I am having a similar issue, my battery life is terrible after the upgrade to iOS5. Even with very minor use (a couple of emails & twitter) the battery will not last the whole day. I have also found that my iPhone 4 gets a lot hotter when using apps then it EVER has before. Hopefully they release an update soon that addresses battery and heat issues.
I can't say that's have noticed a difference in performance.
Having said that pushing things to devices does drain battery and with everything from iCloud being pushed it would make a slight difference.
I guess the basic things to check would be
Wifi sync/iCloud back ups (ie how often)
Highly unlikely but could be a memory leak/bug in an app?
Or just a coincidence and your battery is failing.
Perhaps your just playing with it more at the moment.
Hope this helps
I have also noticed what appears to be decreased battery life after the upgrade, though not this bad. Seems many people are noticing problems.
I noticed and changed a couple of settings that seem to have helped.
- first, fully shut off the phone and then turn it back on - i read online this helped some, immediately after the update.
- in mail settings, for the icloud account (I dont use this but it was configured by default) check the sync settings . it defaults to push, which takes more power. you might want to disable push and set to fetch for this and any other accounts you have, for additional power savings
- in settings, location services, scroll to the bottom and tap system services : All of them are defaulted to on. I turned off location-based iads and setting time zone since i dont need those. (I also opted out of the diagnostics and usage as part of the setup, but it was set to on in this screen - i left it on for the time)
- also in settings -- location settings: check the list of apps and verify that only the ones you want, are enabled
These few settings seem to have improved things
Same battery issue here. I could easily go 1.5 days on one charge with my iphone 4 using ios4, but now can't make it through to the end of one day without having to charge it. Plus, I sometimes get a weird 8 second delay after launching Messages or after selecting WiFi in my Settings. Here's hoping they get this fixed soon.
Me too. Full day from battery before the upgrade, 2 hrs battery after the upgrade. Phone is really hot all the time (or is that just the new pocket warmer feature :S) but seriously, I have all the sync and push/pull settings switched off and still no good. I love apple because things just work but not this time. IOS5 has killed it and I am not impressed. d:o|-</
I'd kill all the apps running, shut down the phone, and after restart I'd leave it unused for an hour or so to see how the battery life is. If it's still draining fast, I'd restore the software, and check again without restoring any old stuff. If it is not draining, then you'll have to find the misbehaving app(s), and get rid of it until it's updated.
My phone the first night went from 66% to 33%. After a few shutdowns, it went back to normal...from 88% to 82% overnight.
Overall, the 4s goes through battery quite faster than tne 4, and that's normal with two processors, better graphics, etc.
I'm having the same problem. Turned all the location stuff off, and no help. I also completely restored the iphone firmware and then restored the backup. Same problem.
I did download the iStat application, and it shows some "ReportCrash" and "dataaccesd" programs opening and closing every few seconds. So apparently there is a program that wont stay open so it keeps opening. Which seems to me like the problem.
I too am having this problem... even when I leave it in airplane mode and turn WiFi on so it can sink over night, the phone gets hot (I am playing a podcast that goes off in 30 minutes on a timer... yet I wake to the phone hot and battery draining by 20% in a matter of hours when I wake up for my sleep tinkle.
I've noticed a dramatic imporvement after restoring my phone to iOS5 again, and NOT recovering from the old iOS4 backup. I lost the text messages, settings, and icon layout, but thats about it.
I dont know if it's as good as iOS4 yet, but bettery life is much better after the restore.
I did it at the apple store. I dont know if they did something secret to do the firmware too, but they said they did something special to do more than just a restore. Who knows.
Battery life has significantly improved for me today, which leads me to believe that there was some initial proces running after the upgrade. One guess is Spotlight trying to index all emails and contacts etc.. I had turned it off this morning, but also turned off several other things so can't be sure.