This is a high-performance replacement laptop battery for the Tatung TNB5500, guaranteed to meet or exceed the OEM specifications of your original. The laptop battery is 5.85 x 3.5 x 0.78 inches with an output of 12 volts. The chemistry is NiMH at 4000mAH capacity. Manufactured by Empire Scientific, model number LTNM-9052-4.0. 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.