The Fenix ARB-L21-5000U rechargeable battery elevates runtime for professional flashlights by pairing 5 000 mAh capacity with built-in USB-C charging. Perfect for military operations, law enforcement and airsoft enthusiasts, it delivers steady power and fast top-ups anywhere, without external chargers.

Technical Specifications

Cell type: 21700 Li-Ion with button-top positive

Capacity: 5 000 mAh

Nominal voltage: 3.6 V

Lifecycle: up to 500 cycles maintaining at least 70 % capacity

Built-in recharge port: USB-C up to 1 A

Internal protections: overcharge, overdischarge, short-circuit, overheating

Pressure relief vents for safe gas release

Dimensions: 76 mm (length) × 21.5 mm (diameter)

Weight: 72.5 g

Finish: shock-resistant, corrosion-proof coating

EAN: 6942870306933

Package Contents

1 × Fenix ARB-L21-5000U battery

This cell lets you extend intensive missions, recharge on the go with a simple USB-C cable and always rely on consistent performance.

End-User Benefits
Integrated USB-C charging removes the need for external chargers, delivers quick recharge times and gives you full control over cycle management. High capacity ensures extra hours of operation even with high-output lights, minimizing downtime during critical tasks.

Warnings & Safety Information (GSPR Compliant)

Keep out of reach of children

Store in a cool, dry place away from heat and moisture

Do not tamper with the built-in protection circuit

Before charging, ensure the USB-C port is clean and dry

Wipe exterior with a lightly damp microfiber cloth; avoid solvents or abrasives

Do not disassemble or modify the battery: alterations compromise safety

No age restriction for purchase or use