The Streamlight SL-B26 Rechargeable Battery is the battery pack that transforms their high-performance, multi-fuel lighting tools into rechargeable systems. FeaturesSL-B26 protected Li-Ion rechargeable battery pack with built in micro-USB charge portCharges in 5 hoursIntegrated safety circuit protects battery pack from overcharge/overdischarge2.75 in (7.0 cm); 1.7 oz (48g) 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