Description
Experience ultimate charging convenience with the Fenix ARB-L18-3400U, a genuine 18650 battery featuring a built-in Micro-USB charging port. No external charger required — simply plug any Micro-USB cable directly into the battery to recharge from a USB wall adapter, power bank, car charger, or laptop. Built around a premium Panasonic NCR18650B 3400mAh cell core, it delivers long-lasting power with integrated overcharge, over-discharge, and short-circuit protection. The button top design ensures broad compatibility with Fenix flashlights and most other brands requiring a raised positive contact. Whether you are on a camping trip, traveling, or preparing for emergencies, the ARB-L18-3400U keeps you powered up wherever a USB port is available.
Key Features
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Built-in Micro-USB Charging Port – Recharge directly from any standard 5V USB power source. No external 18650 charger needed. Perfect for travel, camping, and on-the-go convenience.
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3400mAh High Capacity – Powered by a genuine Panasonic NCR18650B cell core, providing extended runtime for high-output LED flashlights, headlamps, and portable devices.
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Integrated Safety Protection – Built-in protection circuit guards against overcharge (4.2V), over-discharge (2.5V), short circuit, and overcurrent, ensuring safe and reliable operation.
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LED Charging Indicator – A convenient built-in LED glows red while charging and turns green when fully charged, so you know exactly when the battery is ready.
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Button Top Design – Features a raised positive terminal for compatibility with Fenix flashlights and other devices requiring a button top contact.
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Genuine Fenix Quality – Manufactured to rigorous standards with authentic Panasonic cell core and premium protection circuitry for long service life and consistent performance.
Parameters
Applications
Recommended For
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LED Flashlights & Tactical Torches: Perfect for Fenix lights and most other brands requiring a button top 18650. The 3400mAh capacity ensures long runtime, while USB charging allows convenient recharging anywhere.
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Headlamps for Camping & Outdoor Activities: No need to carry a bulky charger. Recharge from a power bank at camp or from a car USB port between hikes.
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Camping Lanterns & Emergency Lights: Simplify your gear list. Any USB power source becomes your charger.
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Portable Fans & Handheld Devices: Keep your cooling fans and gadgets running with easy USB recharging.
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Travel & EDC Kits: Minimize accessories. One USB cable charges your phone and your battery.
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Emergency Preparedness: In a power outage or disaster scenario, any available USB port can recharge this battery to keep your essential lights working.
Not Recommended For
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High-Power Vaping / Mechanical Mods: The built-in protection limits discharge current to approximately 5A. High-drain vaping devices require 15A+ unprotected cells.
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Cordless Power Tools: These demand 15–40A continuous current, far beyond this battery's protection limit.
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Devices with Tight Battery Compartments: This battery is approximately 70.2mm long (about 5mm longer than a standard unprotected 18650). Some compact flashlights may not close fully. Always verify your device can accommodate the extra length.
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Multi-Cell Series Packs: Individual protection boards may conflict when connected in series. Use matched unprotected cells with an external BMS instead.
FAQ
Q: How do I charge this battery?
A: Simply connect a standard Micro-USB cable to the charging port on the battery's positive end. Plug the USB-A end into any standard 5V USB power source such as a phone charger, power bank, laptop USB port, or car USB adapter. The built-in LED glows red during charging and turns green when fully charged. A full charge takes approximately 4–5 hours.
Q: Can I use this battery in any 18650 device?
A: It fits most devices that accept button top 18650 cells. However, due to the integrated USB charging port and protection circuit, this battery is approximately 70.2mm long — about 5mm longer than a standard unprotected 18650. Some compact flashlights with very tight battery compartments may not close properly. Always check that your device can accommodate the extra length.
Q: Can I also charge this battery in a regular 18650 charger?
A: Yes. The ARB-L18-3400U can be charged either through its built-in Micro-USB port or in any standard 18650 Li-ion charger that accepts button top cells. Both charging methods are safe and fully supported.
Q: Is this battery suitable for vaping or power tools?
A: No. The built-in protection circuit limits the maximum continuous discharge current to approximately 5A. Vaping devices and power tools require much higher currents (typically 15A or more). Using this battery in such devices will cause the protection circuit to cut off power or may damage the battery.
Q: How long does the battery last on a single charge?
A: Runtime depends entirely on your device's power draw. For example, a Fenix flashlight on medium mode drawing approximately 1A will run for roughly 3.5 hours. On lower modes drawing 0.3A, it can last over 10 hours. The 3400mAh capacity provides excellent endurance for medium-drain applications.
Q: Can I use a USB-C adapter with the Micro-USB port?
A: The built-in port is Micro-USB. You can use a Micro-USB to USB-C adapter, but the input remains 5V/1A regardless of the adapter. For the most reliable connection, use a standard Micro-USB cable directly.
