This is a high-performance replacement video battery for the Canon ES-4000, guaranteed to meet or exceed the OEM specifications of your original. The video battery is 2.8 x 1.52 x 2.37 inches with an output of 7.2 volts. The chemistry is Li-Ion at 6600mAH capacity. Manufactured by Empire Scientific, model number BLI-161-4.4. 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.