Battery Life on two 3G iPhones has dropped dramatically since 3.1 update...

Hello all!
I couldn't find a thread with just this problem, so I thought I would start it. My wife and I both have iPhone 3G 16GB phones and using the same apps as before, our battery life has dropped to less than a day for both of us. I would estimate the change as approximately 1/2 of what it was before the 3.1 update. This is in addition to not getting 10% battery life left warnings (we both still get 20% battery life left warnings) and random shutdowns on both phones. Neither of us has added any apps since update to 3.1, so we're using the phones the same way as before the update. Both updates on the phones went without problems.
The only thing I have noticed is when the battery gets to about 50% left on the icon, it seems to drop very quickly. The battery life has definitely dropped noticably, but this is an apparent symptom of that problem. I guess it is possible that it drains at a faster rate for some reason once it reaches 50% remaining, but I can't prove that. It appears that way however, on the battery icon.
If there are any other threads about this issue, please let me know, and I'll post a +2 phones to that list.
Thanks!
Jim

Well, my iPhone 3G too started to loose battery duration and drop just after a 50% usage, but mine has the push activated, even if configured only on the 'manually' option (and I consulted the iCal only one time today, and one time my emails). I started checking with the push set to update every hour (the iPhone lasted 'til 6:30 p.m.), then set it to manual (now the iPhone lasts 'til 8:30 p.m.), while before the update it lasted until 11:30 p.m. at least, with push set to manual, too. Tried deactivating wifi (no changes at all), and have no third-party apps with push option activated, either.
Oh, the 3G signal has full bars strength, so no problems in reception under that point of view.
Message was edited by: Clelia Candita

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