Puredick New Laptop Battery for Apple Macbook pro 17-Inch series A1189 A1151 - 12 Months Warranty [Li-Polymer 10.8V 6600mAh] Battery type: Li-Polymer; Capacity: 6600mAh; Cells: 9-cell; Voltage: 10.8V. 100% New from Manufacturer. Up to 500 recharge cycles over the life of the battery.100% New from Manufacturer. 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. CE-/FCC-/RoHS certificated for safety,12 months warranty,professional technical support, efficient and always satisfied customer service 24 x 7 email support. Operation time:Same Battery life with Brand new original Apple battery.In reality, this will depend on the amount of electricity required by the device and how you use it.