what can i do to help ios 5 from draining my iphone 4 battery?

I have heard if you turn on the airplane mode before you update it seems to help.

Dont know why, dont know how.

Yesterday, with a full charge at 7.30am, at 6.30pm, my phone turned itself off having run totally out of power. Prior to the upgrade, it would be down to about 45 to 50% of charge by this time.

Today, between 7.30am and noon, the charge fell from 100% down to just 8%. I had to get out my backup charger.

I've also noticed that the phone appears hot to touch at times too.

My usage patterns haven't changed. Despite what others have suggested, I've not been using the phone any more than normal, as I'm not too interested in most of the "new" iOS 5 features. I turned off many location services at lunchtime and shut down unused apps, but that's made no difference. And I'm not sure why I should change how I use my phone just because of an upgrade.

<<< Anyone else tried the reset network settings suggestion? Did it work for you? >>>

Tried something that seems to work or at least identify the culprit.

Download this free cpu monitor:

http://itunes.apple.com/us/app/system-status-lite-device/id407752428?mt=8

Open it and scroll down to CPU usage. For an iPhone 4 working normally, it fluctuates under 20% with wifi, location services, push and bluetooth on and 4-5 bars of cell signal. I then turned off 3G and cellular data services (settings --> network) and went back to the CPU monitor. It had dropped to under 20%, just like my wife's phone, which is NOT affected by the upgrade to iOS 5. I then toggled both back on and it has stayed under 20% of usage when not doing anything.

If you have not tried this, please do and report back to see if it's just me or a common issue. You don't need the CPU app, but it was helpful (I even upgraded to the full app and find it useful)....

It's as if it was stuck and "jiggling" the toggle switches fixed it...perhaps this is the culrpit!

I downloaded the system status app. Then I tried turning everything off - location, icloud, etc. Still no change in the CPU usage which was consistently peaking at 100%. I decided to try some of the other recommendations that I have read regarding this issue. I reset the network settings - didn't help. The other advice I read about deleting and re-adding mail accounts seemed to do the trick for me! I re-added my Yahoo email accounts 1 at time and observed CPU usage peaking at 20% even after all accounts were added! Then I turned everything else back on - icloud, location services, push, etc. - and still was peaking at 20%. So far, so good. One note: when I first turned icloud back on, I had several minutes of 100% CPU, probably while the phone was re-syncing everything.

I deleted both of my email accounts and reloaded them, which did not help. Toggling off/on both the 3G and the Cellular Data Services has worked so far. Last night, I took the phone off the charger...put it in my pocket...3 hours later, still 100%....used it thereafter and no problems at all. Interesting...on the 4S (which my son has), you can toggle off/on the Cellular Data Services, but you do not have the ability to do so for 3G. I think the problem lies there and for some of us, the switch is stuck "open", leading to the drain, and toggling them off/on fixes it. Well, at least it worked for me ....and I still have BT on, wifi on, location services on, push on, etc.....

If anyone else has toggled these switches, report back on your results....

I've seen this issue before with a jail broken app on the lockscreen that pole everything like email messages texts alerts etc. what you need to do is go into settings and remove the stock widget from your notification screen. You should also remove the unimportant apps as well. My battery drained to 68% at 11am just sitting there. I did what I mentioned above and I have 50% battery right now at 5:22pm est. give it a shot and pay attention to usage etc. my 50% reading was with me using yahoo sports app for fantasy football facebook and twitter most of the day.

What is BT?

make sure everything is up to date like itunes, internet explorer, or whatever browser your using and you could also try switching usb ports. Switching usb ports worked for me one time for some reason.

BT is short for bluetooth jim011803

You could try:

- Doing the network thing like everyone else said, that helped for me too,

- Turning off Wi-fi when you're not using it,

- And when your phone is unlocked, double click the home button and delete all of those apps there, just like you would delete any other app. Thi does not delete the actual app, it just stops it from running on in the background.

Hope this helps!

make sure you turn off all of your anti virus and firewall before you start updating it. you can turn them back on once you finish updating it. good luck 🙂

i had the same problem with my iphone4. i just reseted all settings, now its working fine.

iOS 5.0.1 is out...rolling out the OTA, but it eventually showed up on my phone. My problems in the past were intermittent, with a HOT phone and serious battery drainage. I downloaded a CPU monitor and noticed that it would jump to 100% usage during the battery drain. Turning on airplane mode, then turning off 3G and cellular data services, then reversing those did the trick for a number of hours.

My new test: I checked it every 30 minutes for 4 hours. It was not on the charger, only resting on my desk. Here's what I have so far for the 4-hour period immediately following the update to iOS 5.0.1 (iPhone 4 ATT, brightness at 50%, wifi on, BT on, location on, Cellular Data on, 3G on, push on, iCloud on -- phone sitting off on my desk, not being used -- turn on screen every 30 minutes to check progress then back off):

9.15AM EST: 100% battery, CPU >80%

9.45AM EST: 98% battery, CPU <10%

10.15AM EST: 97% battery, CPU <10%

10.45AM EST: 96% battery, CPU <10%

11.25AM EST: 94% battery, CPU <10% (checked on this one a few minutes late!)

11.45AM EST: 94% battery, CPU < 10%

12.15PM EST: 92% battery, CPU <10%

12.45PM EST: 92% battery, CPU <10%

1.15PM EST: 90% battery, CPU <10%

After I checked at 1.15PM EST, I checked a few emails and it dropped another point to 89%, but stayed there after 3 minutes of web surfing. Cool to the touch, as well.

Fixed? Possibly...too soon to tell, but definitly SEEMS like it worked for me.

Well.....not going so well...phone is running at 80+% cpu for no reason and running warm. Turning airplane mode on, 3g off and cellular data off lowers cpu usage to the under 20% when idle, and turning them back keeps it there for awhile, but it doesn't last. For me, iOS 5.0.1 has NOT solved my battery problem on my iP4.

C'mon iOS 5.0.2!