I have a 2010 macbook pro and I want to calibrate my battery (I'm getting around 5.5 hours with just the Intel). On the battery calibration FAQ, it says I can use the computer while its on AC power and while its on battery power. So now I'm at the step when I'm on battery power. Can my usage habits influence the calibration? Also, can I use the Nvidia (with gfxcardstatus) and not negatively affect the calibration?