4-Pack Vapcell K25 18650 2500mAh 20A CDR Flat Top Battery – Long Cycle Life for Flashlights & Power Tools
Description
Description
Get reliable high-current power that lasts with the Vapcell K25, a 2500mAh 18650 cell engineered for both performance and endurance. This 4-pack delivers a true 20A continuous discharge with a 35A pulse ceiling, making it an ideal choice for sub-ohm vaping, FET-driven flashlights, cordless power tools, and RC models. Unlike standard high-drain cells that degrade after 250–300 cycles, the K25's extended cycle life retains over 80% capacity after 500+ charge/discharge cycles. The flat top design ensures universal compatibility with spring-loaded contacts and simplifies spot-welding for custom battery packs. When your high-drain devices demand consistent power day after day, the Vapcell K25 delivers—and keeps delivering.
Key Features
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20A Continuous / 35A Pulse Discharge – True 20A CDR handles sub-ohm builds, power tool start-up surges, and FET turbo flashlights with ease. Pulse capability up to 35A provides extra headroom for short, intense bursts.
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2500mAh Balanced Capacity – Optimized for high-drain applications. Provides solid runtime for daily use while maintaining full 20A output capability throughout the discharge cycle.
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Extended Cycle Life (500+ Cycles) – Engineered to last approximately twice as long as standard high-drain cells. Retains over 80% capacity after 500 charge/discharge cycles, dramatically reducing long-term replacement costs for frequently used devices.
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Flat Top Design – Universally compatible with all standard 18650 spring-contact chargers, flashlights, and battery trays. The flat terminal is ideal for spot-welding nickel strips in custom battery packs.
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4-Pack Value – Perfect for dual-battery regulated mods, rebuilding a tool battery pack, or keeping spares ready for your high-drain flashlights and RC gear.
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Vapcell Quality Control – Each cell is tested and matched for consistent capacity and low internal resistance, ensuring reliable performance across the entire pack.
Parameters
| Parameter | Specification |
|---|---|
| Model | Vapcell K25 18650 |
| Typical Capacity | 2500 mAh (0.2C discharge to 2.5V) |
| Minimum Capacity | ~2400 mAh |
| Nominal Voltage | 3.6 V (typical operating 3.7 V) |
| Max Continuous Discharge (CDR) | 20 A (cell temperature ≤ 80°C) |
| Max Pulse Discharge | 35 A (short burst <10 sec, monitor temperature; not for continuous use) |
| Discharge Cut-off Voltage | 2.5 V (do not over-discharge) |
| Standard Charge | CC-CV, 0.5C (1250 mA) to 4.2 V, cut-off 50 mA |
| Max Charge Current | 1C (2500 mA); 0.5C recommended for best longevity |
| Internal Resistance | ≤ 20 mΩ (AC 1 kHz) |
| Cycle Life | ≥ 500 cycles (to 80% capacity, 0.5C charge / 1C discharge) |
| Operating Temperature (Discharge) | -20°C to 60°C (ensure adequate cooling for sustained 20A) |
| Top Type | Flat Top |
| Dimensions | Approx. |
| 18.4 mm diameter × 65.0 mm length | Weight (single cell) | Approx. |
| 47 g | Package Includes | 4 × Vapcell K25 18650 cells in protective packaging |
Applications
Recommended For
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Medium-High Power Vaping: Regulated mods and mechanical mods with builds safely within the 20A continuous limit (e.g., 0.18Ω and above at 3.6V). The 35A pulse provides a generous safety margin for short draws. The extended cycle life means fewer battery swaps over the long term.
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FET-Driven High-Output Flashlights: Hot-rod lights and multi-emitter torches that pull 10–20A on turbo. Enjoy consistent peak brightness backed by the endurance of 500+ recharge cycles.
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Light-to-Medium Cordless Power Tools: Impact drivers, drills, and wrenches when used in properly built battery packs with a BMS. The long cycle life is especially valuable for tools used daily on the job site.
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RC Cars, Boats & Airsoft: Competitive models requiring 15–25A instantaneous burst currents. The 35A pulse handles aggressive starts and maneuvers, while the long cycle life keeps you racing through many seasons.
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DIY High-Drain Battery Packs: Spot welders, portable jump starters, and any project where both consistent high current output and long service life are essential.
Not Recommended For
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Extreme Sub-Ohm Vaping / Competition Mods (>20A Continuous): These demand 25–35A continuous discharge. Choose the Vapcell K30 (30A CDR) or Molicel P26A (35A CDR) for builds below 0.15Ω.
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Heavy-Duty Power Tools: Angle grinders, circular saws, and rotary hammers require 30–40A continuous current. Use dedicated ultra-high-drain cells instead.
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Ultra-Long Runtime Low-Power Devices: Solar lights, wireless sensors, and standard USB power banks. A 3500–4000mAh high-capacity cell will provide significantly longer runtime for these applications.
FAQ
Q: What makes the K25 a "long cycle life" battery? How does it compare to standard cells?
A: Standard high-drain 18650 cells typically retain 80% capacity after about 250–300 charge/discharge cycles. The Vapcell K25 is engineered to achieve the same 80% retention after 500+ cycles—approximately twice the lifespan. This makes it ideal for devices that are charged daily, such as work flashlights, and power tools, significantly reducing how often you need to buy replacement cells.
Q: Can I use this battery for vaping? What resistance is safe?
A: Yes, for builds drawing up to 20A continuous. With a 20A CDR at 3.6V nominal, it can safely power builds down to approximately 0.18Ω, providing a comfortable safety margin. The 35A pulse rating offers additional headroom for short draws, but continuous current must remain within the 20A limit. Always verify your actual current using Ohm's law before use.
Q: Is the 35A rating continuous?
A: No. The 35A is the maximum pulse discharge rating for short bursts of less than 10 seconds. The Continuous Discharge Rating (CDR) is 20A. Never design your system to rely on the pulse rating for sustained operation, as this will cause dangerous overheating and rapidly degrade the cell's capacity and safety.
Q: Can I use these to rebuild a power tool battery pack?
A: Yes, for light-to-medium duty tools such as impact drivers and drills. The 20A continuous rating is well-suited for these applications, and the extended 500+ cycle life means your rebuilt pack will outlast one built with standard cells. Always use matched cells (voltage and internal resistance), spot-weld nickel strips—never solder directly to the cell—and install a BMS rated for at least 30A.
Q: How should I store these cells when not in use?
A: Store at approximately 3.6–3.7V (40–50% charge) in a cool, dry place. Use non-conductive battery cases to prevent accidental short circuits. Avoid storing cells fully charged or deeply discharged for extended periods, as this accelerates capacity loss.
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
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.