Fenix ARB-L21-4000P Rechargeable Battery 21700 4000 mAh - High Power 10A

Overview

The Fenix ARB-L21-4000P rechargeable battery is a Li-ion cell in the 21700 format, specially developed to power high-performance Fenix flashlights. Thanks to its 4000 mAh capacity and stable nominal voltage, it allows your light to maintain high illumination levels for longer, including in turbo mode. Whether you're a security professional, rescue worker, or outdoor enthusiast, this battery is the reliable power source that modern lights such as the LR35R require.

Technical Specifications

• Capacity: 4000 mAh (14.4 Wh) for extended runtime, even at high power
• Nominal voltage: 3.6 V, maintained longer for consistent performance
• Continuous output current: up to 10A, with peaks of 18A (less than 3 minutes) for the most demanding turbo modes
• Dimensions: 76 mm height x 21.5 mm diameter, 21700 format
• Weight: only 70 g
• Lifespan: designed for approximately 500 charge cycles
• Charging: recommended current 1A, maximum 4A

Advantages

• Complete safety: triple overheating protection (pressure relief vents, microporous protection, PTC cathode block) and anode protection circuit against short circuits, overcharging, and excessive discharge
• Impact resistance thanks to its steel cylinder protecting the cell from external impacts
• Optimal performance with high-power lights: it maintains high voltage for extended turbo modes, such as the 10,000 lumens of the LR35R
• Extended compatibility with Fenix LR35R, PD36R, PD40R, TK22 V2.0, TK22UE, and E35 V3.0 flashlights
• Rechargeable with Fenix ARE-A2, ARE-A4, ARE-D1, and ARE-D2 chargers
• Economical and sustainable solution: 500 charge cycles replace hundreds of disposable batteries

Use and Maintenance

Only recharge the battery with a charger suitable for the 21700 format and never leave it in the charger for more than 24 hours. Charge under supervision and never mix this battery with cells of other brands or types. Warning: this battery is not compatible with lights designed for the 18650 format nor with older generation chargers. Sold individually, it is covered by a 12-month warranty from the date of purchase.