The Fenix 21700 6000 mAh rechargeable battery (ARB-L21-6000B) with protective electronics (protected) and with its own USB-C charging connector delivers the highest real capacity on the market. Li-ion rechargeable batteries are characterized by a very high capacity, do not suffer from memory effect or self-discharge. It can be charged by connecting a cable to the USB-C connector (e.g. from a computer, power bank or mobile phone charger) or in a conventional Li-ion charger. At the same time, the battery can also be used as a power bank and charge other USB devices from it.

Attention, the dimensions of the battery are 22 millimeters by 77 millimeters, making it larger in diameter than the regular Li-ion type 21700. So it only fits some flashlights and headlamps. It is compatible with the following Fenix flashlights: TK17, TK22R, TK30R, HT18R, HT32, LR36R, LD45R, PD40R V3.0, PD36R V2.0, Fenix PD45R ACE, Fenix WF25RM.

The Fenix battery protection consists of internal safety mechanisms and protective electronics. Added electronic circuits prevent the cell from overcharging, over-discharging. They protect it against short circuit or too high current draw. If the battery electronics assess that the limits have been reached, they safely disconnect the cell.

Internal protection consists of a separator, state-of-the-art overheat protection (HRL - Heat Resistance Layer) and a special anti-blast valve. In the event that the gas pressure in the cell exceeds a certain limit, the internal separator separates the electrodes inside the battery and thus de-facto interrupts the exothermic reaction and the explosion-proof valve releases the excess gas pressure outside the battery. The combination of electronic and mechanical (temperature and pressure) protection makes Fenix batteries among the safest li-ion batteries available.

Due to the 77 millimeter length of the battery (including the protective electronics), it can only be charged in chargers that are designed for this length. See recommended chargers below.

Fenix 21700 6000 mAh USB-C Battery Specifications

• Nominal voltage : 3.6V
• Capacity : 6000 mAh, tested at 0.2 C discharge current with termination at 2.5 V and 25°C
• Maximum current draw : 10 A
• Recommended charging current: 1.2 A
• Maximum charging current: 3 A
• Three indicator LEDs provide information about the charge status
• Dimensions: 22 mm (diameter) x 77 mm (length)
• Weight 80 grams
• Compatible with Fenix flashlights: TK17, TK22R, TK30R, HT18R, HT32, LR36R, LD45R, PD40R V3.0, PD36R V2.0.
• Overcharge, full discharge and short circuit protection (>10 A). Protection circuit mounted on the plus pole.
• Lifetime of more than 500 charging cycles
• Recommended operating temperatures: 0-45°C (charging), -20 to +60°C (discharging)
• Package: one piece of USB-C battery Fenix 21700 6000mAh (ARB-L21-6000B).

Charging via USB-C connector

Plug the USB cable into the side USB-C connector, charging progress is indicated by three indicator LEDs around the plus pole:

• one flashes - charge level 0-33%
• one lit, one flashing - 33-66% charge level
• two lit, third flashing - charge level 66-99%
• three lights - fully charged to 100%

Powerbank features

Plug the USB cable into the side USB-C connector and plug the USB device to be charged into the other end of the cable. The remaining battery capacity in powerbank mode is indicated by three LEDs around the plus pole:

• all indicator LEDs are off - 0% of the battery is discharged
• one flashes - 1-5% charge level
• one is lit - charge level 5-33%
• two lit - 33-66% charge level
• three lit - 66-100%

Compatible chargers

Due to the 77 millimetre length of the battery (including the protective electronics), it can only be charged in chargers that are adapted to this length and are listed below. It will not fit other models.

USB charger Fenix ARE-D1
USB charger Fenix ARE-D2
Four channel USB charger VC4SL
8-channel USB charger VC8S

Warning

• Do not discharge the battery below 2.5V if possible
• Do not short-circuit the battery (do not connect the cell poles with a wire)
• Do not throw the battery into fire or water
• Do not insert the battery into the charger in reverse (opposite polarities)
• When using the battery, observe safety guidelines
• Use only an adequate charger that supports Li-ion batteries

Warranty

Warranty two years.