Just want to say thank you! You are selling a formidable battery here. I bought one over at eBay for 50 dollars or so and it works, but only gives me app. 2 hours on a full charge. The battery I got from fixit is a little more but still not as expensive as a proper Apple battery where I live and I get around 6 hours on a full charge. I did a calibration, even though I read somewhere else it shouldn't matter when the battery is internal and "non-removable". Thanks again.