Key Power&reg; New Laptop Battery for Apple A1278 A1280 Macbook 13-Inch Series, Aluminum Unibody MB466LLA / MB466LL/A (Late 2008 Aluminum Version) - 18 Months Warranty [Li-Polymer 6-cell 5000mAh / 54Wh] Battery type: Li-Polymer; Capacity: 5000mAh/54Wh; Cells: 6-cell; Voltage: 10.8V. 100% New from Manufacturer. Up to 500 recharge cycles over the life of the battery. CE-/FCC-/RoHS-Certified for safety. 8-hr x 5-weekday call support, 18-month hassle-free warranty. Operation time for standard batteries(6-cell, 4000mah): Around 2.5 hours, the actual operation time will depend on how much electricity is required by the device and how you use it. Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability.