What is the best way to store a battery?

Hi,
I have an extra MBP battery. What is the best way to store this extra battery? Should I store it when it is fully charged? or Should I store it when it is half full? Is it necessary to use that batter once in a while?
Thank you beforehand.
Bob

http://www.apple.com/batteries/notebooks.html
If you're storing it for a long time, put it away when it's about half full. If you have a couple of batteries for your MacBook, I'd recommend swapping batteries once a month or so to extend the life of both batteries.

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