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The Panasonic 26650A is an industrial-grade lithium-ion cell manufactured by Panasonic, featuring a nominal capacity of 5000mAh and a nominal voltage of 3.7V. As a premium A-grade cell, it utilizes advanced NCA (Nickel Cobalt Aluminum) chemistry, delivering exceptional discharge platform stability and long-term reliability—making it an ideal power source for high-power flashlights, e-bikes, energy storage systems, and DIY battery pack projects.
This product is available in three top-terminal variants to suit different project needs. The Large Button Top (67.2mm height) features a larger protruding button suitable for series connection. The Small Button Top (66.6mm height) features a smaller protruding button, also suitable for series connection, and is the default shipping version. The Flat Top (65.5mm height) has a standard flat terminal and is not suitable for series connection.
The 5000mAh high capacity is a leading specification in the 26650 format. Combined with stable 3.7V output and low self-discharge, a single charge delivers extended runtime for power-hungry devices. With a cycle life of 500+ charges, this cell maintains consistent performance over long-term use under proper conditions.
5000mAh High Capacity: A-grade industrial cell providing lasting power for high-power flashlights and energy storage devices
Stable Discharge Platform: NCA chemistry ensures steady voltage under load—no sudden dropouts or flickering
Three Top-Terminal Options: Large Button Top / Small Button Top (suitable for series) / Flat Top (not suitable for series), fitting different battery compartment designs
Low Self-Discharge: Minimal power loss during long-term storage, ideal for backup power applications
Long Cycle Life: 500+ charge-discharge cycles with slow performance degradation
Japanese Manufacturing Quality: Genuine Panasonic cell with guaranteed consistency and safety
High-Power Flashlights: Large capacity supports extended high-brightness output; stable discharge platform prevents brightness fade
E-Bikes and Small EVs: Reliable power for low-speed electric vehicles
Energy Storage Systems: Solar storage, UPS backup power, and portable power station battery packs
Power Tools: Suitable for moderate-power tool battery pack assembly
DIY Battery Packs: Series or parallel assembly for custom packs (flat top not recommended for series)
Q1: What is the capacity of this battery?
A: The nominal capacity is 5000mAh (5.0Ah), a high-capacity level for the 26650 format.
Q2: What is the difference between the three top-terminal variants? Which should I choose?
A: The Large Button Top (67.2mm) and Small Button Top (66.6mm) have protruding positive terminals suitable for series connection, ensuring reliable contact between cells. The Flat Top (65.5mm) has a flat terminal and is not suitable for series connection—poor contact may cause circuit breaks or arcing. Choose button top versions for battery pack assembly; flat top is fine for battery holders or spot-welding.
Q3: What is the maximum discharge current?
A: Maximum continuous discharge is 10A, with continuous discharge at approximately 5.5A.
Q4: Does this battery have a protection circuit?
A: No. This is an unprotected bare cell and must be used with a BMS or device equipped with overcharge/over-discharge protection. Do not discharge below 2.5V.
Q5: How should I charge it?
A: Use CC-CV (constant current, constant voltage) charging with a cut-off voltage of 4.2V. Maximum charge current is approximately 3.4A. Use a charger specifically designed for Li-ion cells.
Q6: How should I store the 10-pack?
A: Store in a cool, dry place at approximately 3.7V storage voltage (around 40%–60% state of charge), using insulating protective cases to prevent short circuits.
Free Shipping: Enjoy free shipping on all orders over $65. For orders under $65, the shipping cost is $8.99.
Delivery Time: Once shipped, orders typically arrive within 7–15 business days.
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.
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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:
Condition: Items must be unused, undamaged, and in the same condition that you received them.
Packaging: Items must be returned in their original packaging with all accessories, manuals, and protective covers intact.
Proof of Purchase: A valid receipt, order confirmation email, or proof of purchase must accompany all returns.
Non-Returnable Items:
Batteries that have been installed, used, or show any signs of wear.
Items marked as “Final Sale” or “Clearance” at the time of purchase.
Customized or special-order products.
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:
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.
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.
Pack Securely: Place the item in its original packaging, include all accessories, and clearly write the RMA number on the outside of the box.
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
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.
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.
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.
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.
Partial Refunds: In certain situations, only partial refunds may be granted:
Items not in original condition, missing parts, or damaged for reasons not due to our error.
Items returned more than 30 days after delivery (reviewed on a case-by-case basis).
Non-Refundable Fees: Original shipping charges are non-refundable unless the return is due to our error (defective product or incorrect shipment).
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:
Email: support@oneandes.com
Phone: (213) 316-8849 (Mon-Fri, 9 AM – 5 PM Pacific Time)
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.
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