This is a high-performance replacement cordless battery for the Siemens V30145-K1310K-X444, guaranteed to meet or exceed the OEM specifications of your original. The cordless battery is 2.06 x 1.38 x 0.175 inches with an output of 3.7 volts. The chemistry is Li-Ion at 830mAH capacity. Manufactured by Empire Scientific, model number CPL-536. 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.