21700 Fenix ARB-L21-5000U USB Type-C Battery

Product Overview

The Fenix ARB-L21-5000U is a 21700 form-factor lithium-ion battery with a large capacity of 5000 mAh, designed for use in flashlights and other standalone devices. Manufacturer: Fenix. Product Category: Power > Rechargeable Batteries.

Convenient Charging and Indication

The main feature of this model is its built-in Type-C (USB-C) charging port, which allows the battery to be connected to standard USB chargers, power banks, solar panels, or charged directly in a flashlight with a built-in charger. When charging via the Type-C port, indication is provided by LEDs on the end: a red LED illuminates during charging, and a green one lights up when the process is complete.

Reliability and Protection

The battery is equipped with a protective circuit board that guards against overcharge, over-discharge, short circuit, and overheating, enhancing safety and extending lifespan. The protection board is integrated into the anode and shielded by a steel plate. The battery casing features a steel shell for additional protection. The top of the casing includes two vents for releasing excess gas pressure, reducing the risk of swelling or explosion. The estimated lifespan is approximately 500 cycles of charging/discharging; even after about 550 full cycles, the battery can retain up to 75% of its initial capacity with proper use.

Technical Specifications

• Size: 21700

• Capacity: 5000mAh

• Nominal Power: 18 Watt-hours (18Wh)

• Nominal Voltage: 3.6 Volts

• Maximum Voltage: 4.2 Volts

• Max Discharge Current: 8 Amperes

• Recommended Charging Current: 1 Ampere

• Max Charging Current: 5 Amperes

• Recommended Charging Current via USB Port: 2 Amperes

• Dimensions: 21.5×76 millimeters

• Weight: 72.5 grams

This model combines high capacity, built-in USB Type-C charging, and protective elements, making it convenient and safe for daily use in flashlights, portable devices, and emergency kits. If you need a reliable battery from a reputable brand, the Fenix ARB-L21-5000U is an excellent choice.

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