A1322 A1278 Replacement Battery for Mac Book Pro 13" A1322 A1278 (Mid 2009, Mid 2010, Early and Late 2011, Mid 2012 Version)10.95V 6000 mah / 65.5 Wh Capacity: 6000 mAh / 65.5 Wh; Cells: 6-Cells; Voltage: 10.95V Compatible Models: Macbook Pro 13 Inch A1278 (2009 2010 2011 2012 Version) Grade A cells can protect overcharge, ensure low power consumption, safety, and stability. It would not make your devices overheating Replacement MacBook Pro battery can last about 4-6 hours under normal operation. But the actual operation time will depend on your device(system, the light of the screen, hardware/software being run as well as power management settings) and the way how you use it
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