IOS 4.2.1 battery drain

Any possibity to go back to the early versions - 4.1?

Your question is actually answered in the thread you posted to. The answer, however, is No, unless you jailbreak your phone. And going back probably won't fix whatever problem you are having, because it isn't caused by the version you have installed, it is caused by a glitch in the update process. Your phone's metadata are already corrupted.

Also, see this message: http://discussions.apple.com/message.jspa?messageID=12601389#12601389

my battery life have greatly improved.

Lawrence Finch wrote:

Mitch Hewitt wrote:
And yes, as an earlier poster had said, one should NOT have to do a "new setup" each time they upgrade. If 4.3 comes out in December, I'm going to hold off until the reports from the field come in. Lesson learned.

I guarantee that you will see reports saying "4.3 killed my battery". As this has been the case for every update since the first. Given this, you will likely never upgrade again 😉

I may not. 🙂 This upgrade didn't give me anything I wanted. I wasn't interested in AirPlay and AirPrint, but I'm one of those that immediately want, want, want.

Luckily, the iPad I just purchased last week arrived with 4.2.1 preinstalled. Of course, it is work perfectly.

Mitch

Hi There,

My experience as fallows, when I updated yo 4.1 my Battery started to drain very very fast and nothing helped at the time. Yet after updating to 4.2.1 the Battery is back to what it was before 4.1 and I am very happy. However; what I have noticed after updating to 4.2.1 the battery losses only 3% over night in about 7 hours with 20 to 30 minutes usage. Now it losses 8% with 1 hour of Usege. So I can see an increase amount of usage over night but with the same setting "nothing changed".

I am still happy with it but I hope it will not increase the standby usage because this what can kill the battery. If in 12 hours standby the phone uses 2 hours of usege it means I can only use my phone 4 hours of talk time insted of 6.

Will see how the it will hold up in the coming weeks.

Debbeh

Restoring back and then setting it as new Iphone actually solves the problem. But, obviously it's a very bad work around. You need to actually reset your phone to factory settings and then sync all the stuff you once put on the Iphone. I would suggest not to restore from the back up as it doesn't solve the battery drainage issue.

Restoring from backup works for some people, but not for everyone. So it's worth trying; the most you lose is another half hour to do it again without restoring the backup.

What seems to have worked the best for me is to use the reset all settings (but not content) button. This does not delete your third party app settings or your folders. I do this just once and then give the iPhone some time to rebuild the spotlight database, or whatever else it has to do before judging battery time ( about three days at least). If you restore, the settings are restored and I think that is where the problem might be. That os why a complete reset without a restore works as well. The reset settings option is even quicker to do than a restore.

Victor Mihajlov wrote:
I have restore my iPhone 3GS with the new iOS 4.2.1 and now its seems to be ok.The battery is like it was before, but still the capacity is significantly reduced with the iOS 4. Previous versions of iOS were much better for the iPhone 3GS

From my own experience (before upgrading to iPhone 4), and comments by Apple Tech, part of the reason for faster battery drain with iOS 4.x.x on the 3GS is because of the added features, which require more memory and processing power. With the 3GS having a slower processer, less memory, and a lower capacity battery, it's not a surprise that it drains much quicker with the new iOS. After upgrading to the iPhone 4, my battery life is back to the same ratio as my old 3GS running 3.1.3. I'm still on 4.1, very hesitant to update to 4.2. Just looking to see if there are more issues than not. iPhone 4 is running great. So I don't want to have to go through the same issues I went through on 3 3GS's in the last 4 months, by jumping on this new iOS like I did with 4.0.

I can confirm this drain. After a complete charge overnight my phone is now at about %50 after listening to only one podcast and receiving one text message. This is inexcusable.

3G is turned off.
Wireless is turned off.
Push notifications are turned off.
Data is turned off (in an attempt to stop the ever spinning tethering wheel).
The screen is set to minimal brightness.

I have no idea what to attempt next other than a complete reinstall of the operating system, assuming that it is a corrupt install causing this catastrophic loss of battery life.

I suggest reading the thread you just posted to for suggestions.

After upgrading my Iphone 4 to 4.2.1 my battery power drains like crazy. Today morning I my iphone was charged completly at 100%. After checking couple of emails and weather my battery indicator shows 96%. What is wrong? Is there gonna another update for this problem?

Please read the thread you posted to. The answers are there.

Lawrence Finch wrote:
Your question is actually answered in the thread you posted to. The answer, however, is No, unless you jailbreak your phone. And going back probably won't fix whatever problem you are having, because it isn't caused by the version you have installed, it is caused by a glitch in the update process. Your phone's metadata are already corrupted.

Also, see this message: http://discussions.apple.com/message.jspa?messageID=12601389#12601389

I rolled back to IOS 4.1. My phone isn't a jailbreak. It wasn't that difficult.

Jonathan Christensen wrote:

Lawrence Finch wrote:

I rolled back to IOS 4.1. My phone isn't a jailbreak. It wasn't that difficult.

I'm very curious in how you managed to do that. Once you upgrade to a newer iOS, the only way to downgrade is to jailbreak your phone. At least that's the only method I've ever heard of. Thanks.