Dtk New Laptop Battery for Apple A1280 A1278 MacBook 13-inch Series, (2008 Version) [Li-Polymer 6-Cell 4200mah] Battery type: Li-ion; Capacity: 4200mAh; Cells: 6-cell; Voltage: 10.8V. 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. 24 x 7 email support, 12-month hassle-free warranty. Operation time for standard batteries(6-cell, 4200mah): Around 2 hours, the actual operation time will depend on how much electricity is required by the device and how you use it.