This is a high-performance replacement cellular battery for the HTC X720D, guaranteed to meet or exceed the OEM specifications of your original. The cellular battery is 2.38 x 2.15 x 0.187 inches with an output of 3.7 volts. The chemistry is LI-POL at 2000mAH capacity. Manufactured by Empire Scientific, model number BLP-1284-2. 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.