FENIX ARB-L21 4000P High Draw 21700 LI-ION Rechargeable Battery

The Fenix ARB-L21-4000P is a High Capacity / High Draw 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.

This 4000P battery allows a high output flashlight like the LR35R to have its turbo setting of 10000 lumens to maintain it’s output by maintaining higher voltage for longer periods of a batteries charge.


In stock


  • Button-Top Design
  • Protective circuit inside the anode
  • Multiple protection
  • Over-charge protection
  • Over-discharge protection
  • Overheating protection
  • Short-circuit protection
  • Charging Current 1A Recommended, 4A Maximum
  • Max Output Current – 18A
  • Max Continuous Current – 10A
  • 500 charging circles


  • 12 months from date of purchase


Please Note: This battery is NOT an 18650 battery and it is not compatible with 18650 battery powered lights


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