My iPhone 4s keeps turning off randomly

Last month my phone would charge and when I will be around 40% the phone would just die turn on and die again. I had the battery changed and it was fine for about a month. Just today I took a picture and my phone died at 30% when I press it it shows me the battery to charge it and then when it turns on again it says 30%! What is wrong?

Try restoring your iPhone or simply updating. A lot of IPhone 4s users running iOS 5 have complained about this.

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