My new SR MacBook just got delivered 10 minutes ago at my work . I think today I will be leaving the office earlier. It is my first ever Mac and I am so exited. I was reading on the apple battery care (http://www.apple.com/batteries/notebooks.html) and they say: "...Be sure to fully charge your portable when you plug it in for the first time...". Do I need to calibrated it then too, or not?