The replacement MacBook battery I ordered from Everycharger.com was worse than the 4 year old battery that originally came with my laptop. I contacted them to initiate an exchange, and had a miserable time dealing with their customer "service" department. I sent the charger in to exchange and didn't receive the replacement for over a month. In the meantime, I ended up buying a replacement battery from Apple. I wish I had spent the extra money and just bought it from Apple in the first place. My experience with Everycharger.com has been disappointing to say the least. There is a reason there are no customer reviews on their website!