This is a high-performance replacement digital battery for the Canon HFM50, guaranteed to meet or exceed the OEM specifications of your original. The digital battery is 1.57 x 1.19 x 0.61 inches with an output of 3.6 volts. The chemistry is LI-ION at 890mAH capacity. Manufactured by Empire Scientific, model number BLI-432. 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.