This is a high-performance replacement flashlight battery for the Streamlight SL-20L, guaranteed to meet or exceed the OEM specifications of your original. The flashlight battery is 7.27 x 1.35 x 1.35 inches with an output of 6 volts. The chemistry is NIMH at 2400mAH capacity. Manufactured by Empire Scientific, model number FLB-NMH-2. 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.