This is a high-performance replacement laptop battery for the Toshiba Satellite L40-13S, guaranteed to meet or exceed the OEM specifications of your original. The laptop battery is 5.42 x 2.88 x 0.79 inches. Manufactured by Empire Scientific, model number LTLI-9127-4.4. 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.