Should I continue using the old battery? Even though I got a new ONE?

The apple guy have just delivered my new PB 12" battery; I am however thinking of keeping / or not using it for the meantine since I am not using my PB on mobile. I mean, there is no need to unplug it from the power source; The old battery still charges to 100% but shutsdown at 80%. Here are some of my questions:
- Do I need to calibrate my new battery eventhough I dont intend to use it now? Or shall I leave it in the box since I don't need it yet.
- Would it be wise not to use my new battery? I am just afraid to buy again a new after several months. Though I know it is kinda stupid not to use it now after I bought it.
- What would I do with my old battery? it still work for several minutes...(should i use both alternately to prolong the life of my new battery?)
TIPS TIPS, please. Thanks
What I am sure of, is I need to used this new battery as its warranty last for only a year...
Cheers TO ALL!

This may help: http://www.apple.com/batteries/notebooks.html

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