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The Fenix ARB-L21-6000B is a rechargeable 21700-format Li-ion battery with a 6000 mAh capacity, representing the highest real capacity available on the market in this category. Thanks to the integrated USB-C connector and power bank function, it is an exceptionally versatile power source for demanding torch users and portable electronics.

The battery features a multi-layer safety system that combines electronic protection with internal mechanical elements such as a separator, an HRL thermal layer and an anti-explosion valve. The result is one of the safest Li-ion batteries available on the market, suitable for everyday professional and outdoor use.

1. Charging and power bank function in a single cell
   The battery can be charged directly via the side USB-C connector from a computer, power bank or standard mobile charger, and it can also be used the other way round – as a power bank for charging other USB devices, while three indicator LEDs around the positive terminal continuously inform you of the current charge level in both modes.
2. Top-level safety thanks to combined protection
   Electronic protection prevents overcharging, deep discharge, short circuit and excessive current draw above 10 A, while internal mechanical protection via the heat-resistant HRL layer and anti-explosion valve ensures safe pressure relief and interruption of the exothermic reaction in extreme situations – meaning the battery meets even the strictest safety requirements.

• 6000 mAh capacity – the highest on the market
• Integrated side USB-C connector
• Power bank function for USB devices
• Three LEDs indicate charge status
• Protection against overcharge, over-discharge and short circuit
• Internal HRL protection and anti-explosion valve
• Maximum discharge current 10 A
• Lifespan of more than 500 charge cycles
• Dimensions 22 × 77 mm (larger diameter than standard)
• Compatible with selected Fenix torches
• No memory effect and no self-discharge
• Charging also possible in standard Li-ion chargers

Specifications:

Nominal voltage: 3.6 V
Capacity: 6000 mAh (tested at 0.2 C, cut-off at 2.5 V, 25 °C)
Maximum current draw: 10 A
Recommended charging current: 1.2 A
Maximum charging current: 3 A
Dimensions: 22 mm (diameter) × 77 mm (length)
Weight: 80 g
Operating temperature – charging: 0 to +45 °C
Operating temperature – discharging: −20 to +60 °C
Lifespan: more than 500 cycles
Compatible Fenix torches: TK17, TK22R, TK30R, HT18R, HT32, LR36R, LD45R, PD40R V3.0, PD36R V2.0, PD45R ACE, WF25RM
Compatible chargers: ARE-D1, ARE-D2, VC4SL, VC8S