This is a high-performance replacement laptop battery for the Apple MacBook Pro 15 MB134LL/A, guaranteed to meet or exceed the OEM specifications of your original. The laptop battery is 5.45 x 4.43 x 0.56 inches with an output of 10.8 volts. The chemistry is Li-Pol at 5600mAH capacity. Manufactured by Empire Scientific, model number LTLP-9002-5.6. 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.