This is a high-performance replacement laptop battery for the Texas Instruments Instrument 450, guaranteed to meet or exceed the OEM specifications of your original. The laptop battery is 8.46 x 2.06 x 0.73 inches with an output of 10.8 volts. The chemistry is NiMH at 4000mAH capacity. Manufactured by Empire Scientific, model number LTNM-9059-4.0. 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.