How do I check or test the health of my iphone battery?

Two related questions:
1: Is there an app or desktop computer test to check the health of the iphone battery?
2: My iphone 3GS is now 2 years old and I sense the battery capacity is declining.  Apart from it seeming to run down faster, occasionally, it sometimes shuts off instantly when between 5% and 30%, without warning. Is this 'sudden death' the symptom of a dying battery or more serious hardware failure?  At these times, when I connect the phone to a charger again, it will reboot and show the original charge level when it last switched off.
I don't want to bother to replace the battery if the problem is more underlying.
Thanks

Visit the Genius bar at your local Apple store and they can test it for you.

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    Report generated September 16, 2014 at 4:59:11 PM PDT
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