Description
Power your lights with confidence using the genuine Fenix ARB-L18-3500, a protected 18650 button top battery built on a premium Panasonic NCR18650GA 3500mAh cell core. Designed for flashlights, headlamps, and outdoor lighting, it delivers industry-leading runtime with integrated overcharge, over-discharge, and short-circuit protection. The raised button top ensures solid contact in Fenix, Streamlight, and most other major flashlight brands. With excellent cycle life and Fenix’s trusted quality, the ARB-L18-3500 is the go-to power upgrade for users who value safety, maximum runtime, and proven reliability in every charge.
Key Features
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Genuine Panasonic NCR18650GA Cell Core – Built around one of the most respected high-capacity 18650 cells, delivering a true 3500mAh for maximum runtime in demanding LED devices.
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Built-in Protection Circuit – Safeguards against overcharge (4.2V cutoff), over-discharge (2.5V cutoff), short circuits, and overcurrent, protecting both the battery and your valuable equipment.
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Button Top Design – Raised positive terminal ensures reliable electrical contact in Fenix, Streamlight, and most other 18650 flashlights and devices requiring a button top.
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Long Cycle Life – Retains over 80% of its initial capacity after 500 charge/discharge cycles, reducing long-term replacement costs.
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Fenix Genuine Quality – Manufactured to strict standards with authentic Panasonic cells and premium protection circuitry for consistent, safe performance.
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Wide Compatibility – Ideal for single-cell LED torches, headlamps, camping lanterns, bicycle lights, and other outdoor illumination equipment drawing under 5A.
Parameters
Applications
Recommended For
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LED Flashlights & Tactical Torches: Perfect for Fenix, Streamlight, and other quality brands requiring a button top 18650. The 3500mAh capacity delivers hours of steady illumination.
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Headlamps for Outdoor & Professional Use: Ideal for camping, running, caving, and industrial work. The protection circuit prevents over-discharge damage when lights are accidentally left on.
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Camping Lanterns & Emergency Lights: Reliable power for extended trips and power outages. Built-in protection adds safety during long, unattended use.
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Bicycle Lights: Consistent output for night riding. Single-cell runtime easily covers long commutes or training sessions.
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Smart Doorbells & Wireless Security Cameras: Many video doorbells use 18650 cells. The ARB-L18-3500 provides extended runtime with safe, reliable power.
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Portable Fans & Outdoor Gadgets: Suitable for any 18650-powered device drawing under 5A where safe, plug-and-play convenience is valued.
Not Recommended For
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High-Power Vaping / Mechanical Mods: These require 15–35A unprotected cells. The protection circuit will cut off power under heavy loads.
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Cordless Power Tools: Drills, saws, and impact drivers demand 15–40A, far beyond this battery’s 5A limit.
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RC Cars, Drones & High-Drain RC Models: These require 10–30A+ continuous current. This battery will not function and may trigger protection.
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Ultra-Compact Flashlights with Tight 65mm Battery Tubes: The protected button top design adds length (~68.5mm). Some compact lights 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. Use matched unprotected cells with an external BMS instead.
FAQ
Q: Is this battery compatible with my Streamlight / Fenix / other brand flashlight?
A: If your flashlight accepts 18650 batteries and requires a button top (raised positive terminal), then yes. The ARB-L18-3500 is compatible with most Fenix and Streamlight models, as well as many other major flashlight brands. Due to the protection circuit and button top, the battery is approximately 68.5mm long. Some ultra-compact lights with very tight battery tubes may not close properly. Please check your device’s battery compartment length before ordering.
Q: What does "protected" mean and why should I choose a protected cell?
A: A protected cell has a small circuit board added to the negative end that automatically prevents overcharge (above 4.2V), over-discharge (below 2.5V), short circuits, and excessive current draw. This makes single-cell use much safer, especially in devices without their own battery management. The trade-off is a slightly longer cell (68.5mm vs. 65mm) and a current limit of around 5A.
Q: Can I use this battery for vaping or RC cars?
A: No. Vaping devices and RC cars require high continuous currents (typically 15–35A or more). The ARB-L18-3500's protection circuit limits current to approximately 5A. Using it in such devices will cause the protection to cut off power or may damage the battery. Please use dedicated unprotected high-drain cells for those applications.
Q: How should I charge this battery?
A: Use a quality lithium-ion battery charger with a CC-CV algorithm designed for 18650 cells. Fenix chargers are an excellent match. Charge at 0.5C (1.7A) for best longevity. The built-in protection circuit provides an additional safety layer, but a good charger is still essential. Never use damaged or low-quality chargers.
Q: How should I store this battery when not in use?
A: Store at approximately 3.6–3.7V (40–50% charge) in a cool, dry place. Use a non-conductive battery case to prevent accidental short circuits. Avoid storing fully charged or fully discharged for extended periods, as this accelerates capacity loss.
