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Amazon.com: iFixit Battery Compatible with MacBook Pro 15" Unibody (Early 2011-Mid 2012) - Repair Kit : Electronics
Amazon.com: New Laptop Replacement Battery for A1278 A1322 [MacBook Pro 13 inch] - (Mid 2009, Mid 2010, Early 2011, Late 2011, Mid 2012), fit MB990LL/A MC724LL/A - [Li-Polymer 6-Cell 66.6Wh 11.1V] : Electronics
Internal Replacement Battery A1382/A1286 for MacBook Pro 15'' (only for Early/Late 2011, Mid 2012) Fit MC721LL/A MC723LL/A - Micro Center
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How to Replace the Battery in a 15-inch MacBook Pro non-Retina (2011-2012) MacBookPro8,2 - YouTube
MacBook Pro 15" Unibody Early 2011 Battery Replacement - iFixit Repair Guide
MacBook Pro 15" Unibody Early 2011 Battery Replacement - iFixit Repair Guide
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MacBook Pro 15" Unibody Early 2011 Battery Replacement - iFixit Repair Guide
Amazon.com: iProPower A1382 Battery for MacBook Pro A1286 15" inch Laptop [Only for Early 2011, Late 2011, Mid 2012 Version] High Capacity 7200mAh 10.95V/77.5Wh Replacement Battery : Electronics
MacBook Pro 15" Unibody Early 2011 Battery Replacement - iFixit Repair Guide
MacBook Pro 15" Unibody Early 2011 Battery Replacement - iFixit Repair Guide
MacBook Pro 13" Unibody Late 2011 Battery Replacement - iFixit Repair Guide
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NewerTech® : Batteries : NuPower® Battery for MacBook Pro 17" Unibody 2011 Models
MacBook Pro 17" Unibody Battery Replacement - iFixit Repair Guide