Anker Replacement Battery for Apple 13in MacBook Pro [A1278] (11.1V, 6000mAh) 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. Battery type: Li-Polymer; Capacity: 5800mAh/64Wh; Cells: 6-cell; Voltage: 11.1V. Operation time for standard batteries(6-cell, 4400mah): Around 2 hours, the actual operation time will depend on how much electricity is required by the device and how you use it. CE-/FCC-/RoHS-Certified for safety. 24 x 7 email support, 8-hr x 5-weekday call support, 18-month hassle-free warranty.