This is a high-performance replacement flashlight battery for the Streamlight 20X1701, guaranteed to meet or exceed the OEM specifications of your original. The flashlight has a 4400mAH capacity. Manufactured by Empire Scientific, model number FLB-NMH-4. 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.