IOS 4.2.1 battery drain

Please read the thread above your message. It will tell you how to fix it.

Please read the thread you just posted to. It will tell you various ways to fix it.

Here is my observation:

With my existing apps, I've upgraded from 4.1 to 4.2.1, and started facing the battery issues, I'd get it charged at 7:00am @ %100 and around 4pm, it is over to %5 and the device gets really hot. I tried turning down any wifi, push, facebook notifications etc... and none of them helped.

and now I've just did a clean restore and nothing on the iphone, as if fresh from box, and I don't have a battery issue. But once I again synch and restore all apps, and pics etc... same problem is back...

I'm suspicious that, one of the applications that we use commonly (facebook etc...) is not really working well with 4.2.1 and getting the battery down drastically.

I'll try to experiment and put my apps one by one to see any effects on it.

but this issue wasn't there with 4.1 at all... it was working great.

wanted to share my current experience.

Mine seems good with everything but game center on and one push account
http://www.flickr.com/photos/56521471@N03/5221134341

evrena wrote:
I'm suspicious that, one of the applications that we use commonly (facebook etc...) is not really working well with 4.2.1 and getting the battery down drastically.

but this issue wasn't there with 4.1 at all... it was working great.

That's a good possibility. As I haven't seen many compatibility updates to 4.2.1 for the current apps I'm using. I'm sure these will be forthcoming, just a matter of time.

evrena wrote:

I'm suspicious that, one of the applications that we use commonly (facebook etc...) is not really working well with 4.2.1 and getting the battery down drastically.

I'll try to experiment and put my apps one by one to see any effects on it.

but this issue wasn't there with 4.1 at all... it was working great.

For you. But there were people who had the same problem with 4.1, with 4.0, with 3.1.3, etc. all the way back to 2.0 three years ago.

Facebook has been a known source of battery drain in the past. In my experience the most common cause is a corrupted Push email account. I've fixed this problem in prior releases by either turning off or deleting my Push account, rebooting, and adding it back. I didn't have a problem with 4.2.1, however. Other apps that drain the battery include Skype, Dataman, the various Twitter clients, Yahoo Messenger and Game Center. And of course streaming apps, but that is not a surprise.

Read this. Could be affecting battery life to an extent and if so, may have to live with it.

http://www.lightreading.com/document.asp?doc_id=201174&

That article says the update REDUCES network traffic. How does that map to decreased battery life?

After I upgrade my ios last friday, it used more than 60% battery everyday. Before that, it only uses around 20% - 30% a day.

Please read the thread you posted to and you will find tips on how to restore your battery life to what it had been.

I'm not an iphone expert so don't know the answer of how to monitor running processes vs cpu usage? any ideas?

There are applications that can do this, but it shouldn't be necessary to do this It's not necessarily CPU usage that runs the battery down, it is 3G and WiFi communication that is the big battery drainer.

Read this one Lawrence. http://www.thestreet.com/story/10688816/apples-fault-not-att-for-iphone-ills.htm l

an excerpt: +...in an effort to lower power consumption, Apple designed the iPhone to stay in touch with the network through heavy bursts of signaling traffic rather than keep a radio channel open constantly (keeping the channel open drains the battery). The iPhone effectively caused signaling congestion problems like dropped calls and poor connection quality...+

Lawrence Finch wrote:
That article says the update REDUCES network traffic. How does that map to decreased battery life?

If they are now leaving channel open and quite a ways from tower, phone radio may be consuming a little more power.

I have a iPhone 3G on a edge network. I have more battery drainage since the upgrade to iOS 4.2 and I gave everything turned off trying to keep from it