IOS 4.2.1 battery drain

Read the thread you posted to for solutions.

Facebook. A well know offender.

Or email. Read the thread you posted to.

I set up email accounts as new. where I can see the threads for this? Hope will help....

wohooo i just downgrade to 4.0.2 and my problem is solved 🙂

I have noticed this problem.

Is resetting the phone back to factory the only way to resolve this?

Im away on holiday at the moment and i dont want to lose the pictures i have taken whilst away.

Why do apple put stuff like this out and do they ususaly put another update out that resolves it?

Battery drain is just one problem among 3 - 4 symptoms you will find when you upgrade the OS.

After the first time I found many problems from upgrading to 4.2.1, I felt very very bad. Then I found some solutions out there and resolve it and felt better for a few days. Now I found it again occasionally. It seems the problem comes from some background process of the OS itself, the one who used up
- the CPU (bumpy scrolling of contact list, and the disappearing of 'delete' button in the SMS sender list)
- the memory (noticeably longer time to display keyboard)
- the battery (you all know it)

It is nothing about how many apps you are opening because you all know that there is no real multitasking (besides a few apps from Apple) and I have ever opened many many more apps than this time when I had been using iOS 4.1. Actually I have tried closing all apps and reboot twice and waiting for it to close all apps already without success. I know the symptoms will gone when I reboot more and wait more, but this is not what we expect to do, right?

Now I am looking for the trigger of these symptoms as it does not happen all-the-time but once it happen, it is a really big annoyance.

Wait to see if anyone know the perfect solution.

If you have Push email accounts first wait a day for them to finish syncing. If you still have heavy battery drain go to Settings/Mail,Contacts,Calendar, tap on a Push account and turn it off (the account, not Push). Next open the mail app, verify that the account does not appear (and also tells the mail app to stop monitoring the account.

Now reboot (hold HOME and SLEEP until an Apple logo appears). Go back into settings and turn the mail account(s) back on.

The other thing that can use battery is Game Center. If you have EVER launched Game Center go into settings and turn on a restriction on multiplayer games. You will need to set a Restrictions passcode; DON'T FORGET IT!

After updating, I too, have noticed this problem with my Iphone 4 and after reading some of the possible solutions on this forum, I've decided to play around with my phone and see what happens. I have yet to do a restore and setup as new phone, but I have turned off my notifications, and have switched push to manual. My brightness is about 50%, the wifi is off, and only 3 apps running in the background-phone, ipod, and text. So far, with this new set up, I had a full battery at 11:11 last night, and woke up with a full charge this morning at 7. Turning off the notifications seems to be working for me, but I'd be interested in hearing other solutions for the many users out there.

teamshock nick wrote:
I have noticed this problem.

Is resetting the phone back to factory the only way to resolve this?

Im away on holiday at the moment and i dont want to lose the pictures i have taken whilst away.

Why do apple put stuff like this out and do they ususaly put another update out that resolves it?

Supposedly resetting the phone back to it's factory may resolve the battery drain issue. but keep in mind that if update it to 4.2.1, upon restore, it will be 4.2.1.

Here is what I would suggest if you were to restore your phone.
1. back up your contacts, and your photos, transfer all your purchased apps.
2. Restore your phone, probably best if you set it up as "New", as if you were to Restore from back-up, you could bring back the same problem. You will lose all your text messages, contacts, and photos (if you have contacts stored under Outlook, then I would not worry, if you saved your photos to your photo folder in your computer, you should be fine).
3.When you do set up as new. I would suggest putting them back one at a time, contacts first, then after that, then music, then movie, then photos, then apps.
4. As for #3, it's not necessary to do it one at a time but you could just do all at once, which could take longer imo.

Even before restoring you may want to try deleting your mail account, restart your phone, and re-setup your mail account as sometimes the mail could be the culprit behind this battery drain. Make sure Fetch is set to manually and push is turned off.

Yup, I have been experiencing 2 of the symptoms that you've listed ever since I upgraded to 4.2 (cpu and memory) 4.2 just seems really laggy on my phone and it does feel like something is running in the background that's causing the problem. Well, by saying it's laggy I don't mean it's not being responsive or anything. In fact, it's 100% responsive, just all the animations are very jerky. I have tried many things to fix it but none of them helped. However, my battery life is noticeable better in 4.2. Wish I was one of those people who said that 4.2.1 works perfectly on their phones.

teamshock nick wrote:
I have noticed this problem.

Is resetting the phone back to factory the only way to resolve this?

No.

Im away on holiday at the moment and i dont want to lose the pictures i have taken whilst away.

Why do apple put stuff like this out and do they ususaly put another update out that resolves it?

The problem is not a flaw in the release, it is a problem in metadata on the phone that is corrupted by the update. Apple is unlikely to put out another update because it is not a single problem; it has many different symptoms and causes. A few phones have had problems like this after every release in the past 3 years. There is a series of increasingly intrusive steps that you can follow to resolve it; restoring as new is the last resort. Here's the list to try; don't go beyond the step that fixes it. After each step reboot the phone (hold HOME and SLEEP until an Apple logo appears, ignoring "Slide to power off"):

1. Settings/General/Reset - Reset network settings (you will lose WiFi passwords, but nothing else)

2. Settings/General/Reset - Reset network settings (you will need to reset some additional settings, but will not lose data)

3. If you have Push email accounts: Settings/Mail,Contacts,Calendar - tap on the account name and switch it off (the account, not Push). Open the email app; verify the account is gone (and let the mail app know it is). After rebooting, go back to Settings and turn the account back on. Wait an hour before testing to give it time to sync back to the server.

4. Turn off Notifications in Settings. Test for a day. If the problem has gone away you have an app that is using data when it shouldn't be.

5. If you have EVER launched Game Center go to Settings/General/Restrictions and disable Multiplayer games. You will have to set a passcode to do this; DO NOT FORGET IT.

6. Look at the apps currently in the quick launch bar. When on the Home screen double-press HOME. tap and hold any app so "-" signs appear. Kill any apps that might use background such as Facebook, Skype, Yahoo, music streaming apps, etc.

7. If you have gotten this far and not fixed it you probably need to restore as New.

Reset you Network Settings
SETTINGS>>>>>>>GENERAL>>>>>>RESET>>>>>>RESET NETWORK SETTINGS
and you are done

thanks

i just did all these things and will see how i get on.

I also have an issue with not connecting to wifi but i fly home today so its not major (unless it wont work back in the UK lol)

I have litteray followed your advises, swiched off the email accounts (I have three) and restart the iPhone (home and sleep button). What I also did I switch the mail app from the task bar (double-click and hold the app the switch off). Then I have fully charged the phone. What I have noticed this morning is usage time 2 minutes and battery is 100%. I would like to believe that the mail app was the couse for faster draining. I will stay focused on the mail app for the next few days. But if this is true, then I have to stay focused on the mail app all the time, I will have to switch the app from the task bar every time I check my email accounts. By the way I have yahoo, gmaill and hotmail. Last night I have swiched gmail and hotmail completely (from Settings - off the accounts).
Is this the same case with all iPhones 3GS? With iPhone 4 I believe the battery is more powerful and this problems is not noticeable.

It is not a problem with all 3GS phones. It is a problem occasionally with all iPhones and all versions, and I think is actually a protocol error in ActiveSync. It should be OK for a while, and maybe even permanently. It happens in the 4 also.