Hello - As a follow-up to this thread, my 2012 13" MacBook Air battery does not live up to expectations. I took it to the genius bar and the best thing they would do is replace it for $129 and give me a 90 day warranty on it - w e a k in my mind. I would like to tackle this project myself to save some money. I see this battery on Amazon for ~$50 from CSE: http://www.amazon.com/CSE®Laptop-Battery-020-7379--661-6055-Mid-2011/dp/B00RE72OKG/ Has anyone used one of these batteries before? They claim 1 year warranty and it looks like it comes with the tools necessary. Just wonder what others thoughts on the repair job and this particular product. The iFixit guide doesnt look too difficult. Thanks!