Li-Ion USB Rechargeable Battery Pack with Integrated Charge PortThe SL-B50protected Li-Ion rechargeable battery pack is designed for select Streamlight products. The battery features a built in USB-C port and charge indicator.Use the SL-B50battery pack to power theProTac2.0, ProTac2.0 Headlamp, and the ProTac2.0 Rail Mount3.6V, 4900mAh, rechargeable at least 500 timesCharges in 6 hours using USB-C inputBattery charge status indicators around the port: Red for charging, green for chargedIntegrated safety circuit protects batteries from overcharge/overdischarge3.26 in (8.28 cm); 3.0 oz (85.0 g)WARNING: Cancer and Reproductive Harm -www.P65Warnings.ca.gov