Comments on Daniel Schneller's Blog: iOS 4.2.1 battery drain on iPad

The battery drain problem after installing iOS 4.2...

2010-12-23T04:48:18.994+01:00

The battery drain problem after installing iOS 4.2.1 is "Find My iPhone".
(it keeps running on the background, thus drain the battery even if you don't use the machine).

Just do these and the battery problem will be fixed :

1. Turn OFF "Find My iPhone" (setting->email->MobileMe)

2. Install this profile from the iPhone :
http://support.apple.com/kb/TS3398

Hi there, While being thankful for your great expl...

2010-12-05T15:38:12.205+01:00

Hi there,
While being thankful for your great explaination, I would like to share my experience as well.
I just bought my iPad a few month ago and it was actually my first Apple stuff. The most amazing thing that attracted my attention was it's battery life, as you mentioned, It used to remain in 100% charge for days in standby mode (it has the 3.2.2). Now it's a while that I've come with this 4.2.1 and it wont stand almost a single day without regarching!!(of course not in standby, but anyway).
Besides, as there was almost nothing mentionable in this new iOS (well, maybe except the Foldering), I'm thinking to go back to the old version and wait for a newer one.

P.S: The reason i say there is nothing good -for me- in the new iOS is:
My HP wireless enabled printer doesn't work with it's printing function;
My Samsung wireless enabled TV won't play anything from it (it does from my old DLink storage very well!)
The multitasking is not useful at all (as you mentioned comprehensively).

Great post! When I installed iOS4.0 on my 3GS, it...

2010-12-04T19:15:37.345+01:00

Great post!

When I installed iOS4.0 on my 3GS, it totally killed my battery life. I think it was due to rogue apps continuing to function in the background, particularly the Mail app. This problem seems to have been even more pronounced when my 3G signal was very low. Mail or other background apps continually try to reach a server, and it ends up draining my battery. Upgrading to 4.2 has fixed this problem. I won't go into detail how iOS4 has just about killed my friend's iPhone 3G.

I have not updated by iPad to iOS4.2 yet because of the battery drain fear. The biggest problem is that the OS has no way to notify the user when background tasks are being completed. I imagined two solutions for this problem: 1)Create a user edited 'white list' that will grant apps background process privileges. 2) Notify the user in the task switcher which apps are actively performing a background task. This can be done by a visual cue such as the app being highlighted or the progress bar being shown.

Thanks for the great article!

I have in the meantime Updates both my WiFi iPad a...

2010-12-03T06:59:09.028+01:00

I have in the meantime Updates both my WiFi iPad and my iPod Touch 4th gen to iOS4.2.1. While the iPod for some reason Heeres to be restored and synced again from scratch, the iPad update went through smoothly. I enabled Find my iP[ao]d on both of them and have WiFi, Push and Location Services enabled on both of them.
Neither show any signs of increased battery consumption, esp not when in standby. I left my iPad on standby after a Full Charge and found it still at 100% after 2 days when I got back to it. But that's just my experience.

I had the same battery drain problem and also look...

2010-12-03T06:11:47.620+01:00

I had the same battery drain problem and also looked on the forum that you described. I also agree with you about the manner of a certain person on that post. People skills go a long way. However, the person did provide a good link: http://manuals.info.apple.com/en_US/iPad_iOS4_User_Guide.pdf I went to page 170 (as he also suggested). Read through it, then deccided to fully reset my ipad as per instsructions. The issue seems to have been solved to an extent. Will post back on here if it didn't work. I still expect there to be some battery drain, but not to the large extent as before. In the end, good advice, just needed to be provided in a nicer manner.

Yep. There is increased battery drain using time a...

2010-11-30T09:29:02.715+01:00

Yep. There is increased battery drain using time and not battery indicator.

I don't want to register on the Apple forums t...

2010-11-29T21:09:11.317+01:00

I don't want to register on the Apple forums to post this, but yesterday my battery went down 25% in 90 minutes. Today, after "closing" everything on the taskbar, it was back to normal, going down about 10% in an hour.

So I get what you are saying, but I also know what worked for me.

Since you identified my post, I feel obligated to ...

2010-11-29T19:18:06.651+01:00

Since you identified my post, I feel obligated to post. I have NEVER suggested that any specific individual is not experiencing a battery problem. I did ask repeatedly that they determine if a problem really does exist rather than merely assume it from the battery meter.

Great explanation!!!!! I upgraded to ios 4.2.1. Th...

2010-11-28T23:18:54.210+01:00

Great explanation!!!!! I upgraded to ios 4.2.1. The battery drain is not bad but not great either if you're used to ios 3.2. When active battery drain appears find. But in stand by mode I lose about 4-5% in 1 day compared to 0-1% with ios 3.2. I can confirm this because I've downgraded. Still can't work out what is causing the drain.