This is a high-performance replacement digital battery for the Nikon COOLPIX S3100, guaranteed to meet or exceed the OEM specifications of your original. The digital battery is 1.57 x 1.23 x 0.24 inches with an output of 3.7 volts. The chemistry is Li-Ion at 650mAH capacity. Manufactured by Empire Scientific, model number BLI-413. 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.