I recently decided to buy the MBP 13", and today it arrived . I've seen the battery guide, but what should i do now after i charge battery to 100%? 1) Unload battery to 1% and then reload and calibrate it. 2) Unload battery to something like 20% and then reload and calibrate. 3) Calibrate battery and then unload battery. 4) Something else... Thanks!