Rotating Batteries?

I read somewhere that if you have to batteries, it's a good idea to rotate them once an week to maximize battery life. Is this true? And if so, how much charge should I leave in the battery I'm "resting"?

Welcome to the Forums!
It's a good idea, as Li-based batteries perform best when used (lightly). For a 1-2 week storage, charge level doesn't matter. For longer (>3 months) storage, the battery charge level should be around 50%.
See these pages for more details:
http://www.apple.com/batteries/
http://www.apple.com/batteries/notebooks.html
Hope this helps...

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