14500CY 3.8V 900mAh Li-ion Flat Top Battery (2-Pack) - High Capacity INR15/50 Replacement for Flashlights & DIY Electronics
Description
Product Description:
Upgrade your devices with the premium FDK / Sony 14500CY 3.8V 900mAh Li-ion Flat Top Battery (2-Pack). This is a Bare Flat Top Cell (No Solder Tabs). Unlike standard 3.7V 14500 cells, this advanced INR15/50 cylindrical cell delivers an impressive 3.8V nominal voltage and a massive 900mAh capacity, providing superior energy density (3.42Wh) for devices that require extended runtime.
Whether you are powering high-performance EDC flashlights, upgrading DIY electronics, or building custom battery packs, this Japanese-origin cell offers reliable, stable discharge and exceptional longevity.
Important Note:
This is a Bare Flat Top battery. It does NOT come with any pre-welded solder tabs. It is designed for use in standard flashlight battery compartments (spring-loaded) or for DIY spot-welding into custom battery packs.
Voltage Warning: This is a High-Voltage Li-ion cell (3.8V, fully charged to 4.35V). Please confirm that your device's driver circuit can handle a fully charged voltage of up to 4.35V to avoid performance or overheating issues.
Key Features:
High Capacity 900mAh & 3.8V Output: A significant upgrade over traditional 3.7V 680-750mAh cells, delivering 3.42Wh of total energy.
Premium Japanese Quality: Manufactured by FDK/Sony (INR15/50), ensuring low internal resistance, consistent voltage, and exceptional safety standards.
Standard Flat Top Design: Bare cell (No Tabs), perfect for spring-loaded flashlight contacts or custom spot-welding projects.
Long Cycle Life: Supports 500+ recharge cycles, making it an economical and eco-friendly power solution.
Convenient 2-Pack: Always have a spare charged battery ready for your EDC gear.
Parameters:
| Parameter | Specification |
|---|---|
| Brand / Factory Origin | FDK / Sony (Japan) |
| Model Number | 14500CY / INR15/50 |
| Size / Type | 14500 (AA Size equivalent, Li-ion) |
| Capacity | 900mAh |
| Nominal Voltage | 3.8V (High Voltage) |
| Fully Charged Voltage | 4.35V |
| Energy | 3.42Wh |
| Terminal Type | Flat Top (Bare Cell - NO Solder Tabs) |
| Dimensions | Approx. 14mm (Diameter) x 48mm (Height) |
| Rechargeable Cycles | 500+ cycles |
Applications:
High-Performance EDC Flashlights & Tactical Torches (check 4.35V compatibility)
DIY Electronics & Prototyping (Arduino, ESP32)
Custom Battery Pack Building (Spot welding required)
Replacement for older 3.7V 14500 flat-top cells
Emergency Outdoor Gear and Bike Lights
FAQ:
Q: Does this battery come with solder tabs?
A: No, this is a Bare Flat Top cell. It does not come with any solder tabs. It is designed for standard flashlight spring contacts or DIY spot-welding.
Q: What is the difference between this 3.8V battery and a standard 3.7V battery?
A: A 3.8V battery (often called HV or High Voltage) reaches a maximum full charge of 4.35V, whereas standard 3.7V cells only reach 4.20V. This provides higher runtime, but ensure your device supports this voltage.
Q: Can I use this in my normal 3.7V flashlight?
A: In most LED flashlights, it works perfectly. However, if your flashlight gets very hot quickly, stop using it, as the driver might not be designed for 4.35V.
Q: Is this battery protected (with a built-in PCB)?
A: No. This is an unprotected bare cell. It relies on your device's built-in protection circuitry.
Shipping and Returns
-
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.
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

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:
-
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.
