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Best Supply Chain in the World We handpick our suppliers and often times use the same suppliers as the original manufacturer uses. Stellar Customer Service 2 hours average email response time, 24/7 365 days a year.Better Warranty Our 3 years warranty gives you a peace of mind knowing this will be the last battery you have to purchase for a long time.1 Million+ Happy Users Since 2010 This is a badge of honor that we are extremely proud ofCommitment to Continuous improvement Our staff and management continually push the envelope to bring you perfection in quality and serviceCompatible Apple Models:Apple Macbook Pro 15.4 inch Early 2011 Version: - MacBook Pro 15.4 2.0GHz Core i7 (A1286) - Early 2011 (MC721LL/A) - MacBook Pro 15.4 2.2GHz Core i7 (A1286) - Early 2011 (MC723LL/A) - MacBook Pro 15.4 2.3GHz Core i7 (A1286) - Early 2011 (MD035LL/A) - ( Identifiers: MacBookPro8,2) Apple Macbook Pro 15.4 inch Late 2011 Version: - MacBook Pro 15.4 2.2GHz Core i7 (A1286) - Late 2011 (MD318LL/A) - MacBook Pro 15.4 2.4GHz Core i7 (A1286) - Late 2011 (MD322LL/A) - MacBook Pro 15.4 2.5GHz Core i7 (A1286) - Late 2011 (BTO/CTO) - ( Identifiers: MacBookPro8,2) Apple Macbook Pro 15.4 inch Mid 2012 Version: - MacBook Pro 15.4 2.3GHz Core i7 (A1286) - Mid 2012 (MD103LL/A) - MacBook Pro 15.4 2.6GHz Core i7 (A1286) - Mid 2012 (MD104LL/A) - MacBook Pro 15.4 2.7GHz Core i7 (A1286) - Mid 2012 (BTO/CTO) - ( Identifiers: MacBookPro9,1) Compatible Part Numbers: - A1382 - 661-5844 - 020-7134-A