how many cycles do you guys have on your air? I've done 40 and its only about a month old if that ! i always charge my battery to full, then remove the power and drain it right down to 0 or until it turns off. on my previous machine i used to leave the power cord in a lot since i wasn't up and about with the laptop, however this impaired the batteries health and so i am giving this battery the full work out all the time. only thing is, its racking up those cycles, or is that a non issue and the health is more the concern for the battery?