This is a high-performance replacement digital battery for the Panasonic VW-VBY100, guaranteed to meet or exceed the OEM specifications of your original. The digital battery is 1.7 x 1.2 x 0.57 inches with an output of 3.6 volts. The chemistry is LI-ION at 850mAH capacity. Manufactured by Empire Scientific, model number BLI-449. 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.