BRTONG A1382 Laptop Battery for Apple Macbook Pro 15" Inch A1286 (For Core i7 Early 2011 Late 2011 Mid 2012) - Fit as Original - 18 Months Warranty Compatible Model: Apple Macbook Pro 15" Inch A1286 (Early 2011, Late 2011, Mid 2012 Only), A1382 Only Compatible part number: MC721LL/A, MC723LL/A, MD035LL/A, MD318LL/A, MD322LL/A, MD103LL/A, MD104LL/A, BTO/CTO (see compatible models) Battery type: Li-Polymer; Capacity: 7200mAh/77.5Wh; Cells: 6-cell; Voltage: 10.95V Operation time for standard batteries: Around 3-5 hours, the actual operation time will depend on how much electricity is required by the device and how you use it CE-/FCC-/RoHS-Certified for safety. 24 x 7 email support, 18-month hassle-free warranty