Description
Charge anywhere, anytime with the genuine Fenix ARB-L18-3500U. This innovative 18650 battery features a built-in Micro-USB charging port, eliminating the need for a dedicated charger. Simply plug a standard Micro-USB cable directly into the battery and recharge from any USB power source. Built on a premium Panasonic NCR18650GA 3500mAh cell core, it delivers exceptional runtime for LED flashlights, headlamps, and smart doorbells. Integrated overcharge, over-discharge, and short-circuit protection ensure safe operation, while the button top design guarantees reliable contact in Fenix lights and most major brands. The built-in LED indicator shows charging status at a glance.
Key Features
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Built-in Micro-USB Charging Port – Recharge directly from any 5V USB source: wall adapter, power bank, car charger, or laptop. No external 18650 charger needed.
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3500mAh Maximum Capacity – Powered by a genuine Panasonic NCR18650GA cell core, providing industry-leading runtime for high-output devices.
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Integrated 3-in-1 Protection – Built-in circuit guards against overcharge, over-discharge, and short circuits, protecting both the battery and your device.
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LED Charging Indicator – Convenient built-in LED glows red while charging and turns green when fully charged.
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Button Top Design – Raised positive terminal ensures secure contact in Fenix, Streamlight, and most other 18650-powered devices requiring a button top.
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Genuine Fenix Quality – Manufactured to strict standards with authentic Panasonic cells and premium protection circuitry for long service life.
Parameters
Applications
Recommended For
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LED Flashlights & Tactical Torches: Perfect for Fenix, Streamlight, and most other brands. The 3500mAh capacity provides maximum runtime, while USB charging allows convenient recharging from any USB source.
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Headlamps for Outdoor & Professional Use: Ideal for camping, running, caving, and industrial work. The protection circuit prevents over-discharge damage if lights are left on.
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Smart Doorbells & Security Cameras: Many video doorbells use 18650 cells. The ARB-L18-3500U provides extended runtime, and the USB port enables easy periodic recharging without removing the battery.
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Camping Lanterns & Emergency Lights: Any USB power source becomes your charger. The 3500mAh capacity ensures lights stay on through extended outages.
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Portable Fans & Travel Gadgets: Keep your devices running with easy cable-only recharging—no separate charger to carry.
Not Recommended For
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RC Cars, Drones & High-Drain Models: These demand 10–30A+ continuous current. The 5A protection limit will cut power immediately.
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High-Power Vaping / Mechanical Mods: Require 15–35A unprotected cells. The protection circuit cannot handle these loads.
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Cordless Power Tools: Drills, saws, and impact drivers require 15–40A, far beyond this cell's capability.
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Ultra-Compact Flashlights (≤65mm battery tubes): This battery is ~70.5mm long. Some compact lights may not close fully. Verify fit before ordering.
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Multi-Cell Series Packs: Individual protection boards may conflict. Use matched unprotected cells with an external BMS.
FAQ
Q: How do I charge this battery?
A: Connect a standard Micro-USB cable to the charging port on the battery's positive end, and plug the USB-A end into any 5V USB power source. The built-in LED glows red while charging and turns green when fully charged. A full charge takes approximately 5–6 hours.
Q: Can this battery be used in RC cars or other high-drain devices?
A: No. This is a protected cell designed for low-to-medium drain devices like flashlights, headlamps, and doorbells. RC cars, drones, and similar devices require 10–30A or more, which will immediately trigger the 5A protection circuit and cut off power.
Q: Will this fit my flashlight?
A: It fits most flashlights that accept button top 18650 cells. Due to the integrated USB port and protection circuit, the battery is approximately 70.5mm long—about 5–6mm longer than a standard unprotected 18650. Please measure your device's battery compartment before ordering.
Q: Can I also charge this in a regular 18650 charger?
A: Yes. The ARB-L18-3500U can be charged through its built-in Micro-USB port or in any standard 18650 Li-ion charger that accepts button top cells. Both methods are safe.
Q: Is this battery suitable for vaping?
A: No. Vaping devices require 15–35A of continuous current. The ARB-L18-3500U's protection circuit limits output to approximately 5A. For vaping, use dedicated high-drain unprotected cells.
Q: How should I store this battery long-term?
A: Store at approximately 3.6–3.7V (40–50% charge) in a cool, dry place using a non-conductive battery case. Avoid storing fully charged or fully discharged for extended periods.
