Puredick New Laptop Battery for Apple A1382 A1286 (only for Core i7 Early 2011 Late 2011 Mid 2012) Unibody Macbook Pro 15" i7, also fit 661-5476 661-5211+Two Free Screwdrivers - 18 Months Warranty [Li-Polymer 6-cell 77.5Wh] Battery type: Li-Polymer; Capacity: 77.5Wh; Cells: 6-cell; Voltage: 10.95V 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,18 months warranty,professional technical support, efficient and always satisfied customer service 24 x 7 email support. Operation time:Same Battery life with original Brand new Apple battery. In reality, this will depend on the amount of electricity required by the device and how you use it