iOS 5.1 Batterydrain issue/problem

I was having no problematic issues with my 4S. Updated to 5.1 and that battery drains fast. It's losing 10% per hour on standby. Not even my 3G was this bad in the battery department.

It also reindexes for spotlight. Mine was drained to nothing overnight after the update, after the next charge it was fine again.

I left my iphone4 with iOS5.1 in standby while I slept. It went from 100% to 20% in eight hours. Is there any way to discuss this issue with Apple tech support without incurring a service charge?

Also, when posters write about restoring the iphone are they talking about pushing the power and home buttons simultaneously (d0ne that twice) or using restore in itunes?

Just venting, but write now I thinking about getting rid of this thing and getting an Android or a Windows phone. I'm almost willing to take the monetary loss.

After an update to 5.1 i lost +- 50% within 4 hours even my iphone was in the Stand by mode the hole time!

And what I also figured out is that Use time and Standby time is always the same .....@@ which is really strange. Anybody an idea? or any hints how to get my phone back on track "since it worked much better with iOS 5.0.1"?

I tried already the restore stuffs and new phone resetting but nothing seems to work.

Thx ^^

When you restore it you have to connect it to iTunes and press the restore button but if u do don't use your back up files from before just start knew

Glad to see that I am not imaging things. I just got off the phone with a very unsatisfying call to Applecare regarding this problem. Since the update, I have not changed my usage habits and yet my battery life is a fraction of what I am used to, going from one to two days down to less than one. I have rebooted the phone (holding home and sleep buttons until it goes into restart) a couple of times to terminate errant processes, to no avail. The phone tech didn't even suggest this.

Anyway, I hope Apple is listening and will follow up. I will drop by the Apple Store this week for further help/complaining if I have time if things do not shape up.

Allan

I have a question. As i was in the process of doing the 5.1 update i started to read feedback about the update and how it was draining the battery and not improving it. With 9 minutes left i "X" out of the install. Because i stopped the install does that mean i didnt get the full update? Can you get a partial updated install? I feel like it now takes forever to charge my phone. Im just wondering if i still have the 5.0 even though i almost did a full intall of the new update 5.1? Thanks.

Hey, I have had the same problem with since I updated to 5.1 version. It seems like the battery goes down by about 10% per hour. Thank you Apple, I have had enough negative experince with iPhone. Waiting for Nokia Lumina 900 release in March.

If you are inclined, go to the App Store and download any of the free system monitoring tools that can display CPU usage. Here is the screenshot of my old iPhone 3GS about 5 minutes after upgrading to 5.1. You can see the CPU burning up at over 60%!

Here is another screenshot 35 minutes later. CPU is down to 8%, which is typical.

I see similar CPU usage on my 4S, also running 5.1. Battery life is fine. If your CPU is high, then start looking for CPU consumers. None of the monitoring apps I've seen can display CPU usage for each process, but if you experiment with turning various things off, you can use the app to see if the CPU usage drops. Maybe you have a rogue app burning up CPU in the background, something is crashing and restarting over and over, or push email is hammering your iPhone.

I hope this helps and good luck!

Thanks for the info, but I've got the processes pretty well under control. As I mentioned, my usage patterns haven't changed, but my battery consumption has,the difference being thae update.

Allan

@Allan

So, you have confirmed that your CPU usage is unchanged between updates but your battery drain is higher? The only other thing I can suggest is to look in Settings->About->Diagnostics & Usage->Diagnostics & Usage Data and see if there is anything unusual, such as a lot of crashes.

Well, there's no way to check a change in the CPU usage now that the update's been done, but my usage habits have not changed. I'm holding the update responsible by process of elimination.

Allan

The update could very well be responsible. Obviously, your usage habits are different from mine and you could be running into bug(s) that I am avoiding by happenstance.

If you didn't check CPU usage before the update, then it's possible that processes are no longer in control. You didn't say whether you checked your CPU usage after the update. What do you see?

Have you tried disabling the usual suspects? Location Services? Push email?

Do you have an app to monitor data usage? Did it change after the update? You can also check data usage via your online AT&T account.

Its wierd how updates effect every phone different. My 4s has had amazing battery power after the 5.1 update. This is the 1st time I didn't have to charge my phone at night after a days use. My iPhone 4 would make it 2 days easliy. My 4s never made it 2 days. Even if I barely used it that day, the 4s wouldn't make it 2 days. Until now.

I called as well and they told me to restore to factory settings. I figured I'd try from the last back up when I upgraded to 5.1, since I was going to have to start all over anyway. It worked from my last back up and the battery life is back to normal, if not better. After initial 5.1 install battery was sucked dry, but the back up restore did the trick.