Runpower New Laptop Battery for Apple A1281 A1286 (2008 Version) MacBook Pro 15" Aluminum Unibody [Li-Polymer] Battery type: Li-Polymer; Capacity: 54Wh/5000mAh; Cells: 6-cell; Voltage: 10.8V Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability Worry-free, products are passed CE-/FCC-/RoHS-Certified for safety; 100% New from Manufacturer. Up to 500 recharge cycles over the life of the battery Battery operation time: approximately 2.5 hour. Actual operation time will depend on how much electricity is required by the device and how you use it Warranty: 12 months free warranty. 24 x 7 professional and efficient email support