This is a high-performance replacement two-way battery for the Yaesu/Vertex VX921, guaranteed to meet or exceed the OEM specifications of your original. The two-way battery is 2.35 x 1.07 x 3.54 inches with an output of 7.4 volts. The chemistry is Li-Ion at 3000mAH capacity. Manufactured by Empire Scientific, model number BLI-FNB92. 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.