Hello this is the first time I've ever owned a mac. I switched from a PC last March to buy macbook air. So far, I have no problems. However I just have minor issue with the battery. I take my laptop EVERYWHERE, I take it to school everyday and I like to carry it around the house w/o its adapter because it's so light and portable. The problem is i just bought this laptop last march and I've already gone through 81 cycles. At this rate, I might have gone through 300 cycles in less than a year. My concern is that my battery life will diminish so soon and I might have to replace the battery every year even if I buy applecare because beyond 300 cycles, battery is not covered anymore, right? How about you guys based on your experience with macs, does the battery health really diminish at a significant rate when it hits 300 cycles?