iPhone Update 2.2 Drastically Reduces Battery Life

Same problem here!! And wifi is turned off.

I am having the same problem. I am not getting any more than 4 - 6 hours on standby after updating to 2.2, without even using the phone. I have email fetch and WiFi turned off. It seems to take longer to charge, also, but I don't have an actual baseline to compare that to, just perception.

I had notice a dramatic improvement in battery life when updating from 2.0 to 2.1, and I have gotten as much as 36 hours of standby. But now, with the 2.2 update, my iPhone shows the low battery warning within just a few hours.

Change network settings from 3G to Edge. Much more battery and slower speed.

I changed network from 3G to Edge few months ago. I noticed that the speed difference will not make a difference for me. I have push emails from me.com and I surf the web and app store during the day and the battery at the end of the day is over 70%, maybe more. I prefer battery over connection speed.

One example: This Saturday a friend of mine and me went to play golf. I used my iphone with Fore! (4-5 hours) and at the end of the day I had more than 85% battery. My friend had ~40% (using 3G and he was not using the iphone). I made him change network settings.

Hope this helps.

Battery bug:
I have the same problem. I updated yesterday night to 2.2 and left the iphone charge over night. I took the phone this morning and went to work. I did not use it until mid day when I went for lunch. I wanted to check my emails and saw the battery was fully empty. I could not use it anymore. This was very frustrating. The battery life seems to have drained in only one morning when with 2.1 I rarely used half of the battery at the end of the day (and I checked emails, news and used the phone).
This need to be corrected very quickly as the phone is useless as it is. I would also recommend other users not to update while this bug is not solved!

Not a problem with mine- I still get about three days service with minimal data/email use and not too much talking on phone. More use equals maybe two days of battery life.

Same problem with dramatically reduced battery life after 2.2 installation!!!

I never had more than a day and a half of battery life. But then again, it all depend on the use of it. If as I do, you rely on the iphone and a MobileMe account for professional matters, you can't expect to have much more battery life than this.
However, the latest update makes it useless to me at the moment and I wish I could revert to 2.1.

Thanks, these are great general advises to preserve battery life.
However, if it might help the casual user while waiting for a bug fixe, it won't help those of us who have got use to rely on the Iphone 2.1 decent battery life for business usage which requires more battery draining features.

No change here. I still go 2 to 3 days b4 charging.

Greetings,

I have notice the opposite, if anything, and I run everything on, and I get my two 12 - 16 hour workdays out of it, with my normal use, and I make a lot of calls. I don't play music on it, or SMS stuff, but the normal phone, calendar, and email stuff. I bought it to use as a, are you ready for this? - A phone.......Wow! It's a very very good one, at that.

No kidding, it all works well, and I've seen no degradation of battery life.

Cheers,
M.
********

To be honest, I have not seen any change in battery life. But I will continue to use it with Edge.

I'm having the same problem too.

Same problem here...(sorry I missed this thread and started my own...)

Clearly, some owners of the iphone are experiencing a drastically reduced battery life while others don't. This might indicate that the problem is device specific and depend on the manufacturing date or something like that. In any case, a serious problem exists and need to be addressed rapidly. It might be useful to indicate the iphone type and manufacturing number. Mine is white and while I bought it in France in July, I need to get it recharged before I can access its manufacturing number...

I have the same problem. French iPhone, was no problem before the update but now only around 4-5 hours stand-by.