This is a high-performance replacement digital battery for the Panasonic DMC-643, guaranteed to meet or exceed the OEM specifications of your original. The digital battery is 2.23 x 1.55 x 0.82 inches with an output of 7.2 volts. The chemistry is LI-ION at 1550mAH capacity. Manufactured by Empire Scientific, model number BLI-440. 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.