Fenix ARB-L18-4000U High-Capacity USB Rechargeable 18650 Battery — 4000mAh

Power that refuses to ghost you after sunset. The Fenix ARB-L18-4000U is a 4000mAh high-capacity 18650 with a built-in USB-C charging port—so bright nights stay bright without hunting for dead adapters.

For anyone who treats a flashlight like a lifeline, this battery keeps the beam blazing when the trail goes quiet and your coffee goes cold. AXG Life. "Life, Adventure-Ready" gear you can trust when the map says maybe.

Key Features & Design

• High-capacity 4000mAh battery designed to keep runtimes strong between charges.
• Built-in USB-C charging port for convenient top-ups with just a cable (no external charger needed).
• Short-circuit prevention and multiple protective layers for safe operation.
• Button-top design that works with a broad range of Fenix LED flashlights.
• Packaged and priced as one battery.
• Note: This battery is slightly larger than a normal 18650 battery. See specifications for a detailed list of compatible products.
• Shipping note: Lithium-ion batteries are considered dangerous goods and are typically shipped by ground; orders containing loose batteries may take longer (14+ days is common).

Performance / Benefits

When the night bites, this battery keeps you powered. Long runtimes mean fewer swaps and fewer excuses. The built-in USB-C port makes top-ups painless, so you can focus on the trail, the map, or the campfire stories that will someday be legend. It’s built for midnight trail runs and questionable decisions—the kind of reliability that turns those weekend detours into hero stories. AXG Life, Life, Adventure-Ready through and through.

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