SwisLight INR 26650 A 3.7V 5700mAh 20A High-Drain Li-ion Battery – Small Button Top for High-Power Series Connections (2pcs)
Description
Product Description:
The SwisLight INR 26650 A is a premium Swiss-designed 26650 high-drain lithium-ion battery engineered for high-capacity, high-power applications. This 2pcs bundle delivers a massive 5700mAh capacity and an impressive 20A continuous discharge current, making it the ideal power core for multi-battery high-power series connections and demanding devices such as high-intensity tactical flashlights, professional camera flashes, and high-torque power tools.
Built with advanced ternary lithium chemistry, this cell offers ultra-low internal resistance, high energy density, and reliable performance under sustained heavy loads. The small button top design supports series connection, perfect for building custom high-power battery packs. Please note: If your device requires a Large Button Top (67.5mm length) instead of the standard Small Button Top (67mm length), please let us know when placing your order.
Key Features:
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2pcs of SwisLight INR 26650 A Premium Cells: High-quality Swiss-designed 26650 Li-ion batteries with a true 5700mAh capacity.
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20A High Continuous Discharge: Delivers a powerful 20A continuous output for the most demanding applications.
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Ternary Lithium Chemistry: Provides ultra-low internal resistance, high energy density, and excellent power delivery.
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Small Button Top Design: Features a small protruding positive terminal (67mm length) that supports series connection.
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Customizable Top Option: A Large Button Top (67.5mm) is available upon request for devices requiring a larger contact surface.
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Swiss Engineering Quality: Built to high standards for durability, consistency, and reliable performance.
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Standard 26650 Size: Perfectly fits standard 26650 battery compartments (26.2mm diameter).
Product Parameters:
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Brand: SwisLight
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Model: INR 26650 A
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Size: 26650
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Capacity: 5700mAh (21Wh)
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Nominal Voltage: 3.7V
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Continuous Discharge Current: 20A
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Chemistry: Ternary Li-ion (Lithium Ion)
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Top Type: Small Button Top (Standard, 67mm) / Large Button Top (Custom, 67.5mm)
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Series Connection Support: Yes
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Dimensions: 26.2mm (Diameter) x 67mm (Height - Small Button Top)
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Pack Quantity: 2pcs
Applications:
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High-Intensity Tactical Flashlights: Powers the brightest tactical flashlights and searchlights with 20A continuous energy.
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Professional Camera Flashes: Delivers sustained 20A power for rapid recycle times and burst shooting.
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High-Torque Cordless Power Tools: Drives demanding power tools, impact drivers, and electric drills.
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High-Performance RC Hobbies & Drones: Provides sustained high-current power for high-torque RC cars and drones.
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Multi-Battery Series Battery Packs: Ideal core for building custom 24V, 36V, or 48V battery packs.
Frequently Asked Questions (FAQ):
Q1: What is the discharge current of this battery?
A1: This SwisLight INR 26650 A is rated for a powerful 20A continuous discharge current, making it one of the highest-performing 26650 cells available for power-hungry applications.
Q2: What is the difference between the Small Button Top and Large Button Top?
A2: The standard Small Button Top has a length of 67mm. If your device requires a larger contact surface, a Large Button Top version is available at 67.5mm length. Please mention your requirement when placing your order.
Q3: Can I use these batteries in series?
A3: Yes, the button top design supports series connection, making this battery ideal for building custom multi-battery high-power battery packs.
Q4: What is the advantage of the ternary lithium chemistry?
A4: Ternary lithium chemistry provides higher energy density, lower internal resistance, and better high-current discharge performance compared to standard Li-ion cells. This makes it the ideal choice for high-drain devices like camera flashes and power tools.
Q5: What kind of charger should I use for this battery?
A5: You must use a charger specifically designed for 3.6V/3.7V Li-ion batteries with a 4.2V cut-off voltage. Do not use a standard AA/AAA Ni-MH charger.
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
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Security

If you have a high-current device, these are a must-buy. The low IR prevents voltage drops and increases efficiency.
I'm impressed with how well these handle my daily power tools.
I used these to refurbish an old battery pack for my drill. The performance is better than the original factory cells.
It prevents accidental short circuits in tight metallic housings, which is a huge safety feature.
Despite the huge capacity, they recharge surprisingly fast. My high-amp charger gets them back to 4.2V in no time.
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.
