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Old 12-05-2010, 10:11 PM   #1
Mirrorlike
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Did iOS4 reduce anyone else's iPad battery life?

I used to get ~15 hours, now it feels closer to 8 or 9. It's still enough to get me through the day, but I'm a bit disgruntled about seeing 15% battery life instead of 56%.
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Old 12-06-2010, 04:17 AM   #2
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I don't have an iPad of my own, but the girlfriend does and she definitely noticed a bigger battery drain. The rest of the internet has as well, according to Google. Most seem to think it's the addition of multi-tasking and improperly-behaving apps. Of course it could also just be iOS 4 is more resource-hungry than iOS 3, as evidenced by its poor performance on iPhone 3G models. I personally didn't notice much of a battery difference between 3 and 4 on my 3GS, but then I jailbreak and was using multi-tasking apps on 3 so I was already using a fair amount of battery per day. As long as I plug in each night before going to bed, I have enough battery to get through the day.
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Old 12-06-2010, 07:54 AM   #3
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You know, I have noticed this increased battery drain too. I was wondering, "why does the battery suddenly hold less of a charge?" But now that you mention it, it started right when I upgraded to iOS4. So that's solved the mystery, at least. Thanks for the post!
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Old 12-06-2010, 07:58 AM   #4
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Has there been any iPad that has NOT run iOS4? I thought that's what it originally shipped with, isn't it?
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Old 12-06-2010, 08:38 AM   #5
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iPad came out with iOS 3.2.x
4.2.1 update came end of November

I don't think its draining the battery. At least I don't see this happening with my pattern of usage
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Old 12-06-2010, 09:25 AM   #6
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I haven't noticed any difference, but I haven't had time to use my iPad for long stretches since I switched to 4.2.1.

I have two iPads, one of which I haven't upgraded and have loaned out. If the borrower decides to return it, I'll compare the two against each other and see what happens battery-wise.
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Old 12-06-2010, 10:40 AM   #7
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I ran into a worse problem with my 4G Touch where it would drain the battery badly when in standby. It had nothing to do with multitasking, or bad apps or push. It was a wi-fi drain. I turn on airplane mode and it can go weeks instead of 1 day.

My iPad doesn't drain when in standby but I felt like the battery drain was going faster when I upgraded to 4.2 but I still get around 9 hours. It's usually ~5% per 30 mins for the things I do.
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Old 12-06-2010, 01:07 PM   #8
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Quote:
Originally Posted by toddos View Post
The rest of the internet has as well, according to Google.
i can't believe I forgot to check first..

http://discussions.info.apple.com/th...403&tstart=135

According to those guys, wiping & reloading from backup will solve this. I'll post when I have results, hopefully by Friday.
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Old 12-07-2010, 12:43 PM   #9
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I was experiencing quite fast battery drainage as well after installing iOS 4.2.1.
I plugged my iPad to my desktop and iTunes last night, and clicked the restore button to make a "clean" install of iOS 4.2.1.

I was quite dubious about what the results would be, but I have to say that to my surprise it does really seem like my battery drainage is now back to what it was before. I need to use it a bit more to be absoultely sure, but it does really look like it!!

So everyone who is thinking their battery is running out really fast, I would highly recommend trying this!
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Old 12-08-2010, 12:53 PM   #10
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Quote:
Originally Posted by devastat View Post
I was experiencing quite fast battery drainage as well after installing iOS 4.2.1.
I plugged my iPad to my desktop and iTunes last night, and clicked the restore button to make a "clean" install of iOS 4.2.1.

I was quite dubious about what the results would be, but I have to say that to my surprise it does really seem like my battery drainage is now back to what it was before. I need to use it a bit more to be absoultely sure, but it does really look like it!!

So everyone who is thinking their battery is running out really fast, I would highly recommend trying this!
Thanks. Good to know before I take a long flight.
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Old 12-08-2010, 01:03 PM   #11
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I was forced to wipe and reload due to an entirely different issue. I actually think my battery is lasting longer. I concientiously close my unused apps though.

With 4.2, exiting an app by pressing the home button no longer necessarily closes an app. When you double click the home key, you can see in the task manager which apps are still running. Some but not all of those may be pulling power from your iPad. To truly close them, you must first double click the home screen to bring up the task manager, then press an app icon until it goes jiggly (like moving or deleting on the home page), then press the little minus sign in the corner. The app will disappear from the task manager, and it will be closed.
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Old 12-08-2010, 02:53 PM   #12
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I can now confirm, that this "technique" definitely worked for me. Its now 32 hours since my last charge, and my battery meter is showing 65%

Before I had to charge my iPad at least every other day even if I wasn't using my iPad much..
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Old 12-08-2010, 03:43 PM   #13
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I haven't noticed any difference in battery life.

If you're experiencing battery drain, check for multitasking apps that may be running in the background.
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Old 12-08-2010, 04:41 PM   #14
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Quote:
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I was forced to wipe and reload due to an entirely different issue. I actually think my battery is lasting longer. I concientiously close my unused apps though.

With 4.2, exiting an app by pressing the home button no longer necessarily closes an app. When you double click the home key, you can see in the task manager which apps are still running. Some but not all of those may be pulling power from your iPad. To truly close them, you must first double click the home screen to bring up the task manager, then press an app icon until it goes jiggly (like moving or deleting on the home page), then press the little minus sign in the corner. The app will disappear from the task manager, and it will be closed.
Not 100% correct. The double-click tray just shows "recent apps", not necessarily "running apps". Deleting a multi-tasking app from the tray should stop it, but deleting a non-multi-tasking app from the tray does nothing. Apps have to be multi-tasking enabled in order to multi-task.
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Old 12-08-2010, 05:24 PM   #15
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Not 100% correct. The double-click tray just shows "recent apps", not necessarily "running apps". Deleting a multi-tasking app from the tray should stop it, but deleting a non-multi-tasking app from the tray does nothing. Apps have to be multi-tasking enabled in order to multi-task.
You are correct. But I don't usually know which are which.
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