Hello, I want to replace my Macbook Air 2011 13" battery . The local authorised repair center asks for almost 300 euros to replace it, which is a no-no. Then I searched iFixit and found this battery which is significantly cheaper: https://www.ifixit.com/Store/Mac/MacBook-Air-13-Inch-Mid-2011-Mid-2012-Battery/IF188-070-1 But it says Which also is a no-no. Then I found this one on ebay. http://www.ebay.co.uk/itm/251761272961?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:IT It's almost 50 euros, and the seller seems like a very trusted one. It also says that it's a genuine battery. But I really don't want my Macbook Air to go all Note 7, so should I trust a battery off of eBay? What would you do? Thank you very much for your time!