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Fenix ARB-L21-5000 Li-ion Rechargeable 21700 Battery

2 reviews


The Fenix ARB-L21-5000 is a high capacity 21700 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.


  • Button-Top Design
  • Protective circuit inside the anode
  • Multiple protection
    • Over-charge protection
    • Over-discharge protection
    • Overheating protection
  • Short-circuit protection
  • 500 charging circles

To prevent any mistake, please note that this battery is not a 18650 battery and it is not compatible with 18650 battery powered lights (unless your device is compatible with both - if it is, it will be mentioned). Thank you!


Customer Reviews
5.0 Based on 2 Reviews
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Li rechargeable 21700 battery

Great,good power,great battery life

Paul S.

Very good quality, holds the charge well and delivers the specs it lists!

Dean N.