CSE New Laptop Battery for Apple Macbook pro 17-Inch series A1189 A1151 Aluminum Body - 12 Months Warranty [Li-Polymer 9-cell 6600mAh] Battery type: Li-Polymer; Capacity: 6600mAh/71Wh; Cells: 9-cell; Voltage: 10.8V. 100% New from Manufacturer. Up to 500 recharge cycles over the life of the battery. CE-/FCC-/RoHS-Certified for safety. 24 x 7 email support, 8-hr x 5-weekday call support, 12-month hassle-free warranty Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. Operation time: the actual operation time will depend on how much electricity is required by the device and how you use it.