The MacBook Pro 15" Retina 2015 battery (A1618) has a capacity of 99.5Whr at 11.36V. They are electrically compatible, but have the connector in a physically different location. (The MacBook Pro 15" Retina 2012-2014 batteries are the same capacity at 95 Wh 10.95 V. The 2009 battery has a lower capacity at 73 Wh vs the 2010 battery (A1321) at 77.5 Wh. The MacBook Pro 15" 2009-2010 batteries are electrically compatible.
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