The last few days of so my battery is suddenly only lasting an hour or so on my macbook pro 13" when before it was about 6 or 7 hours. On further reading I find out Apple's warranty is for 300 cycles. I check my cycles and I am on 303. I find this rather coincidental that my macbook should suddenly change on the nail. Is this a built in ploy from Apple for people to run out and spend money on new batteries or am I just cynical and it's one big unlucky coincidence?