4.0.1 Battery Life

I am not releasing any information Apple has given me, I am releasing information I gave gained through my own experience of a specific version of software.

Wrong. You best read the agreement again, or get a lawyer to explain it to you. Apple insists that you do not publicly discuss anything about the beta except in the confidential developers beta forum. You are risking losing your developer status and civil prosecution.

modular747 wrote:
Wrong. You best read the agreement again, or get a lawyer to explain it to you. Apple insists that you do not publicly discuss anything about the beta except in the confidential developers beta forum. You are risking losing your developer status and civil prosecution.

Ok, well that's not how I read the agreement, but I'll hold off on making any response until I get clarification.

Guys seriously,,,what's with this argument over Contract...the main issue is the batter drainage,,,i updated the iphone 4 from iOS 4.0 to 4.0.1 and having the same issue where the battery is getting drain very fast. I don't remember may it was Engadget or TUAW where they were talking about the same issue and Apple might have the fix in 4.1. Correct if i'm wrong and that goes out for everyone including the Apple Reps.

Note: if anything is posted on Engadget regarding to Apple, it gets Notice for sure. So guys if you want your voice heard send your comments to Engadget.

That's a true statement and, as Apple even state it in their battery tips: "Update to the Latest Software -Always make sure your iPhone has the latest software from Apple, as engineers may find new ways to optimize battery performance." http://www.apple.com/batteries/iphone.html

We're all here to help get the best out of our units even if Apple are slow on the uptake. After reading previous threads, I have already managed to get a clear working idea of how to correct my phone queries 🙂

On further investigation, it does seem to be my Exchange accounts that are causing this battery loss. I ran the phone all of the yesterday with no Exchange accounts. Whilst there is still some unexplained usage, battery life was significantly better (back to the level I remember). I added the Exchange accounts before I went to bed, and by this morning, battery level had dropped from 66% to 50%.

I have always had these 2 Exchange accounts, even on my iPhone 3G, and they are only causing battery drain issues since 4.0.1 as far as I can see.

Interesting. Both my mail accounts (hotmail & web domain) are always on but without Push enabled just manually when I open the mail app. Replacement handset seems to be doing better after it's 2nd long charge from 28% - 100% + 1 hour on Wed night. Today I am on 58% with 1 day 2 hours standby and 4 hours 34 mins usage and have noticed a drop in % every 15 minutes or so when used, 0% when on standby. 3G does make it drop more with great signal but I can live off wifi. This is fairing well 🙂

The iPhone 4 has a great battery, and no doubt there are several ways to conserve battery life. But I believe there is a fault with Exchange accounts - they are draining the battery way too fast. Everyone knows that push reduces battery life, but this just isn't right.

Here's the deal. There is some sort of bug in the email app that can keep it running in the background, even when the phone is not being used. I have been having battery issues ever since getting the phone, and I finally traced the problem back to the MobileMail process. I used Servin's Process Log app to help track down the troublemaker. The battery can drop around 3-4% every hour when the MobileMail process is running and the iPhone is not in use. FWIW, I'm only using a single Yahoo account.

Solution:
I recommend going into the multi-tasking list and removing the Mail icon after using the mail app right before you put it in sleep mode. Be sure to do this every time you have used mail, otherwise it could quickly drain the battery. This does NOT appear to be related to the push/fetch schedule, as I have had my phone on manual fetch while having the quick drain problem. Whatever the process is doing, it is definitely not updating the inbox.

Hopefully Apple will be able to fix this soon in an upcoming patch. Having to manually turn off processes like this is annoying. I don't think the multi-tasking functionality is ready to be rolled out yet. And you shouldn't need a 3rd party app just to see what processes are running.

This is interesting - I'm having the same problem - exhange account with no push or fetch is draining the battery at about 2% per hour :

http://discussions.apple.com/thread.jspa?messageID=12022088&#12022088

The thing I've noticed though is that just closing the mail ap doesnt help (i.e closing from the mulittask taskbar). The only solution I've found is to restore the phone as new and just not setup any exhange accounts (bit drastic). I guess this then stops the process you mention above.

Has anyone submitted this bug to Apple via the feedback form ?

Message was edited by: Flamehearted

Message was edited by: Flamehearted

I have been doing some testing over the past few days and I see the issue as follows

1. Switching off push does not help
2. Closing the Mail application does not help
3. Restoring the phone as new then adding the Exchange accounts from scratch does not help
4. The issue seems to have only started since updating to 4.0.1
5. The issue seems to be affecting Google Sync users (exclusively?)
6. Removing the Exchange account(s) sees the battery life return to normal

You could try getting an app that shows you which processes are actually running, just to make sure MobileMail or something else isn't still somehow active. I've been using Process Log and SysStats Monitor.

Interesting that you mention it seems to affect google sync users. Although I use IMAP for my gmail account, I do use google sync (activesync) to sync my contacts over the air. It's set to manual schedule though. I might try disabling and removing it altogether and going back to syncing them via itunes, to see if that makes any difference.

I had no idea this was introduced at 4.0.1 either. I only bought my iphone a few days before 4.0.1 launched, so I didn't really notice it until I after I had applied the update. I hope apple can isolate which process is draining the batt in standby, as battery life while using it is fantastic. I managed over 10 hours of video playback the other day, and I'm confident my battery is fine. It's only while in standby that I see a problem (usage raising around 5-12 minutes p/hour, battery draining approx 2% p/hour).

I can only assume it was introduced at 4.0.1, since I didn't have the issue with 4.0. Unless 4.0.1 coincided with a change at Google's end...

+6. Removing the Exchange account(s) sees the battery life return to normal+

Actually the odd thing I've noticed is that this is not the case. Although the battery drain slows down it is still present at about 1% every couple of hours.

If you restore the phone as new and install everything again apart from exchange account you'll see what I mean - you get no drain at all over a 7-8 hour period on standby.

you SHOULD get a drain of 1% every 3 hours...it has 300 hours of standby. so 7-8 hours with no drain should be impossible.