Fenix ARB-L18-3500U 18650 3500mAh USB-C Rechargeable Battery Button Top – Protected Cell for Flashlights, Headlamps & Doorbells
Description
Description
Experience the ultimate in charging convenience with the genuine Fenix ARB-L18-3500U, a premium 18650 battery featuring a built-in USB-C charging port. No external charger needed—simply plug any USB-C cable directly into the battery to recharge from a wall adapter, power bank, car charger, or laptop. Built around an authentic Panasonic NCR18650GA 3500mAh cell core, it delivers class-leading runtime with integrated overcharge, over-discharge, and short-circuit protection. The button top design ensures broad compatibility with Fenix flashlights and most other major brands. The modern USB-C port offers reversible plugging and faster, more reliable charging than older Micro-USB designs. Whether for everyday carry, camping, or smart home devices, the ARB-L18-3500U provides maximum capacity and modern charging convenience wherever a USB-C cable is available.
Key Features
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Built-in USB-C Charging Port – Recharge directly from any standard USB-C power source. No external 18650 charger required. USB-C offers reversible plugging and improved durability over Micro-USB.
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3500mAh Maximum Capacity – Powered by a genuine Panasonic NCR18650GA cell core, providing the highest possible runtime for demanding LED flashlights, headlamps, and smart home 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 (5A limit), ensuring safe and reliable operation in any compatible device.
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Button Top Design – Features a raised positive terminal for reliable contact in Fenix, Streamlight, and most other 18650 flashlights and devices requiring a button top.
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LED Charging Indicator – Convenient built-in LED shows charging status at a glance: red means charging, green means fully charged and ready to use.
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Genuine Fenix Quality – Manufactured to rigorous standards with an authentic Panasonic cell core and premium protection circuitry for long service life and consistent performance.
Parameters
| Parameter | Specification |
|---|---|
| Model | Fenix ARB-L18-3500U (USB-C Version) |
| Cell Core | Panasonic NCR18650GA |
| Typical Capacity | 3500 mAh (0.2C discharge to 2.5V) |
| Minimum Capacity | 3400 mAh |
| Nominal Voltage | 3.6 V (typical operating 3.7 V) |
| Max Continuous Discharge | 5 A (limited by built-in protection circuit) |
| Protection Functions | Overcharge (4.2V cutoff), Over-discharge (2.5V cutoff), Short Circuit, Overcurrent |
| USB Charging Input | USB-C port, 5V / 1A recommended |
| Charging Indicator | Built-in LED (Red = Charging, Green = Fully Charged) |
| Discharge Cut-off Voltage | 2.5 V (automatic protection cutoff) |
| Internal Resistance | Approx. 60–80 mΩ (including protection circuit and USB module) |
| Cycle Life | ≥ 500 cycles (to 80% capacity) |
| Operating Temperature (Discharge) | -20°C to 60°C |
| Top Type | Button Top |
| Dimensions | Approx. 18.6 mm diameter × 70.5 mm length (~5–6mm longer than standard unprotected 18650) |
| Weight (single cell) | Approx. 54 g |
| Package Includes | 1 × Fenix ARB-L18-3500U USB-C rechargeable battery |
Applications
Recommended For
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LED Flashlights & Tactical Torches: Perfect for Fenix, Streamlight, and most other brands requiring a button top 18650. The 3500mAh capacity provides maximum runtime, while USB-C charging allows convenient recharging from any modern 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, and USB-C enables easy field recharging from a power bank.
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Smart Doorbells & Wireless Security Cameras: Many video doorbells use 18650 cells. The ARB-L18-3500U provides extended runtime, and the USB-C port allows easy periodic recharging without removing the battery from the mounting bracket.
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Digital Cameras & Photography Equipment: Suitable for external battery packs powering cameras, providing long shooting sessions with reliable, protected power.
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Camping Lanterns & Emergency Lights: Any USB-C power source becomes your charger. The 3500mAh capacity ensures lights stay on through extended power outages.
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Portable Fans & Travel Gadgets: Keep your devices running with easy cable-only recharging—no separate charger to carry in your travel kit.
Not Recommended For
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Charging Cell Phones Directly: This is a battery, not a power bank. It cannot charge phones directly unless used inside a dedicated 18650 power bank case with output circuitry.
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RC Cars, Drones & High-Drain RC 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 and USB modules may conflict. Use matched unprotected cells with an external BMS instead.
FAQ
Q: How do I charge this battery?
A: Simply connect a standard USB-C cable to the charging port on the battery's positive end, and plug the other end into any USB-C or USB-A power source using an appropriate cable. The built-in LED glows red during charging and turns green when fully charged. A full charge takes approximately 5–6 hours.
Q: Can I use this battery to charge my phone?
A: No. This is a rechargeable battery designed to power compatible devices like flashlights and headlamps. It cannot directly charge a phone. To charge a phone with an 18650 battery, you need a dedicated power bank case with output circuitry. Using this battery to attempt to charge a phone directly will not work and may damage the battery or your phone.
Q: Is USB-C better than the older Micro-USB version?
A: Yes. USB-C offers several advantages: the connector is reversible (no wrong way to plug it in), more durable for frequent use, and is becoming the universal standard for modern electronics. You likely already have USB-C cables available for your phone or other devices.
Q: Will this fit my flashlight?
A: It fits most flashlights that accept button top 18650 cells. Due to the integrated USB-C charging 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. Some ultra-compact lights designed for unprotected flat top cells may not close completely.
Q: Can I also charge this in a regular 18650 charger?
A: Yes. The ARB-L18-3500U can be charged either through its built-in USB-C port or in any standard 18650 Li-ion charger that accepts button top cells. Both methods are safe and fully supported.
Q: Is this battery suitable for vaping or RC cars?
A: No. Vaping devices and RC cars require 15–35A of continuous current. The ARB-L18-3500U's protection circuit limits output to approximately 5A. Using it in such devices will cause the protection to cut off and may damage the battery. For these applications, use dedicated high-drain unprotected cells.
Shipping and Returns
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Free Shipping: Enjoy free shipping on all orders over $65. For orders under $65, the shipping cost is $8.99.
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Delivery Time: Once shipped, orders typically arrive within 7–15 business days.
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Easy Returns: We want you to be completely satisfied. If you're not, you can return your product within 30 days of receiving your order. Please ensure the items are unused and in their original condition. For return instructions, please contact our support team.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Security
The combination of 4000mAh capacity, Type-C charging, and power bank output makes this the most versatile 18650 available.
The 4000mAh gives me two full days in my vape. The Type-C port charges it in about 4 hours.
I no longer carry a separate power bank. Two of these in my bag can fully charge my phone. Genius product.
My kids' toys with 18650 adapters run on these. The Type-C charging means they can top them up themselves.
The protection circuit works for both input and output. I've accidentally shorted the USB port and it shut off safely.
Refund Policy
OneAndes Return & Refund Policy
At OneAndes, we are committed to providing high-quality cylindrical lithium-ion batteries for your drones, vacuums, garden tools, and other power needs. If you are not completely satisfied with your purchase, we are here to help. Please read our full return policy below before initiating a return.
1. Return Window
You have 30 calendar days from the date you received your item(s) to request a return. Any return request submitted after 30 days will not be eligible for a refund or exchange.
2. Eligibility Conditions
To qualify for a return, all items must meet the following conditions:
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Condition: Items must be unused, undamaged, and in the same condition that you received them.
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Packaging: Items must be returned in their original packaging with all accessories, manuals, and protective covers intact.
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Proof of Purchase: A valid receipt, order confirmation email, or proof of purchase must accompany all returns.
Non-Returnable Items:
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Batteries that have been installed, used, or show any signs of wear.
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Items marked as “Final Sale” or “Clearance” at the time of purchase.
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Customized or special-order products.
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Gift cards.
If a returned item fails to meet these conditions, we reserve the right to deny the return or charge a restocking fee.
3. How to Initiate a Return
Follow these steps to return your product:
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Contact Us: Email our support team at support@oneandes.com with your order number and the reason for return. We aim to respond to all return requests within 24 hours on business days.
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Receive RMA: We will provide you with a Return Merchandise Authorization (RMA) number and return instructions. Do not ship any item without an RMA number.
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Pack Securely: Place the item in its original packaging, include all accessories, and clearly write the RMA number on the outside of the box.
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Ship to Our US Warehouse: Ship the package to the following address:
OneAndes Returns
10320 6th St
Rancho Cucamonga, CA 91730
USA*Important: Lithium-ion batteries are classified as hazardous materials (Class 9). Please follow the shipping guidelines provided in Section 4 below. We recommend using a trackable shipping service and purchasing shipping insurance, as we cannot guarantee receipt of your returned item.*
4. Return Shipping Costs
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Defective or Incorrect Items: If the item you received is defective, damaged in transit, or different from what you ordered, OneAndes will cover the return shipping cost. In this case, we will provide you with a prepaid return shipping label.
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Buyer’s Remorse / Non-Defective Returns: If you are returning an item for any other reason (e.g., no longer needed, ordered the wrong model), you are responsible for the return shipping costs. You must prepay the return shipping cost using a trackable carrier that accepts lithium batteries. We do not provide prepaid return labels for non-defective returns.
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Lithium Battery Shipping Regulations: By law, all returns must be shipped in compliance with applicable dangerous goods regulations. We will provide guidance on proper packaging and labeling. Failure to comply may result in carrier refusal, seizure, or additional fees. We are not responsible for returned items lost or rejected by the carrier due to improper shipping.
5. Refunds
Once we receive and inspect your return at our Rancho Cucamonga, CA facility, we will notify you via email of the approval or rejection of your refund.
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Approved Refunds: If approved, your refund will be processed to your original method of payment within 5 to 10 business days. Please note that depending on your bank or credit card issuer, it may take additional time for the credit to appear on your statement.
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Partial Refunds: In certain situations, only partial refunds may be granted:
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Items not in original condition, missing parts, or damaged for reasons not due to our error.
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Items returned more than 30 days after delivery (reviewed on a case-by-case basis).
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Non-Refundable Fees: Original shipping charges are non-refundable unless the return is due to our error (defective product or incorrect shipment).
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Restocking Fee: We do not charge a restocking fee for defect-free returns, but we may deduct the return shipping cost, which will be deducted from your refund.
6. Exchanges
We replace items only if they are defective or damaged upon arrival. If you need to exchange a defective item for the same product, please contact us at support@oneandes.com. Exchanges are subject to product availability.
If you ordered the wrong battery size or model, please follow the standard return process above and place a new order for the correct item.
7. Damaged or Missing Items
If your package arrives visibly damaged, please take photos of the package before opening and contact us immediately. We will work with the shipping carrier to file a claim and arrange for a replacement or refund. Damaged or missing item claims must be reported within 7 calendar days of delivery. For immediate assistance, you may also call us at (213) 316-8849.
8. Order Cancellation
You may cancel your order without penalty if it has not yet been shipped. To cancel, email us at support@oneandes.com as soon as possible. If the order has already been processed or shipped, you will need to follow the standard return process upon receipt.
9. Warranty
All OneAndes batteries are backed by a 12-month limited warranty against defects in materials and workmanship. This warranty does not cover damage caused by misuse, improper charging, unauthorized modifications, normal wear and tear, or use outside of manufacturer specifications. For warranty claims, please contact our support team.
10. Contact Us
If you have any questions about our Return & Refund Policy, please reach out:
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Email: support@oneandes.com
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Phone: (213) 316-8849 (Mon-Fri, 9 AM – 5 PM Pacific Time)
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Mailing Address: 10320 6th St, Rancho Cucamonga, CA 91730, USA
We aim to respond to all inquiries within 24 hours during business days. Please include your order number for faster assistance.