I was on vacation for about 2 weeks. I left my macbook at home with battery. I tried to turn on the macbook yesterday and it wouldn't power on. So, I plugged AC adapter and it powered on fine. I tried to fix the problem by resetting SMC, but nothing. Today I took it to apple store near my house and tech guy told me it is possible that the battery is faulty, because macbook would not recognize at all. In system information indicate that battery is not installed, even though it is. He advised me to call apple and they should give me a new battery. Then apple tech guy told me battery is just dead and said I have to purchase new one because it is not covered by warranty. I am very confused, because my battery was in good condition (less than 100 cycle). Also, from my understanding, even if the battery is dead, macbook should recognize battery as installed. Is there any other option for me other than buying a new battery? Based on my knowledge and tech guy from apple store who physically examined the battery, I believe the battery is faulty. I wouldn't mind paying for new battery if it was wear out, but I don't think it's the case here. Any suggestions?