Singing the iPhone battery blues

My wife and I both have the same model, bought same day, and since 3.0 my phone is still fine, hers is, even with WiFi, 3G and BT off empty within 24 hours. And that is without making a call... She got a new one from shop, but same problem...
Did resets, power off, restore etc, nothing helps...
And I can use mine for days... Strange..
The shop thinks it's got to do with the iTunes/computer you sync with...

Those of us complaining about battery life since the OS 3.0 upgrade are doing so because we experienced decent battery life before the change. After upgrading, many of us are seeing less than half of the previous battery life with the exact same usage patterns. This is a legitimate concern and something ABNORMAL. Not to mention all the heat generated by these devices that have the battery life issue!

After much troubleshooting and trying all of the previously mentioned 'solutions' multiple times, I finally narrowed down the issue on my iPhones to being caused by Calendar syncing with Exchange 2003. With Calendar syncing enabled, the phone goes into a constant broadcast mode and chews through the battery slightly more than twice as fast as it worked before. With Calendar syncing off, but Contacts and eMail on, my 3G actually gets a bit better battery life than before. My 3GS gets close to double the battery life of the 3G!

So, for me, the problem lies somewhere in the Calendar syncing with Exchange. Please note, calendar syncing is enabled with MobileMe, so there are no issues there.

I hope that Apple issues a fix for this soon. I really miss having the full functionality of the device!

I enjoyed the recent article regarding the decreased battery since upgrading to 3.0. I am running 3.0 on a 2G and have noticed the decrease in batt.. life, however, I am using the iPhone alot more now with the availability of the app store and my facebook app.

Is there a way I can find out which apps are a push apps? and maybe I can turn it off? thanks in advanced..

Several bits of advice I can give.

1) Restart the iPhone and do a full recharge to calibrate the battery, repeat.
This didn't work for me.
2) Restore the iphone with settings.
This gave me back my usual battery life
3) Restore the iphone as a new phone
This has worked for others on the net

YMMV but over all I was so happy when step 2 worked I was thrilled, I went from hours of battery life to days.

I've found it to be the opposite:

Having push notifications enabled causes the battery to drain only a minimal amount. About 5% over 8 hours (tested overnight, iPhone in sleep mode).

Having push for email/contacts/calendars enabled causes the battery to drain quite a large amount. About 20% over 8 hours (tested overnight, iPhone in sleep mode).

This was tested on both a 3G and 3GS, getting the same results. Prior to 3.0, having push enabled for email/contacts/calendars did not drain the battery even close to this much.

I've also experienced signal loss since 3.0, both on the iPhone 3G and 3GS, so I'm absolutely convinced there are major problems with the 3.0 software, and they are problems experienced by a great number of people. I hope Apple fix them in the near future, hopefully in 3.1.

Why do so many people complain about the battery life? Ofcourse using push apps is going to reduce the battery life. Stop trying to compare the battery life on the iPhone to that of a standard cheap cellphone that does nothing but wait for a call.

the OS 3.1 does not, so far, solve the battery issue. Whether that changes, we shall see.

I was able to fix this problem by doing a software restore and setting my 3GS up as a new phone. I had initially set it up using a backup from my old iPhone. Before the restore, I was burning 1% every 3-4 minutes; now I'm getting 14-18 minutes per %.

I haven't had any battery problems with my 3GS. I'll count myself lucky at this time.

I would love to stick to NDA, though 3.1 doesn't solve it I too run Beejive All day on Push and MobileMe on push when in standby for just 5 hours the battery drains 30% on my 3G S and when using it in a 20 minute period of just using it as an iPod it drains about 10%