This is a high-performance replacement video battery for the Pentax OPTIO A40, guaranteed to meet or exceed the OEM specifications of your original. The video battery is 1.39 x 1.6 x 0.25 inches with an output of 3.7 volts. The chemistry is Li-Ion at 1000mAH capacity. Manufactured by Empire Scientific, model number BLI-333. 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.