Batterytec&reg; Laptop Battery for Apple A1281 A1286 MB772 MB772LL/A Macbook Pro 15" Aluminum Unibody(2008 Version). [Li-polymer 6-cell 11.1V 5200mAh,1 year warranty] Battery Type: Li-Polymer, Cells: 6-cell,Capacity: 5200mAh; Voltage: 11.1V. 100% New Manufacturer. To 500 charging cycles during the lifetime of the battery. CE-/FCC-/RoHS-Certified for safety. 24 x 7 email support, 12 months warranty without problems. Class A cells provide fast loads and low power consumption, chip protection offers both security and stability.