Key Power New Laptop Replacement Battery for [Apple MacBook Pro 15 inch] - A1321 A1286 (Mid 2009 Mid 2010 Version) with 18 Months Warranty [7200mAh/78Wh] Battery type: Li-Polymer; Capacity: 7200mAh/ 78Wh; Cells: 6-cell; Voltage: 10.95V. 100% New from Key Power. Up to 500 recharge cycles over the life of the battery. Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. Worry-free, products are passed CE-/FCC-/RoHS-Certified for safety. Battery operation time: approximately 2 hour 15 minutes. Actual operation time will depend on how much electricity is required by the device and how you use it.