Iphone 3gs battery problems with os 4

I am facing unusual battery drain issues with iphone 3gs with os 4. The phone is getting off suddenly @ 30% battery power. Sometimes the battery drops from 100 to 85% suddenly etc. I read in some posts that even 5.01 is having the same issue with iphone 3gs. So I am afraid of upgrading to os5. Everything was fine at OS 4.2. Any suggestions ?

i'm sick of everyone popping into these threads and saying "check your settings, or disable push/wifi/other features".
These features all worked fine on 3.1.3 for me. I have restored my iphone 3GS as a new phone, reapplied my settings manually (not from a backup) and I still get this issue.
30 mins ago I put my phone in my pocket with 50% battery. Pulled it out just now, its toasty warm, and has 19% (wait no just dropped to 18% as I unlocked it) battery left.
Obviously, something is going wrong in the software, and is using cpu resources constantly, draining the battery life. CPU usage explains the phone being exceptionally warm. Having push enabled on an exchange email account (Google Hosted Apps here) shouldn't tax the cpu like that.
I'm taking mine into an apple store tomorrow and asking for a replacement. My warranty runs out on the 19th July, and i'm not going to wait around for a possible 'fix' and then be told "sorry its not under warranty anymore".

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