This is a high-performance replacement digital battery for the Canon EOS 5D MARKIII, guaranteed to meet or exceed the OEM specifications of your original. The digital battery is 2.2 x 1.51 x 0.82 inches with an output of 7.2 volts. The chemistry is Li-Ion at 1800mAH capacity. Manufactured by Empire Scientific, model number BLI-357. 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.