This is a high-performance replacement laptop battery for the Hp Pavilion dm3-1028TX, guaranteed to meet or exceed the OEM specifications of your original. The laptop battery is 7.68 x 3.62 x 0.58 inches with an output of 11.1 volts. The chemistry is LI-POL at 5400mAH capacity. Manufactured by Empire Scientific, model number LTLP-9155-5.4. 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.