Fenix ARB-L18-3300 18650 3300mAh 5A 3.6V Button Top Protected Battery – for Flashlights, Headlamps & Doorbells

Description

Power your everyday devices with the genuine Fenix ARB-L18-3300, a protected 18650 button top battery that delivers dependable 3300mAh capacity at an accessible price point. Built around a quality high-capacity cell core, it provides solid runtime for LED flashlights, headlamps, smart doorbells, and outdoor lighting. Integrated overcharge, over-discharge, and short-circuit protection ensures safe, worry-free operation, while the raised button top guarantees reliable contact in Fenix, Streamlight, and most other major flashlight brands. For users seeking genuine Fenix quality and proven protection without paying for maximum capacity, the ARB-L18-3300 is the practical, everyday power solution.

Key Features

• 3300mAh Reliable Capacity – Provides solid runtime for medium-drain devices. An excellent balance of performance and value, ideal for everyday flashlights and household electronics.

• 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 devices.

• Button Top Design – Raised positive terminal ensures reliable electrical contact in Fenix, Streamlight, and most other 18650 flashlights and devices requiring a button top.

• Long Cycle Life – Retains over 80% of its initial capacity after 500 charge/discharge cycles, reducing long-term replacement costs.

• Fenix Genuine Quality – Manufactured to strict standards with premium protection circuitry for consistent, safe performance in daily use.

• Wide Compatibility – Ideal for single-cell LED torches, headlamps, doorbells, camping lanterns, and other low-to-medium drain devices drawing under 5A.

Parameters

Applications

Recommended For

• LED Flashlights & Tactical Torches: Compatible with Fenix, Streamlight, and most other brands requiring a button top 18650. The 3300mAh capacity provides solid runtime for everyday carry, dog walking, or general household use.

• Headlamps for Outdoor & Home Use: Ideal for camping, running, DIY projects, and power outage preparedness. The protection circuit prevents over-discharge damage when lights are accidentally left on.

• Smart Doorbells & Wireless Security Cameras: Many video doorbells use 18650 cells. The ARB-L18-3300 provides reliable runtime between charges, and the protection circuit adds safety for unattended operation.

• Camping Lanterns & Emergency Lights: Dependable power for weekend trips and home emergency kits. Built-in protection adds safety during long, unattended use.

• Portable Fans & Household Gadgets: Suitable for any 18650-powered device drawing under 5A. Great for neck fans, desk fans, and small electronics.

• Bicycle Lights: Consistent output for daily commuting and recreational night riding.

Not Recommended For

• RC Cars, Drones & High-Drain RC Models: These require 10–30A+ continuous current. The 5A protection limit will cut power immediately and the battery will not function. For RC use, choose dedicated high-drain unprotected cells.

• High-Power Vaping / Mechanical Mods: Require 15–35A unprotected cells. The protection circuit cannot handle these loads.

• Cordless Power Tools: Drills, saws, and impact drivers demand 15–40A, far beyond this battery's 5A limit.

• 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.

• 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-L18-3300 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: Can I use this battery for RC cars or other high-drain devices?
A: No. RC cars, drones, and similar high-drain devices require 10–30A or more of continuous current. The ARB-L18-3300's protection circuit limits output to approximately 5A. Using it in such devices will cause the protection to immediately cut off power. For RC applications, please use dedicated high-drain unprotected cells.

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: How does the 3300mAh compare to 3500mAh cells?
A: The ARB-L18-3300 offers 3300mAh, which is about 6% less capacity than a 3500mAh cell. In practical terms, this might mean 10-15 minutes less runtime on high mode in a typical flashlight. For many everyday uses, this difference is negligible, and the 3300mAh model often comes at a more accessible price point while still delivering genuine Fenix quality and full protection.

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 (1.65A) for best longevity. The built-in 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.