Which battery is better?

So I have two black macbooks, same specs. I want to keep one and sell the other. Though it may seem sleezy, I want to keep the better battery (since I guess I can switch between them). Is there a way to tell (besides just timing each and letting the battery drain) which battery is better/has been used less/etc.
Thanks

To expand on Templeton's post:
System Profiler is in Applications>Utilities. Click on the Power option in the left-hand column. Check the Battery information.
As Templeton said, you want the battery with a higher Full Charge Capacity and lower Cycle Count.
~Lyssa

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