Egoway New Laptop Battery for Apple A1281 A1286 Macbook Pro 15" Aluminum Unibody (2008 Version) - 12 Months Warranty [Li-Polymer 6-cell 5000mAh] Battery type: rechargable Li-Polymer battery; 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. Operation time for standard batteries(eg, 4400mah): Around 2 hours, the actual operation time will depend on how much electricity is required by the device and how you use it. Warranty: 1 year warranty, 30 days money return guarantee, 24 x 7 email support.