The Fenix ARB-L18-3400 is a high capacity 18650  Li-ion  rechargeable
battery with a protection circuit in the anode to help prevent short circuits,
over charge/discharge and over heating. The battery also includes pressure
relief vents which expel  waste gas  in  the  rare  case  of  an  internal  short
circuit preventing an explosion.

FEATURES:

• ARB-L18-3400 Rechargeable Battery
• 3400mAh high capacity
• Protection circuitry to prevent short circuits
• Pressure vents to prevent explosions
• 500 charge cycles

SPECS:

• Voltage: 3.6V
• Charging Current:
  Recommended 1A,
  maximum 2A
• Weight: 1.8 ounces (50g)
• Size:
  Length: 2.7″ (69mm)
  Diameter: 0.7″ (18.6mm)