The Fenix ARB‑L21‑5000U is a high-capacity 21700 rechargeable Li‑ion battery delivering 5,000 mAh of reliable power for high-drain flashlights and gear. Equipped with a built-in USB‑C charging port, you can recharge it quickly with common USB‑C cables—no separate charger required. Ideal for extended runtime and convenience.
Safety is front and center: it features comprehensive protection circuitry (overcharge, over-discharge, short-circuit, and overheat protection), as well as pressure relief vents for safe energy release. The button-top design ensures compatibility with a wide range of devices. Rated for 500 charge cycles, it maintains dependable performance over time.
Key Specifications:
- 5000mAh Capacity
- USB Type-C Charging
- 500 Charging Cycles
- Protection Circuits in Anode
- Overcharge Protection
- Over-discharge protection
- Short Circuit Protection
- Overheat protection
- 3 sets of overheat protection
- Pressure relief valve
- Microporous PTC Cathodal Block
- 3.6V USB Charging - USB-A to USB-C Cable
- Single Port Charger
- 1 Amp/2 Amp at 10 Watts Max
- Maximum Output Current 8A
- Weight: 2.56 oz / 72.5g
- 2.99" Height
- 0.85" Diameter
A robust and convenient power solution—perfect for tactical flashlights, headlamps, outdoor gear, and emergency devices.
