Go to Amazon Sites : br br TPE? New Laptop Battery for Apple A1281 A1286 Macbook Pro 15 Aluminum Unibody (2008 Version) br br Battery type rechargable Li-ion Battery Capacity 5200mAh56Wh Cells 6-cell Rating 108V br About 500 recharge cycles over the life of the battery br Grade A cells ensure fast charges and low power consumption Built-in circuit protection ensures both safety and stability br 100 New from Manufacturer12 months warranty br Operation time for standard batterieseg 4400mah Around 2 hours the actual operation time will depend on how much electricity is required by the device and how you use it