Fenix ARB-L18-3500U 18650 3500mAh 5A 3.6V Micro-USB Rechargeable Button Top – Protected Cell for Flashlights, Headlamps & Doorbells
Description
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
| Parameter | Specification |
|---|---|
| Model | Fenix ARB-L18-3500U |
| 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 | Micro-USB 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 Micro-USB rechargeable battery |
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.
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
I charge these via USB when traveling and in my dedicated charger at home. The 3500mAh capacity is genuine.
My Fenix PD36R on turbo pulls 4.5A. This battery handles it without issue. The USB charging is a bonus, not a compromise.
The USB-rechargeable feature doesn't compromise the cell quality. Same great protection circuit with added convenience.
I keep these in my car emergency kit. They can be charged from any USB port. The 3500mAh provides plenty of power for my flashlight.
I've used this for 6 months in my EDC rotation. The USB port hasn't loosened, and capacity is holding at 3400mAh+.
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.