Description
Power your lights with confidence using the genuine Fenix ARB-L18-3400, a protected 18650 button top battery built on a premium Panasonic NCR18650B 3400mAh cell core. Designed for flashlights, headlamps, and outdoor lighting, it delivers reliable long-lasting power with built-in 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 trusted Fenix quality, the ARB-L18-3400 is the go-to power upgrade for users who value safety, runtime, and proven reliability.
Key Features
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Genuine Panasonic Cell Core – Built around the industry-respected Panasonic NCR18650B, delivering a true 3400mAh capacity for extended runtime.
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Built-in Protection Circuit – Safeguards against overcharge (4.2V), over-discharge (2.5V), short circuits, and overcurrent, protecting both the battery and your device.
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Button Top Design – Raised positive terminal ensures reliable electrical contact in Fenix, Streamlight, and most other 18650 flashlights requiring a button top.
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Long Cycle Life – Retains over 80% of initial capacity after 500 charge/discharge cycles, reducing replacement costs over time.
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Fenix Genuine Quality – Manufactured to strict standards with authentic cells and premium protection circuitry for consistent, safe performance.
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Wide Compatibility – Ideal for single-cell LED torches, headlamps, camping lanterns, and other outdoor lighting equipment.
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 3400mAh capacity delivers hours of steady illumination.
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Headlamps: Ideal for camping, running, caving, and industrial use. The protection circuit prevents over-discharge damage when lights are left on accidentally.
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Camping Lanterns & Emergency Lights: Reliable power for extended trips and power outages. The 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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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: Requires 15A+ unprotected cells. The protection circuit will cut off power under high loads.
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Cordless Power Tools: These demand 15–40A continuous current, far beyond this battery's 5A limit.
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Ultra-Compact Flashlights (tight 65mm compartments): 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-L18-3400 is compatible with most Fenix and Streamlight models, as well as many other major flashlight brands. However, 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 fully. 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?
A: No. Vaping devices, especially sub-ohm and mechanical mods, typically draw 15–35A or more. The ARB-L18-3400's protection circuit limits current to approximately 5A. Using it for vaping will cause the protection to cut off or may damage the battery. Please use dedicated unprotected high-drain cells for vaping.
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 protection circuit provides an additional safety layer, but a good charger is still essential.
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.
