediately up to about 15%. So I think there is an issue with the battery. I'm taking it into an Apple store Saturday. (This is an iPhone 6).