Original iPhone 3.0 upgrade - No battery life and running warm to hot

What does Apple support say?

Same problem.
I've downloaded the iPhone Configuration Utility and used it to watch the Console Log of the device.
This is what happens:

+Sat Jun 20 10:09:48 unknown CommCenter[29] <Notice>: Telling PDP context 0 to go active.+
+Sat Jun 20 10:09:48 unknown CommCenter[29] <Notice>: connection mask for 0 is 1+
+Sat Jun 20 10:09:48 unknown CommCenter[29] <Notice>: Error (62) activating PDP context 0 that supports types 1: kGprsPdpAuthenticationFailure+
+Sat Jun 20 10:09:49 unknown CommCenter[29] <Notice>: Deactivated PDP context 0 that supports connection types 0x1+
+Sat Jun 20 10:09:49 unknown CommCenter[29] <Notice>: Error (62) activating PDP context 0 that supports types 1: kGprsPdpAuthenticationFailure+
+Sat Jun 20 10:09:49 unknown CommCenter[29] <Notice>: Telling PDP context 0 to go active.+
+[...] and so on+

I think it's because iPhone constantly tries to trigger the internet connection (EDGE or 3G) but, since in my case (and maybe yours) I don't have any mobile internet subscription, it fails.
If this is the problem, it should be easy to fix for Apple.

However, I'll try to find out a way to fix it.

P.S.
Download the iPhone Configuration Utility here:
http://www.apple.com/support/iphone/enterprise/
then install it, launch, and connect your phone. Select it in the sidebar, and click the "Console" tab.

Message was edited by: gigasoft

Update:
since my phone is always trying to connect to internet, I can't even receive calls.
This is very frustrating.

Since I don't have any data plan associated to my Phone (for now), I've probably found a SOLUTION.
Connect with your iPhone to this website: http://www.unlockit.co.nz/ and set up a profile without any APN.
It seems to work for me.

If you have a mobile internet data plan, try to use one of the default profiles on the site, or manually adjust the APN.

Tell me if this helps you.

Here is one for you ... I always have my 3G plugged in at night to the (apple provided) wall charger. It was in airplane mode... I woke up a few minutes ago (2:45am) just in time to see it shut down because the battery was flat! It was extremely hot to the touch. I checked the connections - nothing was loose. I unplugged it and plugged it back in, and it appeared to start charging. Suddenly the battery meter lept from 10% to 50%. I unplugged it again and it dropped to 20%.

What the heck??

This certainly seems to be the key to the problem and thus the solution.

Let's put it to vote... *How many of us have subscribed to a data plan?*

I don't have a data plan.

Same here, Problem just started today, woke up with a dead iphone. Upgraded firmware on the 17th. Wont charge on USB (Intel Imac with all genuine apple connections). Trying to charge it on wall charger at the moment see what happens. Wife is teasing me (very annoying).

I have a data plan - I think there are multiple problems all related to the iPhone's equivalent of background processes. Some are intermittent and will be hard to diagnose, like heavier loads on orig processor due to 3. I think my problem was at least partially the AP app trying to get alerts, some push settings could also be an issue. I would look first at 3rd pty apps that were probably not well tested by Apple. I also like the idea of using the Apple utilities to watch execution of programs, maybe one of the repair services like ifixit can use developer tools to diagnose loops?

Like a couple of posters indicated earlier, this seems to be happening only for phones that do not have EDGE/3G data plan. Somehow Apple has never tested for that scenario OR intentionally penalizing people without data plan (?at the behest of AT&T?)

I think they did not tested that scenario very well.
Here in Italy every sold iPhone doesn't have the carrier lock. They are all unlocked, and many users (like me) doesn't have a data plan.
So, it's probably a bug 😟

I don't have a data plan so with Push on it does seem to cause this problem. Having switched Push to Forward as per my settings in 2.2.1 all is well - battery is fine, heat has leveled off to that of 2.2.1 etc.

Have no intention of getting a data plan where I live in the UK as it is hit and miss coverage. Getting a 3GS after a few pay checks.... but by then I'll be living in a different region so coverage will allow for 3G speeds.

Never the less hope it can be sorted soon!

Exact same issue: I have the original iPhone with the new 3.0 software and I charge my iPhone in airplane mode at night on an Apple wall charger. Sometimes it charges, most times it just gets hot and drains the battery.

Have you tried using a different cable. I had the same problem about the iphone battery after firmware upgrade 3.0 along with the loss of wifi connection, my iphone formerly 3G wont detect any WIFI network at all and even if adding the WIFI network manually, it will return a dialog "Could not find the network "xxxxxx". Called customer services, very embarrassed as i have forgotten to check with a different cable and it resolved the problem, but not too embarrassed as they were not able to resolve the loss of wifi signal issue.

I have a data plan and am experiencing the issue, so I don't think the issue is related to whether or not you have a data plan.

However, I do think it is related to having Push turned on for your e-mail, esp. if you have Push for a Microsoft Exchange account. I urge all of you who are experiencing the issue to turn off Push for those accounts for which you have it enabled and see if that works around the issue.

Also, call Apple Support and complain. If they don't hear from us that this is an issue, they will not be aware of it and will not fix it.

I have noticed the same on my 1st gen iPhone. Battery life didn't even got through quarter of a day at a single charge (In sleep mode that is). First thought something went wrong with the 2.2.1 to 3.0 upgrade. But on a clean restore it was the same...That is, as soon as I set up my MobileMe account. The iPhone responds slow and scrolling is lagging. When I turned off push everything went back to normal. I hope Apple gets this fixed, I use push all the time.