4.0.1 Battery Life

This is the exact problem that I am having. My battery is now almost as bad as the 3g it replaced. I wish I wouldn't have upgraded it so quickly. I hope more people voice their problems about this so it will get fixed.

do you have a app running in the background? It is 10:44 and I have 68% left, I will put it on the charger when I go to bed, the first 2 days I was horrified at my battery usuage then I discovered one of my apps was running and eating the battery, I make sure to turn that off after I use it and my battery life is much better now

Go through the archives of this forum and you'll find posts like this after EVERY UPDATE since 1.0

Go though the basic troubleshooting steps described in the User Guide (you did read this first, right?):

Restart, Reset, Restore with backup, Restore as new.

I also got serious battery problems after updating from 4.0 to 4.0.1. iOS 4.0 worked just fine. My phone is iPhone 3G, so there's no multitasking.

I tried several steps: I shut down the phone, restored from backup, restored to factory settings, etc, but nothing worked.

The battery was draining faster than my USB port could charge the phone, so that the phone was off in the morning.

I finally installed back the 4.0, after of which the problem was gone.

Juha Ranta wrote:
I also got serious battery problems after updating from 4.0 to 4.0.1. iOS 4.0 worked just fine. My phone is iPhone 3G, so there's no multitasking.

I tried several steps: I shut down the phone, restored from backup, restored to factory settings, etc, but nothing worked.

The battery was draining faster than my USB port could charge the phone, so that the phone was off in the morning.

I finally installed back the 4.0, after of which the problem was gone.

So why are you complaining in the iPhone 4 board? Go complain on the 3G board instead. Completely different hardware in each phone so they will be able to help you more than on this board.

modular747 wrote:
Go through the archives of this forum and you'll find posts like this after EVERY UPDATE since 1.0

Go though the basic troubleshooting steps described in the User Guide (you did read this first, right?):

Restart, Reset, Restore with backup, Restore as new.

I knew it wouldn't be long before the "update killed my battery life" messages would show up. Usually a complete reboot of the phone fixes the problem.

I'm having the same battery drain issue!
I left my house at a quarter to 9am and had one call last 1 minute and another lasting for 3 minutes. No games, no push notifications and no other app running. By noon my phone was at 50% I didn't use my phone at all and that taken me though the day. By 6pm my battery shown 40% as I was leaving work. I didn't charge my phone until it was completely dead and that happened around 7:15am. If you don't use phone seem to last a very long time but once uses the simplest thing takes from the battery. I started this post with 100% now it's at 95%.

I'm having the same problem. I have been 'googling' since Saturday trying to figure out the problem. I'm going to roll back to 4.0 because this is horrible. I have tried everything but still lose 1% of my battery every 3 minutes or so. I didn't have this problem until updating to 4.0.1.

How did you roll back? I to 4.0 from 4.0.1 ?

Message was edited by: br01985

I meant. How did you roll back to 4.0 from 4.0.1 my battery is so bad now that i am on 4.0.1!!

I had this same problem this morning and i have not updated to 4.0.1 yet. So i fugured it was an app that didnt turn itself off in the backround so I rebooted it and its doing just fine now. Kind of wish there was a way to close the apps from running in the backround instead of having to restart.

I was happy that my iPhone 4 had none of the problems the media's reporting. I got my phone on 6/26. Battery life during normal use was about 36 hrs. Specifically:
Charge from midnight to 6am
Use during work day
Leave work at 4:30pm and have about 75% of battery left
Use rest of night
At about 10pm would have about 55-60% left
Sleep, don't charge

Upgraded to 4.0.1 and now it goes from 100% at 6am to 88% at 8am.

Call Apple and they told me the usual fixes, described here, with the twist that they wanted me to do a restore and NOT load anything onto my phone and see if the battery issue remains...because "its most likely due to third party software you installed".

Holy **** - so I have no problems with the phone and the only change I made was to download Apple's patch and now the problems I have are due to 3rd party software?

Same deal, I was loving my iPhone4 battery life up until 4.0.1 update. No new apps or changes in terms of settings to warrant the change in behavior since 4.0.1 install. I did a restore from last backup and no change. Is there a way to revert back to 4.0?

Same here, updated to 4.0.1 on my iPhone4, battery life fell off the edge of a cliff, loses 80% idle overnight

thompsontoyota wrote:
Kind of wish there was a way to close the apps from running in the backround instead of having to restart.

To stop running apps in iOS4, double-click the home button to bring up the app switcher, press and hold the app you wish to quit (similar to when arranging icons), tap the negative button when it appears. Note: the app switcher shows recently-used programs, not just running apps (as I understand). The further to the left the more recent, and the more likely they are still running in the background. Hope this helps.

Sometimes you will need to restart, especially after installing an update to the system software, but you shouldn't need to more often than that. Hopefully the 4.1 update will fix this problem.