This is a high-performance replacement laptop battery for the HP/Compaq Business Notebook NX9040-PK425PA, guaranteed to meet or exceed the OEM specifications of your original. The laptop battery is 5.3 x 3.74 x 0.86 inches with an output of 14.8 volts. The chemistry is Li-Ion at 4400mAH capacity. Manufactured by Empire Scientific, model number LTLI-9004-4.4. 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.