Connectbuying&reg;New Replacment 73WH A1321 Battery For Apple MacBook Pro Unibody 15 Battery type: Li-ion; Capacity: 6800mAh; Cells: 6-cell; Voltage: 10.95V. Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. 100% New from Manufacturer. Up to 500 recharge cycles over the life of the battery. Operation time for standard batteries(6-cell, 6800mah): Around 3 hours, the actual operation time will depend on how much electricity is required by the device and how you use it. Package included: 1 x Battery for A1321; 3 x Free Screwdrivers