The Fenix ARB-L21-4000P is a new type of Fenix Li-ion 21700 battery, offering increased power.

With a maximum output current of 18A and a continuous output current of 10A, the power of the 21700 battery is twice that of a standard 18650/2300 mAh battery. This means it can be used for longer before needing to be recharged.

Multiple protection ensures safe use and good battery performance. Steel shell riveting technology protects the battery from damage and possible decompression.

Technical features

  • Dimensions: 71 x 21.5 mm
  • Weight: 70g
  • Improved power.
  • 4000mAh high capacity.
  • 500 charge cycles.
  • Integrated protection circuits.