This is probably a dumb question, but I've googled to no avail. I've read all the advice and everything about how to properly care for you macbook battery, but I'm still confused as to one thing: What is a battery cycle? How is it defined? I thought a battery cycle was a fully charged - fully depleted - fully charged again. However, on receiving my Retina Macbook Pro yesterday and charging it up fully once, I'm already on 2 cycle counts. I read somewhere that one guy who had a regular Macbook Pro was on 48 cycles after 14 months. I want to do what he's doing haha!