SLODA Performance Battery for Apple Macbook Pro 13 inch A1278 A1322 [2009 2010 2011 Version] Battery 020-6547-A 661-5229 661-5557 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: 5500mAh/60Wh; Cells: 6-cell; Voltage: 10.95V. Operation time for standard batteries(6-cell, 5600mah): 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.