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Fenix ARB-L21-4000P Rechargeable Battery

$38.00 $25.95

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ARB-L21-4000P is a high-capacity 21700 Li-ion rechargeable battery built for longer runtimes at higher levels. These 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. Additional features include a protection circuit in the anode to help prevent short circuits, over charge/discharge and over heating. Pressure relief vents which expel waste gas in the rare case of an internal short circuit preventing an explosion. Battery capacity up to 4000mAh. 500 charging cycles. Important Note: THIS BATTERY IS NOT COMPATIBLE WITH 18650 FLASHLIGHTS OR OLDER STYLE CHARGERS. COMPATIBLE CHARGERS ARE THE ARE-A2, ARE-A4, ARE-D1 OR ARE-D2.

SKU: ARB-L21-4000PN/ABarcode: 6942870307220N/A

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More Information

Specifications of the ARB-L21-4000P Rechargeable Battery

  • 21700 battery type
  • 4000mAh high capacity
  • Protection circuitry to prevent short circuits
  • Pressure vents to prevent explosions
  • 500 charge cycles
  • Compatible with Fenix lights that require a 21700 type battery like the HT18, LR35R, PD36R, PD40R V2.0, TK22 UE, and TK30.

Capacity: 4000mAh
Voltage: 3.6V
Charging Current: Recommended 1A, maximum 4A
Maximum output current: 18A (less than 3 minutes)
Maximum continuous output current: 10A
Weight: 2.5 ounces (70g)
Size: Length: 2.99″ (76mm) Diameter: 0.85″ (21.5mm)
Warranty Period: 12 month from date of purchase

Customer Reviews

Based on 4 reviews
stephen coppess

High AMP

Richard S.

Great back up power.


Is this a AA battery?


What is the difference between this and the arb-l21-5000?

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