This is a high-performance replacement tablet battery for the WACOM PTH-850-IT, guaranteed to meet or exceed the OEM specifications of your original. The tablet battery is 2.15 x 1.33 x 0.218 inches with an output of 3.7 volts. The chemistry is LI-POL at 1050mAH capacity. Manufactured by Empire Scientific, model number TLP-015. 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.