Use of battery v. wall current

I recall reading that Apple recommends against using the MacBook from the A/C all (or most) of the time -- i.e., even if you have the option to do that.
However, I don't remember any recommendation as to how often to run it from the battery.
Is there such a rule of thumb?
Also, when doing so is it best to run the battery down to zero, or is that not relevant?
Thanks.

It's totally OK to use MB with AC power,even non stop.
Check this info by the way...
Apple portable computer's battery does not show a full charge in Mac OS X
Lithium-ion Batteries
Calibrating your computer's battery for best performance

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