Streamlight’s battery pack that transforms our high-performance, multi-fuel lighting tools into rechargeable systems. Charges in 5 hours. Integrated safety circuit protects battery pack from overcharge/overdischarge. Use the SL-B26 USB battery to power the PolyTac X USB, PolyTac 90 X USB, ProTac 90 X USB, ProTac 2L-X USB, ProTac HL-X USB, ProTac HL 5-X USB, Siege X USB, Stinger 2020, Survivor X USB, Vantage 180 X USB, and more to transform these multi-fuel lighting tools into rechargeable systems