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MacBook Pro 15" Unibody Early 2011 Teardown - iFixit
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MacBook Pro 15" Unibody (Early 2011-Mid 2012) Battery - iFixit Store
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Amazon.com: E EGOWAY 7200mAh-79Wh Replacement Battery A1382, Made for Early and Late 2011 Mid 2012 MacBook Pro 15 inch Core i7 : Electronics
MacBook Pro 15" Unibody Late 2011 Battery Replacement - iFixit Repair Guide
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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-Mid 2012) Battery - iFixit Store