Specification: Battery type:Li-polymer Voltage: 10.95V （Compatible with 11.1V） Capacity: 5800mAh / 63.5Wh Cell:6 Cells recharge cycles： 500 Operation time: Around 1.5-3 hours Compatible Part Numbers: A1322 A1278 661-5229 661-5557 020-6547-A 020-6765-A Compatible Model: ( Ctrl+F For Fast Search Laptop Model ) For MacBook Pro 13'' A1278 Mid 2009 Version For MacBook Pro 13'' A1278 Mid 2010 Version For MacBook Pro 13'' A1278 Early 2011 Version For MacBook Pro 13'' A1278 Late 2011 Version For MacBook Pro 13'' A1278 Mid 2012 Version.
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