Do I need to run my Macbook battery flat?

Will I prolong the life of my Macbook battery if I occasionally allow it to run flat?

Running it flat doesn't do anything special, but as Mort mentions Apple recommends that you calibrate your battery every few months as shown HERE.
Calibrating your battery really means calibrating the battery meter. It just resets the meter so that it gives a better estimate of the charge remaining.

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