Problem with Iphone battry life decreased substancially after OS 3 update,

Hi, I updated my Iphone with new OS and battery life has decreased. Anyone with same problem, any tips?

Yeah mine has as well. Another thread said to switch off the search features - go into Settings - General - Home - Search, untick all the boxes and restart your iphone. That solution works to fix a slow iphone so it could be a solution.
Or switch off 3G, Push, Location Services and delete unwanted apps. Or if you feeling up to it - restore your iphone then start from scratch.
Some people with 3.0 haven't noticed any change in performance or battery life while others have.
My phone is running faster but the battery life has gone down from 2 days to 1.5 days.

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I had made the point that the Handset size (not the "battery size") does not affect battery life.
Furthermore, I wen't on to explain that the batteries are comparable in size regardless.
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Problem with Iphone battry life decreased substancially after OS 3 update,

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