Fenix High Discharge 21700 4000 mAh Li-ion Protected Battery (ARB-L21-4000P)
Fenix High Discharge 21700 4000 mAh Li-ion Protected Battery (ARB-L21-4000P)Fenix High Discharge 21700 4000 mAh Li-ion Protected Battery (ARB-L21-4000P)Fenix High Discharge 21700 4000 mAh Li-ion Protected Battery (ARB-L21-4000P)
Fenix High Discharge 21700 4000 mAh Li-ion Protected Battery (ARB-L21-4000P)Fenix High Discharge 21700 4000 mAh Li-ion Protected Battery (ARB-L21-4000P)Fenix High Discharge 21700 4000 mAh Li-ion Protected Battery (ARB-L21-4000P)

Fenix High Discharge 21700 4000 mAh Li-ion Protected Battery (ARB-L21-4000P)

Brand:  Fenix
Product Code:  ARB-L21-4000P

Availability:  

7 in stock
£27.95

Due to shipping regulations this battery can only be shipped to the Mainland UK, unless it is sent with a compatible torch or battery charger. Any orders to outside of the Mainland UK (including NI, Scottish Highlands, Channel Islands etc.) for this battery without compatible equipment will be cancelled. If you require advice prior to purchase please contact us

We are unable to accept the return of opened batteries, therefore please ensure they are the correct cell for your device before ordering.


The Fenix ARB-L21-4000P is a premium quality high capacity 21700, 4000 mAh lithium-ion battery with a continuous output current of 10 A, specifically designed for high intensity use in torches such as the Fenix LR35R.

Please note: This battery is larger than an 18650 battery and cannot be used in standard 18650 sized torches.

Product Features

10 A continuous discharge current, 18 A maximum
High capacity (4000 mAh), great reliability and compact design
Recommended 1 A charging current, 4 A maximum
Protection circuit built into positive terminal for outstanding damage resistance
Triple overheat protection for safety and reliability
Built-in overcharge and over discharge protection
Unique structural design for better impact resistance
Button top positive contact for greater versatility

Battery Charger Information:
You will need to purchase a suitable battery charger if you do not have one, please see the related products. This battery not compatible with the X and C series of Fenix chargers, but can be used with the ARE-A4 and ARE-D2.


Pack Information
Batteries per Pack: 1
Weight: 70 grams per battery
Details for Fenix ARB-L21-4000P 21700 Protected Li-ion Battery
Battery Technology: Lithium-ion (Rechargeable)
Diameter: 21.5 mm
Height: 76 mm
Voltage: 3.6 V
Capacity: 4000 mAh
Charging Current: Recommended 1 A, Maximum 4 A
Maximum Discharge Current: 10 A

Important Safety Information

Lithium-ion batteries should never be left charging unattended under any circumstances. The user must have knowledge of how to charge and discharge Li-ion batteries before using them - for more information please click here. Always use a charger that is designed to recharge the particular lithium-ion cell that you wish to recharge. Never use a DC adaptor to charge Li-ion batteries. We are NOT responsible for any damage that is caused by the misuse of lithium-ion batteries. We recommend charging any lithium-ion cell on a metal surface or other non-flammable surface.


Packaging and Contents

Supplied in retail pack and contains:
Fenix 21700 10 A 4000 mAh rechargeable lithium-ion protected battery x 1

Fenix LR35R Rechargeable LED Searchlight

Fenix LR35R Rechargeable LED Searchlight

Maximum 10000 lumens output

4 in stock

Two Fenix ARB-L21-4000P lithium-ion batteries included

The Fenix LR35R is a high performance rechargeable searchlight that delivers a maximum output of 10000 lumens and a beam range of 500 from 6 x Luminus SST-40 LEDs. It has a wide beam angle of 90° to easily light up the area around you to aid in searching large areas and increase efficiency.

[More details]
£199.95Add to Basket

Fenix ARE-D1 Single Bay Li-ion Battery Charger

Fenix ARE-D1 Single Bay Li-ion Battery Charger

Compatible with Li-ion & NiMH/Ni-Cd batteries
Features a power bank function for charging external devices

14 in stock

The Fenix ARE-D1 is a lithium-ion and NiMH smart multi charger with a single charging bay, and features a digital display and a power bank function.

[More details]
£15.95Add to Basket

Fenix ARE-D2 Dual Bay Li-ion Battery Charger

Fenix ARE-D2 Dual Bay Li-ion Battery Charger

Compatible with Li-ion & NiMH/Ni-Cd batteries
Features a power bank function for charging external devices

3 in stock

The Fenix ARE-D2 is a lithium-ion and NiMH smart multi charger with a two independent charging bays, and features a digital display and a power bank function.

[More details]
£28.95Add to Basket

Fenix ARE-A2 Dual Bay Li-ion/NiMH Battery Charger

Fenix ARE-A2 Dual Bay Li-ion/NiMH Battery Charger

Charges lithium-ion and NiMH/NiCd type batteries.

8 in stock

The Fenix ARE-A2 is the replacement for the best selling ARE-C1+ and has now been upgraded to be able to charge 21700 lithium-ion batteries as well as the same batteries as before. It features two independent charging channels capable of charging a range of lithium-ion and NiMH/NiCd batteries.

[More details]
£27.95Add to Basket

Fenix ARE-A4 Four Bay Li-ion/NiMH Battery Charger

Fenix ARE-A4 Four Bay Li-ion/NiMH Battery Charger

Charges lithium-ion and NiMH/NiCd type batteries.

12 in stock

The Fenix ARE-A4 is the replacement for the best selling ARE-C2+ and has now been upgraded to be able to charge 21700 lithium-ion batteries as well as the same batteries as before. It features four independent charging channels capable of charging a range of lithium-ion and NiMH/NiCd batteries.

[More details]
£39.95Add to Basket

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We have been an authorised Fenix stockist since 2009

Fenix is a leading outdoor sport lighting brand as well as a national high-tech enterprise which specializes in R&D, manufacturing and selling of outdoor sport lighting tools, including mid/high-end LED torches, headlamps, bike lights and camping lanterns, as well as accessories. The Fenix brand has successfully entered the major outdoor and military markets. 'Stay true to the mission, to the original dream', is the best interpretation of the brand name Fenix, which means perfect thing, and they do this with unyielding pursuit.


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