Features & Benefits:

• 18650 button top lithium ion battery with on-board safety control circuit
• Micro-USB input; charges in 5 hours
• Integrated safety circuit protects battery from overcharge and overdischarge
• 2.75 in (7.0 cm); 1.7 oz. (48 grams)
• Use the 18650 USB battery to power the PolyTac X, ProTac 2L-X, ProTac HL-X and ProTac HL5-X and transform these multi-fuel lighting tools into rechargeable systems

The battery that transforms multi-fuel, high performance lighting tools into rechargeable systems.  18650 button top lithium ion battery with on-board safety control circuit.  Micro-USB input - fully charges in 5 hours.