Battery life for iPhone4 after ios5 update

sorry to hear about your problem. just as an fyi my battery is fine on iPhone 4 with iOS 5. rignt now i'm sitting at Usage 1 hour 7 minutes, Standby 1 day 11 hours, and my battery percentage is 87.

I encounter the exact same problem with my battery since I upgraded yesterday to iOS 5. Already 2 full charges in 36 hours!!

I do keep bluetooth live all the time (a necessity) and have a link into my exchange account. Apple better not come back with the fix being a recommendation to turn off location services, blue tooth, exchange, ..... that does not meet the need for me. If you have all of those features turned off your battery life might be much better, but then again you only have 1/2 a smartphone.

I am in the same boat. If we were talking about the 3GS it would be a different story but the iPhone 4 is still a capable device.

I'll suggest what I've done (and what Apple geniuses have recommended in th same situations after a significant change to the OS) and that's to do a full restore and to not restore from a backup. This is a lot easier now with iCloud, since it will automatically back up your settings and installed apps and restore them after a clean wipe. All you will need to do is sync with iTunes to restore your music. After wiping/restoring I recommend giving the phone a new name to differentiate it from your previous backups in case anything goes wrong.

Good luck! I'll be doing this when I get home... Restore, no backup, and then sign in to iCloud, let it do it's thing, then sync my music.

I totallly agree. Am iPhone 4 user and have been since its launch. Have had all previous versions and every iOS so pretty familiar with what constitues normal battery life on these things. I have a daily routine that sees an almost identical amount of email use, some wifi, some 3g, some location services every day. Since updrading to iOS5 last week I haven't been able to get through the day without flattening the battery. Have resorted to turning off everything I can think of - location services, bluetooth, wifi etc. Under my old regime these were always on. The phone is still not getting through the day. Based on hours usage I would estimate that the battery life has dropped by about 30%. Thats being generous. Looking at whats going on I suspect this is a sloppy release of iOS5 and I'll bet there'll be a quick update. One thing I would be interested to know is if you are syncing to Exchange because I have a sneaking suspicion this is wasting loads of cycles as I seem to now be seeing loads of minor changes to my calendar notifications that didn't used to hapen under the old iOS. Trouble is, if I turn that off I might as well go back to a pager!

All ideas gratefully received.

It must me an app that is not optimized for IOS 5 that is sucking the juice. I have used the phones since 2007 and never had this kind of battery drain.

I had the same problem and brought it to the Genius Bar after narrowing it down to Exchange calendar sync (whenever I shut that off battery life would significantly improve). The best we could do was a restore from new, which helped a little bit. Unfortunately they said at this point, I had to bear with it, especially being out of warranty. And even if I replaced the phone, they couldn't guarantee it couldn't happen again, which makes sense. 😟 Here's to hoping they figure it out and release a fix!

Same problem! Really don't know what to do. There is no more important thing than good battery life. Everything started after updating iOS5. Apple, do something, please.

Had the same problem. Turned off iCloud except Find my iPhone under Mail. Turned off locations services. Left WiFi on but turned off "Ask to Join Network" Turned off all notifications except Mail, Calendar and phone. Turned off all calendars except exchange.

Now back to normal life. Used all day and still at 80%. If you need the functions you can turn them on.

Wonder if this will work for iPhone 4S too?

same problems here with ios5 and iphone4. Phone had 100% charge at 0730am, took it off the charger, checked email once, received two text messages, drove to work. Battery was at 75% by 0930am.

I turned off everything icloud related, then rebooted my phone. Seems to have fixed the battery problem for now. Need to wait a few more hours to be sure, though.

After restoring to iOS 5 and then restoring my iCloud backup everything is back to normal. I disabled push for most apps, disabled location services, wifi, cell network usage when doing iCloud document sync, and I am at 94% after being off charge since 7:00am (it's 10:30 now). However this does not mean apple shouldn't make improvements for the next iOS release. I expect to re enable push for email after that, because my phone worked fine before ios5 when push was enabled all day.

Similar problem. I used to be able to end every day with my iPhone 4 having around 30% battery or so, but after iOS5 I either end the day with around 10%, or I have to charge it during the day. Granted, I listen to music and text a lot, but I did everything that I do now before upgrading and had no problem.

same problem here. I can literally sit here and watch it drain. what's really weird is the problem did not start right away took a few days then showed up yesterday like someone flipped a switch. Went from full work day with no problem to like 2 hours and stone dead..... :-(