Ampace JP40 21700 4000mAh 70A Tabless Battery
Key Features
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70A High Discharge: Handles extreme current draw with ease, supporting up to 70A continuous output.
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4000mAh Capacity: Delivers extended runtime for e-bikes, tool packs, and power-intensive builds.
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Fast Charging Ready: Supports 8A max charge current for reduced downtime during use.
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Long Cycle Life: Retains 60% capacity after 600 cycles at 30A, ensuring performance longevity.
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Wide Operating Range: Discharges from -30°C to 75°C, ideal for harsh environments.
The Ampace JP40 is a rugged 21700 Li-ion cell engineered for demanding energy systems. With a 70A max continuous discharge, this cell is designed to push performance boundaries while maintaining thermal stability and long-term reliability. Whether you're building an EV battery pack or a high-drain industrial system, the JP40 offers a balanced combination of power, speed, and cycle life.
Applications/Uses
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e-Bikes & e-Motorcycles: Power systems that demand high output and thermal stability.
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Power Tool Packs: Reliable energy for heavy-duty applications with short burst requirements.
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Custom Energy Systems: Great for robotics, drones, and battery banks with extreme demands.
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Outdoor Equipment: Operates in cold or hot conditions without performance compromise.
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DIY Projects: Ideal for builders seeking top-tier high-drain 21700 cells.
SPECIFICATIONS
| Manufacturer: |
Ampace |
| Model: |
JP40 |
| Size: |
21700 |
| Positive Terminal: |
Flat Top |
| Nominal Capacity: |
4000mAh |
| Continuous Discharge Rating: |
60A (No cutoff), 70A (with temp cutoff) |
| Pulse Discharge (5s): |
140A |
| Nominal Voltage: |
3.7V |
| Maximum Voltage: |
4.2V |
| Discharge Cut-Off Voltage: |
2.5V |
| Standard Charge Current: |
4A |
| Fast Charge Current: |
8A |
| Cycle Life: |
>=2400mAh after 600 cycles @ 30A |
| Operating Temperature: |
-30°C to 75°C (discharge) / 0°C to 60°C (charge) |
| Rechargeable: |
Yes |
| Approx. Dimensions: |
21.1mm x 70.1mm |
| Approx. Weight: |
68g |
| Protected: |
No, Unprotected |
| Country of Origin: |
China |
| Data Sheet: |
Ampace JP40 Datasheet |
Applications
The Reliance is widely used in high-drain electronic devices, including:
🔋 Electric Vehicles (EVs) & E-Bikes – Provides high power output and long-lasting charge cycles.
🔋 Battery Packs – Frequently used in custom-built high-performance energy storage systems.
🔋 Power Tools – Suitable for cordless drills, saws, and industrial-grade equipment.
🔋 RC Vehicles & Drones – Delivers stable and long-lasting energy output.
🔋 Flashlights & Tactical Gear – Ideal for high-performance LED torches and professional gear.
🔋 Energy Storage Systems (ESS) – Used in power banks, solar storage, and backup energy systems.
Note: Label appearance may vary between batches.
About Samsung Cell Labelling
Samsung updated the sleeve printing format for their 18650 cells in 2024 due to regulatory and certification changes. New batches will no longer display “Samsung” on the wrap, and instead show “SDI” along with updated compliance markings (such as CCC).
Older stock (pre-2024) typically features “Samsung SDI” clearly printed on the sleeve, along with the model and batch details in the previous format. This is the version most customers are familiar with.
Performance & Authenticity Verified
These changes are purely cosmetic and do not affect performance, quality, or authenticity. All cells supplied are genuine Samsung-manufactured products and have been independently tested to meet Samsung’s specifications, including internal resistance, capacity, and discharge performance.
Safety Guidelines & Warnings
⚠️ IMPORTANT SAFETY NOTICE ⚠️
Lithium-ion batteries require proper handling and knowledge to ensure safe usage.
Failure to follow safety guidelines may result in fire, explosion, serious injury, or property damage.
General Safety Guidelines
✔ Only purchase and use if you fully understand lithium-ion battery safety.
✔ Always charge in or on a fire-resistant surface—never leave batteries charging unattended.
✔ Use only a compatible smart charger designed specifically for this type of battery.
✔ Store batteries in a protective case—never carry them loose in a pocket, bag, or purse.
✔ Keep away from metal objects (keys, coins, tools) to prevent short circuits.
✔ Use only within manufacturer-listed specifications and in protected battery packs.
✔ Resellers must provide these warnings to all customers.
🚫 Prohibited Uses & Handling
⛔ DO NOT use this battery in e-cigarettes, vaporizers, or similar devices.
⛔ DO NOT mix old and new, or used and unused batteries.
⛔ DO NOT short circuit, puncture, cut, crush, incinerate, or modify the battery.
⛔ DO NOT use if the battery wrapper is torn or damaged in any way.
⛔ DO NOT overcharge or over-discharge—this can lead to battery failure.
⛔ DO NOT expose the battery to liquids, extreme heat, or direct sunlight.
⛔ DO NOT solder directly—only use spot welding for battery pack assembly.
⚠ User Responsibility & Risk Acknowledgment
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The user assumes full responsibility for proper handling, charging, and storage.
- Misuse or mishandling may result in serious injury or damage.
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No guarantee of compatibility with any specific device is provided.
- Usage of this battery is at your own risk.
By purchasing and using the AMPACE JP40 21700 Battery, you acknowledge and agree to follow all safety guidelines.
Failure to comply may result in hazardous consequences. Prior knowledge of lithium-ion battery safety is required before purchase.
Stay safe and handle responsibly. 🔋
