IOS 4.2.1 battery drain

Would you like to try my solution?

Just turn Cellular Data or WiFi ... "ON". After a few minutes, everything is better for my case.

This method solve my problemsss and I have been using it everytime the problem happen. (About once every 2 - 3 days, not everyday.)

Basically, apple's next iPhone 5! Will be more BATTERY EFFICIENT. and they will claim bullockss about great engineering design, with little effort in design and better iOS 5.x. Like the current MacBook air that is just a recycled model. The new MacBook air basically has saved battery life due to the flash/ssd drive.... Duh.. Noticehow they recycle old names with new flash=ssd. Apple is indeed providing great performance though, I noticed better surfing, faster response time. All these hopefully will not be used to plunder and manipulate users for the next iPhone x.

Wow! I am sittingu here watching my little round whirly thing go round and round, as if it it loading a page. Only, there are no apps running nag the page is already fully loaded.

Recently updated to iOS 4.2.1, noticed the battery draining at about 1% every 2 minutes and the phone was warm. Tried switching off everything (all pushes, WiFi, 3G, Cellular Data, Bluetooth) but drain continued.

Deleted my gmail exchange account (for mail, calendar and contacts). Did a reset (held home button and sleep button until the phone abruptly shuts off). Restart. Add gmail exchange account back.

All fixed. Thanks to whoever figured that one out. I just wasted about 3 hours searching for a solution; you saved me many more.

S.

Well.........restored as new.........and........STILL draining battery like crazy.

I just don't understand?

My procedure when new iOS comes out as simple as possible.

1. Update Software.

2. Erase all settings but not content.

3. Wait at least 3 days for battery to regain duration since background configuring causes additional battery drain.

This has always worked for me, however if it had not worked.

1. Restore iPhone as new.

2. Wait at least 3 days for battery to regain duration.

I have a huge number of apps installed with no issues. Skype does cause a little more drain, but that should be expected. It's not as bad as when the locations arrow is showing though. I think Safari may cause some additional drain, but that's about it.

Invest in a battery pack for the few days after a restore or take your charger with you on those days. The worst battery drain for me was on the first update to iOS4. Following updates have not been all that bad.

I don't have exchange e-mail, but if I did, I'd try the deleting/rebooting/re-adding fix that has worked for others.

If this forum has accomplished anything, it's made me understand a little better why the guy who sold me my iPhone 4 insisted that I had to do a "restore as new" when I knew there was a good chance that the erase all settings would work and not require me to reorganize three pages of app folders. I didn't listen to him.

Thanks Tom. Time to wait.

Meanwhile, I notice that when I go into wifi settings, even though my wifi is set and locked on, the
Little wheelie thing beside "Choose a network" keeps cycling, round and round, every 10 seconds or so.

So...every 10 seconds it's spending energy looking for wifi connection when it is already locked on one????

Why?

I also noticed that my battery life was dying much faster, and saw that the "Useage" and "Standby" times were equal, meaning the phone was never actually going into standby, even if the power switch had been pressed, and the display was off!

I tried disabling push, removing email accounts, quitting all apps, and other suggestions, but nothing seemed to change, still identical Usage and Standby times. Rebooting the phone would seem to help, but only temporarily...

In the end, it seems to have healed itself. Battery life has been consistently excellent over the past week, and it looks like the problem might not come back. I wish I knew what solved the problem, though: my friend just called to tell me that his son's iPhone 3G (just updated to 4.2) is suffering from poor battery life, as well as another mutual friend of ours. I guess I'll try to troubleshoot their battery life problem by following Lawrence's suggestions in this thread.

Ok Lawrance.. I have now erased settings before i restored and set up as new.. lets hope this works.. and then restored the back up as you say its suppose to make things better and be able to use things like location settings and have it last 2 days is that what you said yours does?

I don't know about 2 days, because I've never tried to use my phone for 2 days. I charge overnight every night. But I get through a day with some reserve. And I leave everything on all the time (location services, WiFi, Bluetooth, 3G, Push, Notifications).

lawarence can you email me or msn or something cause i want to discuss this with you further cause I get a day out of mine with stuff turned all off nothing more.. if i have push or email on I get half a day out of mine so curious how you getting a full day with everything on like your saying

You have to identify what is using power. Here are the steps I use. They've been posted in the thread several times, but it has gotten rather long. Once your battery life has recovered you don't need to do any further steps.

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 all 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.

I explain what solved my battery drain problem after updating to 4.2 here:

http://discussions.apple.com/message.jspa?messageID=12775063#12775063

I have done all you said lawarance and still not able to activate email or push anytime I do like i said i get half a day if that out of my phone weather on stand by or with usage. So why would this be if your saying you get a full day with all that on ?

added note why after you send 2 text messages your battery starts to drop 1 percent everytime since this update?