Fenix ARB-L18-3400U 18650 3400mAh 3.6V USB Rechargeable Battery Button Top – Built-in Micro-USB Charging Port
Description
Description
Experience ultimate charging convenience with the Fenix ARB-L18-3400U, a genuine 18650 battery featuring a built-in Micro-USB charging port. No external charger required — simply plug any Micro-USB cable directly into the battery to recharge from a USB wall adapter, power bank, car charger, or laptop. Built around a premium Panasonic NCR18650B 3400mAh cell core, it delivers long-lasting power with integrated overcharge, over-discharge, and short-circuit protection. The button top design ensures broad compatibility with Fenix flashlights and most other brands requiring a raised positive contact. Whether you are on a camping trip, traveling, or preparing for emergencies, the ARB-L18-3400U keeps you powered up wherever a USB port is available.
Key Features
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Built-in Micro-USB Charging Port – Recharge directly from any standard 5V USB power source. No external 18650 charger needed. Perfect for travel, camping, and on-the-go convenience.
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3400mAh High Capacity – Powered by a genuine Panasonic NCR18650B cell core, providing extended runtime for high-output LED flashlights, headlamps, and portable 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, ensuring safe and reliable operation.
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LED Charging Indicator – A convenient built-in LED glows red while charging and turns green when fully charged, so you know exactly when the battery is ready.
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Button Top Design – Features a raised positive terminal for compatibility with Fenix flashlights and other devices requiring a button top contact.
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Genuine Fenix Quality – Manufactured to rigorous standards with authentic Panasonic cell core and premium protection circuitry for long service life and consistent performance.
Parameters
| Parameter | Specification |
|---|---|
| Model | Fenix ARB-L18-3400U |
| Cell Core | Panasonic NCR18650B |
| Typical Capacity | 3400 mAh (0.2C discharge to 2.5V) |
| Nominal Voltage | 3.6 V (typical operating 3.7 V) |
| Max Continuous Discharge | 5 A (limited by built-in protection board) |
| 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) |
| 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 × 70.2 mm length (~5mm longer than standard 18650) |
| Weight (single cell) | Approx. 52 g |
| Package Includes | 1 × Fenix ARB-L18-3400U USB rechargeable battery |
Applications
Recommended For
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LED Flashlights & Tactical Torches: Perfect for Fenix lights and most other brands requiring a button top 18650. The 3400mAh capacity ensures long runtime, while USB charging allows convenient recharging anywhere.
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Headlamps for Camping & Outdoor Activities: No need to carry a bulky charger. Recharge from a power bank at camp or from a car USB port between hikes.
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Camping Lanterns & Emergency Lights: Simplify your gear list. Any USB power source becomes your charger.
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Portable Fans & Handheld Devices: Keep your cooling fans and gadgets running with easy USB recharging.
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Travel & EDC Kits: Minimize accessories. One USB cable charges your phone and your battery.
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Emergency Preparedness: In a power outage or disaster scenario, any available USB port can recharge this battery to keep your essential lights working.
Not Recommended For
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High-Power Vaping / Mechanical Mods: The built-in protection limits discharge current to approximately 5A. High-drain vaping devices require 15A+ unprotected cells.
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Cordless Power Tools: These demand 15–40A continuous current, far beyond this battery's protection limit.
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Devices with Tight Battery Compartments: This battery is approximately 70.2mm long (about 5mm longer than a standard unprotected 18650). Some compact flashlights 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 when connected in series. Use matched unprotected cells with an external BMS instead.
FAQ
Q: How do I charge this battery?
A: Simply connect a standard Micro-USB cable to the charging port on the battery's positive end. Plug the USB-A end into any standard 5V USB power source such as a phone charger, power bank, laptop USB port, or car USB adapter. The built-in LED glows red during charging and turns green when fully charged. A full charge takes approximately 4–5 hours.
Q: Can I use this battery in any 18650 device?
A: It fits most devices that accept button top 18650 cells. However, due to the integrated USB charging port and protection circuit, this battery is approximately 70.2mm long — about 5mm longer than a standard unprotected 18650. Some compact flashlights with very tight battery compartments may not close properly. Always check that your device can accommodate the extra length.
Q: Can I also charge this battery in a regular 18650 charger?
A: Yes. The ARB-L18-3400U can be charged either through its built-in Micro-USB port or in any standard 18650 Li-ion charger that accepts button top cells. Both charging methods are safe and fully supported.
Q: Is this battery suitable for vaping or power tools?
A: No. The built-in protection circuit limits the maximum continuous discharge current to approximately 5A. Vaping devices and power tools require much higher currents (typically 15A or more). Using this battery in such devices will cause the protection circuit to cut off power or may damage the battery.
Q: How long does the battery last on a single charge?
A: Runtime depends entirely on your device's power draw. For example, a Fenix flashlight on medium mode drawing approximately 1A will run for roughly 3.5 hours. On lower modes drawing 0.3A, it can last over 10 hours. The 3400mAh capacity provides excellent endurance for medium-drain applications.
Q: Can I use a USB-C adapter with the Micro-USB port?
A: The built-in port is Micro-USB. You can use a Micro-USB to USB-C adapter, but the input remains 5V/1A regardless of the adapter. For the most reliable connection, use a standard Micro-USB cable directly.
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
This battery has simplified my travel kit. One Micro-USB cable charges everything. The button top works in all my devices.
After trying several brands, Fenix's USB implementation is the cleanest. The port is hidden under the positive cap and doesn't affect fitment.
My wireless camera runs on this battery. I can charge it in place without removing the camera from its mount. The 3400mAh lasts about 2 weeks.
My Opus charger showed 3380mAh after a full discharge test. The USB charging circuit doesn't interfere with normal charger use.
I've plugged and unplugged this battery hundreds of times. The port cover hasn't torn and the connection remains solid. Fenix engineering is impressive.
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.