How do I find out if my iPhone 4 needs a new battery?

The battery on my iPhone 4 has started losing battery strength much quicker than it had before. It is a refurbished one I got from an apple store when I had an issue with my first one ( not the battery) .  I havent had this refurb phone for more than 8 months.  Any ideas??

Battery life never gets better, but how quickly is it depleting?
If it doesn't last a day then it would be too inconvenient to tolerate. Only Apple can make the determination if it qualifies for replacement under AppleCare.

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    jeffr747 wrote:
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