This is a high-performance replacement video battery for the Sony CCDTRV57, guaranteed to meet or exceed the OEM specifications of your original. The video battery is 2.8 x 1.51 x 2.31 inches with an output of 7.2 volts. The chemistry is Li-Ion at 5500mAH capacity. Manufactured by Empire Scientific, model number BLI-153-4.8C. 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.