This is a high-performance replacement laptop battery for the Toshiba Satellite Pro L550-13D, guaranteed to meet or exceed the OEM specifications of your original. The laptop battery is 10.85 x 2.04 x 1.56 inches with an output of 10.8 volts. The chemistry is Li-Ion at 6600mAH capacity. Manufactured by Empire Scientific, model number LTLI-9139-6.6. 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.