Problem with iPhone battery?

My iPhone 3GS is going dead anywhere from 29-34% battery life. It's done it for two days. Looked online for an answer and all I could find was to do a hard reset which did not work. After it dies, if I try to turn it back on it shows the dead battery with the charging symbol. When I charge it, it comes back on and says the same percentage it said when it went dead. It's like the phone recognizes 29% as 0. What's the problem?

It sounds like it was dropped it in water. Water damage usually cause a circuit problem that reduces battery life. Take it to an Apple Store and they can tell you for sure what's wrong.

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