Q: ios 8 battery drain issue and Bluetooth issues

I had the same issue with battery drain after updating to ios 8.  I've gotten used to working on my IPad Mini while it's plugged in, so when I went to start working, I was suprised that throughout the day my battery had drained down to 16% while it had been plugged in!  I turned off all recommended functions and nothing worked.  Looked up solutions and they said do a soft reset, did that twice and it only worked for a few hours.  Finaly I just turned it off and kept it off overnight and that seemed to do that trick, though it's been acting up again this morning.  Plugged it in last night, woke up this morning and right off the bat the battery was down to 79%.   Got it charged to 100% but now that I'm working again, the battery is down to 98% with it plugged in (I know 98% is not a bad number, but I'm not really trusting ios 8 at the moment).  All told, this is unacceptible.  There's no reason we should have to fiddle f art with our settings or jump through hoops in order to squeek out a battery life that would otherwise be laughable to other companies (i.e. Android).

I phone 5 .. my battery is draining super fast ever since the update. This morning at 8 AM 100% by 10 am it was down to 40% with minimal usage, ridiculous. Also having trouble with wifi and connection issues since the update. Get it together Apple.

I'm noticing in the last two days that my phone seems to be healing itself as far as battery drain goes. At first it was dropping 1% per minute (or more, it seemed). But now the drain has slowed to near iOS 7 levels. I have not changed any major settings (except turning WiFi Networking off....but I did that on day one with no effect) or disabled any major apps. Nor have I drained the phone to empty. Whatever it is, it seems almost like the OS is learning for itself how to manage power. It still ends the day with less than I had in the last version of iOS 7 which was ~ 70% remaining in 7 versus about 60% in iOS 8, but way better than the 21% I had when I first did the update. Fingers crossed this is a trend and my phone tapers out at similar levels to 7.

My biggest issue is on the ipad...real wifi response and loading issue and space is not an issue.  I did not know I could go back to ios 7 ...I am looking Now!!!  Helpful to see I am not alond

There's a large number of disparate problems on this thread. I'd advise you all try the usual apple sequence of resetting network settings, hard-reset the iphone / iPad by holding the home and power keys until the device reboots, then trying a complete restore of the device and restoring your backup using iTunes, then finally seeing if the problem occurs without restoring the iTunes backup.

If all this fails, the apple servers are apparently still allowing iDevices (not including iPhone 6, obviously!) to be DOWNgraded to iOS 7.1.2 -

Follow the instructions here:

http://www.tomsguide.com/us/apple-ios-8-7-downgrade,news-19613.html

You'll need to use iTunes for this.

OK...I don't know if this solved it..but I posted earlier after upgrading to iOS8.0 I could have a 100% battery charge and within an hour watch it drain to 10% while doing nothing.

Turned off ALL services as others have. Nothing seemed to do the trick.

Until that 8.0.1 update came out.

Now I have an iPhone5, and jumped on installing it. After the install and reboot now it's back to the usual lackluster battery life.

The only thing I have kept off is the iTunes & App Store Suggested Apps function as well as Location Services. But previously disabling those 2 features didn't solve my battery sieve issues.

cheers

S.

Mine is also overheating / always very warm to the touch since updating to IOS 8.

My iphone 5 lost 8% battery overnight from 8pm to 6am. However if I go to work it'll lose at least 60% in 5 hours with cellular data turned off. I think the issue with this is a weak signal cause at work I barely get service. However it was no draining my battery prior to ios 8.

I Found the problem in my case, maybe it will work with yours. In my cass it was the mail app which was causing the cpu to run at very high percentages when idle. I noticed that when I put the phone in airplane mode, the percentage usage of the cpu went back to normal. After further investigation ie deleting all my mail accounts, my phone went back to normal. Then started adding mail accounts one by one and noticed that my yahoo account was causing the problem. I would suggest that you download an app to monitor cpu usage. I use battery memory system status monitor, free from the app store. Then delete your mail accounts a asee what happens

Major battery drain issues on my end as well with my iPhone 5.

Prior to upgrading to iOS 8, I could easily have enough juice for 36h to 48h straight. Without changing any settings, right after upgrading now my battery is at 30% after 4h of use!!! and I didn't change my habits obviously, so something must be terribly wrong. So I started disabling stuff per recommendations over the net (less location services, dim the light, etc, etc.) it must have helped a little I guess but so far I can't finish a day on a single charge. Very frustrating, something low-level in the OS is eating up a lot of energy and Apple didn't profile their stuff properly (I'm a software engineer so I know how that stuff goes).

i have installed iOS 8 my battery discharge very fast

today i instal the iOS 8.0.2 but the battery discharge too fast.

when it comes to 40% ,in 3 hour with minimum usage,go off, and if I connect it to the charger and how it was completely discharge

please resolve the problem

I have a iPhone 5

Battery drain in 3 hours after installing ios 8.0.2, and AAPL will drain to if they dont fix it.

I also have this problem , right after updating my iPhne 5s to iOS8 my battery life is much shorter , I used to go comfortably through a day , now my battery life barely lasting me till I get  home , it got reduced by approximately 25% to 30% , granted it's not as bad as other people but still a big issue for me and it's unacceptable.

Apple should give us an option to downgrade to iOS 7  , i don't want to be forced to jailbreak my phone to bring the functionality back , i would expect way better that that from a company like Apple , do you actually beta test your software ?

My iPhone 5 appears to be functioning normally after a hard reset/ restore & then updating to iOS 8.02.  Also note that according to the bartery usage it was draining on my calendar & contacts/low signal.  i changed some setting related to that & also set my email to manual. I do still notice some overheating as someone else mentioned

iOS 8.0.2 solved nothing me in term of battery drainage and overheating.

I still have to have Mail on Manual, kill all my processes, and reset multiple times a day.

They solved some other unrelated problem that they care more about than users do...