This is a high-performance replacement laptop battery for the Apple MacBook Pro 15Gǥ Aluminum Unibody (2008 Version), guaranteed to meet or exceed the OEM specifications of your original. The laptop battery is 9.81 x 3.07 x 0.43 inches with an output of 10.8 volts. The chemistry is LI-POL at 4600mAH capacity. Manufactured by Empire Scientific, model number LTLP-9163-4.6. We offer a 1 Year Warranty with purchase. See this product elsewhere at a lower price? Call or email us; we have a Price Match Guarantee.