Egoway New Laptop Battery for Apple A1280 A1278 (2008 Version) Macbook 13-Inch Series, Aluminum Unibody - 18 Months Warranty [Li-Polymer 6-cell 5000mAh] Battery Type: Li-Polymer; Voltage:10.8V; Capacity: 5000mAh; 6 Cell. Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. About 500 recharge cycles over the life of the battery. Overcharger and Discharger Circuit Protection, CE-/FCC-/RoHS-Certified for safety Operation time for standard batteries(eg, 4000mah): Around 2 hours, the actual operation time will depend on how much electricity is required by the device and how you use it. Warranty: 18 Months warranty, 30 days money return guarantee, 24 x 7 email support.