For product inquiries, support questions, or any other issues, please fill out the form below and a member of our team will get back to you within one business day.
Product Display
21700 cylindrical cells have become a cornerstone of modern power systems due to their excellent energy density, long cycle life, and wide application versatility. As a trusted 21700 battery manufacturer and supplier, JOINSUN offers premium INR21700 lithium-ion cells engineered for high performance, reliability, and safety in demanding applications worldwide.
As a leading 21700 battery manufacturer, JOINSUN combines advanced production capabilities with rigorous quality control to deliver high-efficiency cylindrical cells. Our state-of-the-art manufacturing facilities include automated coating lines, precision injection equipment, and integrated welding systems — enabling scalable production of reliable 21700 cylindrical lithium-ion cells for global markets.
Offering both standard and customized 21700 cells, JOINSUN supports OEM and large-volume suppliers with tailored solutions, including specific capacities, discharge rates, and performance characteristics to match diverse industrial and consumer requirements.
JOINSUN is more than just a battery supplier; we are a trusted partner in energy storage solutions. With over 30 R&D experts and 24 related patents, JOINSUN specializes in delivering high-performance 21700 cylindrical lithium-ion batteries that exceed industry standards. Our extensive manufacturing capacity includes advanced coating production lines, automated injection lines, and integrated welding production lines, enabling us to provide customized, high-quality solutions to meet your specific power needs.
Warranty Policy: Providing a warranty and replacement service within a certain period to ensure customer satisfaction.
Attention: Please use and charge the product correctly according to the product manual to avoid improper operations such as overcharging, over-discharging, short circuits, etc.
| JoinsunSeries | Model | Code | Nominal Capacity (mAh) | Maximum Capacity (mAh) | Internal Resistance (mΩ) | Cycle Life(Capacity Retention Rate> 80%) | Continuous Rate (Ambient Temperature: 25℃) | Maximum Multiplier (Not Supported) |
| HighRateSeries | INR21700-40 | 40P | 4000 | 3900 (2.5V) | ≤22 | 3C circulation≥2500 cycles | +1C/-3-5C | 8C |
| INR21700-45 | 45P | 4500 | 4400 (2.5V) | ≤22 | 3C circulation≥ 1500 cycles | +1C/-3-5C | 8C | |
| DriveSeries | NR21700-40 | 40D | 4000 | 3900 (2.75V) | ≤22 | 3C circulation≥800 cycles | +0.5C/-3C | 5C |
| NR21700-45 | 450 | 4500 | 4400 (2.75V) | ≤22 | 3C circulation≥ 800 cycles | +0.5C/-3C | 5C | |
| INR21700-48 | 48D | 4800 | 4700 (2.5V) | ≤22 | 3C circulation≥ 800 cycles | +0.5C/-3C | 5C | |
| INR21700-50 | 50D | 5000 | 4900 (2.5V) | ≤22 | 2C circulation≥ 400 cycles | +0.5C/-3C | 5C | |
| 3C Series | NR21700-40 | 40C | 4000 | 3900 (2.75V) | ≤22 | 2C circulation≥ 400 cycles | +0.5C/-2C | 4C |
| NR21700-45 | 45C | 4500 | 4400 (2.75V) | ≤22 | 2C circulation≥400 cycles | +0.5C/-2C | 4C | |
| INR21700-48 | 48C | 4800 | 4700 (2.5V) | ≤22 | 2C circulation≥400 cycles | +0.5C/-2C | 4C | |
| NR21700-50 | 50C | 5000 | 4900 (2.5V) | ≤22 | 3C circulation≥400 cycles | +0.5C/-2C | 4C | |
| StorageSeries | NR21700-40 | 40E | 4000 | 3900 (2.5V) | ≤22 | 3C circulation≥ 600 cycles | +05~1C/-2~3C | 5C |
| INR21700-45 | 45E | 4500 | 4400 (2.5V) | ≤22 | 3C circulation≥ 600 cycles | +0.5-1C/-2-3C | 5C | |
| INR21700-48 | 48E | 4800 | 4700 (2.5V) | ≤22 | 3C circulation≥ 600 cycles | +0.5~1C/-2~3C | 5C | |
| INR21700-50 | 50E | 5000 | 4900 (2.5V) | ≤22 | 3C circulation≥ 600 cycles | +05~1C/-2~3C | 5C |
As a 21700 Battery Manufacturer, we prioritize quality, performance, and safety. Our 21700 cylindrical cells come with the following standout features:
1. Capacity: 4000mAh-5500mAH capacity to meet the diversified needs of different devices
2. Voltage: The standard voltage is 3.6V, providing stable power.
3. Charging speed: Fast charging available, with a maximum rate of up to 15C (21700-40T), greatly reducing the required charging time.
4. Cycle life: After rigorous cycle testing, the long cycle life could reach over 300 cycles, far exceeding the lifespan of ordinary batteries.
5. Safety protection: Equipped with multiple safety protection circuits, including overcharge, over-discharge, overheat, and short circuit protection, ensuring safe usage.
6. Stylish Design: Features a steel shell with excellent wear resistance and a stylish appearance.
7. Environmental protection materials: Free of environmentally harmful elements such as cadmium, lead, and mercury, compliant with European RoHS regulations, ensuring a green and eco-friendly battery.
8. Lightweight and Portable: small size, light weight, easy to carry and use.
9. Versatile Compatibility: Wide device compatibility, suitable for various electronic devices and new energy applications.
Our 21700 cylindrical cells offer several benefits over traditional lithium-ion batteries, including:
· High Energy Density: With up to 20% more energy density compared to 18650 batteries, 21700 cells provide longer runtime and lighter weight, ensuring optimal power delivery.
· Longer Cycle Life: Our 21700 cylindrical lithium-ion batteries provide superior cycle performance, offering longevity and better value for money.
· Low Self-Discharge: The 21700 cells retain charge for longer periods, making them an ideal choice for long-term storage.
· Wide Temperature Range: These cells operate efficiently within a temperature range of -20°C to 80°C, suitable for various environmental conditions.
· No Memory Effect: The 21700 cylindrical cells can be charged at any time without affecting their performance, offering more convenience for users.
As a versatile 21700 battery supplier, JOINSUN’s cylindrical cells support a broad range of industries, including:
· Electric Vehicles: Powering e-bikes, scooters, and other light EV platforms.
· Energy Storage Systems (ESS): Robust performance for outdoor energy storage and portable power stations.
· Power Tools: High-rate discharge capabilities for cordless tools and equipment.
· Consumer Electronics & Toys: Reliable power sources for high-drain devices and gadgets.
As an established 21700 cylindrical cells manufacturer and trusted battery supplier:
· OEM/ODM Support: JOINSUN provides tailored solutions and battery configurations to meet specific design and performance needs.
· Quality Assurance: Strict production and testing protocols ensure consistent performance across all supplied 21700 cells.
· Professional Service: From pre-sale consultation to after-sales technical support, JOINSUN delivers comprehensive service to clients worldwide.
Whether you’re an OEM seeking customized 21700 cells, a distributor sourcing high-quality cylindrical batteries, or an integrator designing next-generation power systems, JOINSUN is your reliable 21700 battery manufacturer & supplier ready to support your project.
Clients
Certificates
Applications
Unlock the Power of 18650 Battery Cells in Your E-Bike!
Experience the ultimate performance with 18650 battery cells in your electric-assist bicycle. These cutting-edge cells provide a steady power supply to your bike's motor, delivering seamless assistance during your rides.
Healthcare Equipment with 18650 Battery Cells
In the realm of medical devices, 18650 battery cells play a crucial role. These cells are the go-to power source for portable medical equipment, offering a reliable power solution that is ideal for various applications.
The 18650 Lithium-Ion Battery Cell Plays a Crucial Role in the World of Portable Power Banks
The 18650 lithium-ion battery cell plays a crucial role in the world of portable power banks, offering the perfect balance of power and efficiency. With its ideal energy density, it ensures your devices stay charged longer, wherever you go.
The 21700 Battery Cell Has Found Widespread Application in High-Performance Flashlights
The 21700 battery cell has found widespread application in high-performance flashlights, becoming a go-to choice for enthusiasts and professionals alike. With its superior energy density, the 21700 cell delivers ample power to keep flashlights running lon
The 21700 battery cell brings a host of advantages to the electric bicycle and electric motorcycle industries. In terms of power delivery, the 21700 cell provides robust support for vehicle performance. Electric bicycles and motorcycles require rapid burs
The 21700 Battery Cell Plays a Critical Role in Outdoor Power Banks
The 21700 battery cell plays a critical role in outdoor power banks, delivering superior performance and reliability. With its high energy density, it allows outdoor power banks to store significant amounts of energy in a compact form factor.
News
Company News
2026.01.04
Company News
2025.12.30
Company News
2025.12.22
Company News
2025.12.02
Company News
2025.11.25
Company News
2025.11.19
Please Feel Free to Contact Us if You Have any Questions
For product inquiries, support questions, or any other issues, please fill out the form below and a member of our team will get back to you within one business day.