The battery pack that transforms our high-performance multi-fuel lighting tools into rechargeable systems. - Battery Pack Features: - SL-B26� protected Li-Ion rechargeable battery pack with built in micro-USB charge port - Charges in 5 hours - Integrated safety circuit protects battery pack from overcharge/overdischarge - 2.75 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