This is a high-performance replacement video battery for the Canon BP-819, guaranteed to meet or exceed the OEM specifications of your original. The video battery is 1.58 x 1.2 x 1.54 inches with an output of 7.4 volts. The chemistry is Li-Ion at 1600mAH capacity. Manufactured by Empire Scientific, model number BLI-338-1.9. 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.