I renewed the battery of my iPhone as I have been using it for 2 years.
But they changed whole the body, so my iPhone is now new :-)
(but still iPhone 3GS) :-(
It's good as the operation is very smooth. I think some memories
or something was cleared by changing the body.
At the same time, I downgraded the iOS from 5 to 4.
I think it's still better when with iPhone 3GS.
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