CWK High Performance New Battery for Apple A1280, A1278, MB771LL/A,MB466/A 13-inch Macbook Rechargeable Battery (Aluminum Unibody) MacBook 13 inch Aluminum Unibody (2008 Version) 24 Months Warranty Condition: Brand New - Grade A cells Battery Type: Li-ion Voltage: 10.8 Volt (11.1 Volt compatible) Capacity: 5200mAh (Better than 4400mAh) 90 Day Money Back. Buy with confidence!