IPhone 3gs Randomly Turns Off?

My dad had got an iPhone upgrade and so he had the iPhone layin around the house, so I put my sim card in it and I was using it as my phone. But the problem was I would charge it to 100% then it would all of a sudden turn off and the battery % would be at 94%… Anyway I guess to increase the battery strength. Its out of warranty so I'm not sure what the Apple store could do for it.
Thans 4 your help.

Can be several answers. First off I would try removing the sim card, booting the phone (plugged in) and running it without a sim card for a while. We have seen a bad sim card cause these type off random shut off issues. Another is that something may be wrong with the logic board - causing it to draw more than standard power out of the battery and causing the phone to shut down.

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