Determine battery cycle count for Mac notebooks - Apple Support
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Laptop Battery for Apple MacBook Air 13 inch A1466 ( Mid 2012 , Mid 2013 , Early 2014 , Early 2015 , 2017) A1369 (Late 2010 , Mid 2011 Version),Fits A1496 A1405 A1377 - Walmart.com
MacBook Air (13-inch, Mid 2011) - Technical Specifications
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Very poor battery life in mid 2011 Macboo… - Apple Community
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Used OEM Apple MacBook Air 13" (Mid-2011) Battery | eBay
Battery Life - The 2011 MacBook Air (11 & 13-inch): Thoroughly Reviewed
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MacBook Air 4,2 13-inch (Mid-2011) specifications and other info
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