4-Pack Ampace JP40 21700 4000mAh 60A Tabless Flat Top Battery – High Drain for E-Bike, Power Tools, Flashlights
Description
Description
Unlock relentless power with the Ampace JP40, a tabless 21700 cell engineered for extreme high-drain applications. This 4-pack delivers a robust 45A continuous discharge (with 60A capability under active cooling) and a staggering 120A pulse output, all while maintaining 4000mAh capacity. Designed for high-performance e-bike battery packs, heavy-duty cordless tools, competition , and FET-driven flashlights, the JP40 utilizes tabless technology to achieve ultra-low internal resistance (~6mΩ), virtually eliminating voltage sag under the heaviest loads. The flat top design ensures compatibility with spring-contact devices and simplifies spot-welding for custom battery builds. When your device demands maximum current without compromise, the Ampace JP40 delivers.
Key Features
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45A Continuous / 60A with Cooling / 120A Pulse – Massive current headroom for the most demanding applications. Handles e-bike motor surges, angle grinder start-ups, and super-sub-ohm builds with ease.
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4000mAh Balanced Capacity – Optimized for high-drain use. Provides significantly longer runtime than typical 3000–3500mAh high-power cells while maintaining extreme current output.
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Tabless (All-Tab) Technology – Reduces internal resistance to ~6mΩ. Minimizes heat build-up, maximizes power delivery, and ensures rock-steady voltage under extreme loads.
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Flat Top Design – Universally compatible with 21700 spring-contact chargers, battery trays, and flashlights. Ideal for spot-welding nickel strips in custom high-current battery packs.
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4-Pack Convenience – Perfect for building a compact high-current pack, equipping dual-battery mods, or powering a set of heavy-duty tools.
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Ampace Quality & Safety – Built with rigorous testing and safety mechanisms including pressure relief vents. Consistent A-grade cell performance trusted by professionals.
Parameters
| Parameter | Specification |
|---|---|
| Model | Ampace JP40 (21700) |
| Technology | Tabless (All-Tab) |
| Typical Capacity | 4000 mAh (0.2C discharge to 2.5V) |
| Minimum Capacity | ~3900 mAh |
| Nominal Voltage | 3.6 V (typical operating 3.7 V) |
| Max Continuous Discharge | 45 A (cell temperature ≤ 80°C; up to 60 A with active cooling) |
| Max Pulse Discharge | 120 A (short burst <5 sec, monitor temperature) |
| Discharge Cut-off Voltage | 2.5 V (do not over-discharge) |
| Standard Charge | CC-CV, 0.5C (2000 mA) to 4.2 V, cut-off 50 mA |
| Max Charge Current | 1C (4000 mA); fast charge above 1C requires temperature monitoring |
| Internal Resistance | ≤ 8 mΩ (typical ~6 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 active cooling for sustained high current) |
| Top Type | Flat Top |
| Dimensions | Approx. |
| 21.2 mm diameter × 70.3 mm length | Weight (single cell) | Approx. |
| 68 g | Package Includes | 4 × Ampace JP40 21700 cells in protective packaging |
Applications
Recommended For
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High-Performance E-Bikes & E-Scooters: Build compact, high-power battery packs (e.g., 10S1P or 10S2P) for rapid acceleration and hill climbing. Always use a BMS rated for at least 80A.
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Heavy-Duty Cordless Power Tools: Angle grinders, circular saws, rotary hammers, and chain saws that require sustained high current without voltage sag.
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Competition Vaping: Super-sub-ohm mechanical mods and high-wattage regulated devices (builds down to ~0.06Ω) benefit from the massive current capability and near-zero voltage drop.
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Extreme-Output Flashlights: FET-driven hot-rod lights and multi-emitter searchlights that demand 30–50A on turbo can sustain full brightness with this cell.
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RC Cars, Boats & FPV Drones: Instantaneous 100A+ bursts for explosive starts and acrobatic maneuvers.
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Portable Spot Welders & High-Power Inverters: Multi-cell configurations deliver immense short-circuit currents for demanding DIY projects.
Not Recommended For
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Low-Power Long-Runtime Devices: Solar lights, wireless sensors, and doorbells. The JP40 is severe overkill; use a high-capacity 10A cell like the Samsung 50G or EVE 58E.
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18650-Only Devices: This is a 21700 cell (21mm x 70mm) and will not physically fit.
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Standard USB Power Banks: The extreme performance is wasted in low-current applications.
FAQ
Q: What is the true continuous discharge — 45A or 60A?
A: The official Ampace continuous rating is 45A. However, with adequate active cooling (e.g., forced air or good pack ventilation), the cell can safely deliver 60A continuous. For maximum cycle life and safety, we recommend designing your system to operate at 45A continuous, with 60A reserved for shorter high-demand scenarios. The pulse rating remains 120A.
Q: Can I use this battery for vaping? What resistance is safe?
A: Yes, the JP40 is an excellent choice for extreme sub-ohm vaping. With 45A continuous and 120A pulse at 3.6V nominal, it can safely power builds down to approximately 0.06Ω. Always use Ohm's law to calculate your actual current draw and never exceed the pulse rating for more than a few seconds.
Q: What does tabless technology mean for performance?
A: Tabless cells eliminate traditional thin metal tabs connecting internal electrode layers. Instead, the entire electrode edge connects directly to the terminal. This dramatically lowers internal resistance (~6mΩ), reduces heat generation, and allows for much higher current delivery with minimal voltage sag — critical for e-bike acceleration and power tool torque.
Q: Is this battery protected?
A: No, the JP40 is an unprotected flat top cell, standard for high-drain applications. For multi-cell packs, you must install an external BMS rated for at least 80A.
Q: How should I store these cells when not in use?
A: Store at 3.6–3.7V (approximately 40–50% charge) in a cool, dry place using non-conductive battery cases. Avoid storing 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
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.