2-Pack Lishen 2000mAh 20A High Drain 18650 Flat Top Battery – for High-Output Flashlights, Power Tools & RC
Description
Short Description
Get reliable high-current power with the Lishen 2000mAh 20A high-drain 18650 flat top battery. This 2-pack is engineered for devices that demand serious current: sub-ohm mods, direct-drive tactical flashlights, cordless power tools, and RC models. The 20A continuous discharge rating ensures stable voltage under heavy load, while the flat top design fits all standard spring-contact devices and simplifies spot-welding for custom packs. Manufactured by Lishen, a respected lithium-ion producer, these cells deliver consistent, safe high-drain performance at an excellent value. When your device needs amps, not just capacity, this is the cell to trust.
Key Features
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20A Continuous High Drain – Delivers stable, high-current output for demanding devices. Handles sub-ohm vaping, FET-driven flashlights, and power tool motor surges without dangerous voltage sag.
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2000mAh Optimized Capacity – Designed for high-drain applications where current capability is the priority. Provides sufficient runtime for power-hungry devices while maintaining a true 20A rating.
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Low Internal Resistance (≤25mΩ) – Minimizes heat generation and energy loss under load, keeping your device cooler and ensuring maximum power reaches your coils or emitters.
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Flat Top Design – Compatible with all standard 18650 spring-contact chargers, flashlights, and battery trays. The flat positive terminal provides a clean surface for spot-welding nickel strips.
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Lishen Quality – Produced by a major lithium-ion manufacturer known for reliable, consistent cells used in industrial and consumer applications worldwide.
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2-Pack Value – Perfect for single-cell mechanical mods, dual-battery regulated devices, or keeping a charged spare ready for your high-drain flashlight or tool.
Parameters
| Parameter | Specification |
|---|---|
| Brand / Model | Lishen 18650 LA 2000 20A |
| Typical Capacity | 2000 mAh (0.2C discharge to 2.5V) |
| Minimum Capacity | Approx. 1900 mAh |
| Nominal Voltage | 3.6 V (typical operating 3.7 V) |
| Max Continuous Discharge | 20 A (cell temperature ≤ 80°C) |
| Max Pulse Discharge | Up to 25–30 A (short burst, monitor temperature) |
| Discharge Cut-off Voltage | 2.5 V (do not over-discharge) |
| Standard Charge | CC-CV, 0.5C (1000 mA) to 4.2 V, cut-off 50 mA |
| Max Charge Current | 1C (2000 mA); fast charge above 1C requires temperature monitoring |
| Internal Resistance | ≤ 25 mΩ (AC 1 kHz) |
| Cycle Life | ≥ 250 cycles (to 80% capacity, 1C charge / 10A discharge) |
| Operating Temperature (Discharge) | -20°C to 60°C (ensure proper cooling for sustained 20A) |
| Top Type | Flat Top |
| Dimensions | Approx. 18.4 mm diameter × 65.0 mm length |
| Weight (single cell) | Approx. 45 g |
| Package Includes | 2 × Lishen 2000mAh 20A high-drain 18650 flat top cells in protective packaging |
Applications
Recommended For
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High-Power Vaping: Mechanical mods and regulated devices running sub-ohm builds (down to approximately 0.2Ω). The 20A rating provides safe, sag-free power for demanding coils.
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High-Output Tactical Flashlights: FET-driven or direct-drive hot-rod lights, multi-emitter custom builds that need sustained current up to 20A for maximum turbo brightness.
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Cordless Power Tools: Impact drivers, drills, and light-to-medium duty wrenches when used in properly engineered battery packs with an external BMS.
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RC Cars, Boats & Airsoft: High-torque motors and rapid-fire AEGs that demand instant current bursts without hesitation.
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DIY High-Current Projects: Spot welder battery packs, portable jump starters, or any application where high discharge rate is critical.
Not Recommended For
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Standard Headlamps & Low-Power Flashlights: These devices typically draw under 3A. A 3500mAh 10A cell will provide over 70% longer runtime and is a far better fit.
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Solar Lights, Sensors & Low-Drain Electronics: The 20A capability is completely wasted, and the 2000mAh capacity severely limits runtime compared to high-capacity alternatives.
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Standard USB Power Banks: Discharge rating is overkill, and the low capacity offers poor value for energy storage.
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Long-Range E-Bike or High-Capacity Battery Packs: Per-cell capacity is too low for practical range; use higher-capacity cells or 21700 format batteries.
FAQ
Q: Can I use this battery for vaping? What is the lowest safe resistance?
A: Yes, this cell is designed for high-power vaping. At 20A continuous and 3.6V nominal, it safely powers builds down to approximately 0.19Ω, leaving a safety margin. Always calculate your actual current using Ohm's law and never exceed 20A.
Q: Why is the capacity only 2000mAh? I see higher capacity 18650s available.
A: High-drain cells prioritize current delivery over capacity. To safely output 20A with low internal resistance, the design trades some capacity. If your device draws under 10A, a 3500mAh cell will give much longer runtime. For high-current devices, consistent voltage under load is what matters most.
Q: Can I use these in a regular headlamp or standard flashlight?
A: They will physically fit and work, but we strongly advise against it. A standard headlamp drawing 1-2A will see no performance benefit from the 20A rating, while the 2000mAh capacity means you will be recharging nearly twice as often compared to a 3500mAh cell.
Q: Is this a protected battery?
A: No, this is an unprotected flat top cell, standard for high-drain applications. Your device must have its own protection circuit. For multi-cell packs, always install an external BMS rated for at least 30A.
Q: How should I store and maintain these cells?
A: Store at 3.6–3.7V (approximately 40% state of charge) in a cool, dry place. Use non-conductive battery cases to prevent short circuits. Allow cells to cool to room temperature after heavy use before recharging. Never store fully charged or deeply discharged for extended periods.
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
2000mAh, 3.7V, flat top. No exaggerated claims. They fit my headlamp and last a typical work shift. I prefer honesty over fake 5000mAh labels. Will repurchase.
My son's RC car battery pack uses these. They have enough punch for indoor play. After many cycles they still balance well. An affordable way to keep toys running.
I use these in breadboard projects with TP4056 chargers. The capacity is safe for testing and the flat top makes wiring easy. Don't over-discharge and they last.
My old Ultrafire light needed new batteries. These 2000mAh flat tops brought it back to life. Nothing extraordinary, but they do the job without issue.
Bought these for my portable lantern. They don't last as long as my 3500mAh, but they charge faster. For the price, I can keep multiple sets ready.
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.