Cylindrical 3.7V Li-ion Battery
High-performance cylindrical lithium-ion batteries designed for maximum energy density, exceptional cycle life, and reliable power output across diverse applications.
Multiple Models
Available in 18650, 21700, 26650, and 32650 sizes to fit your specific application requirements.
Discharge Rates
Choose from various discharge capabilities (1C/3C/5C) based on your power output needs.
Ready to Ship
Ample inventory available for immediate dispatch, with customization options for protection circuits and parallel configurations.
Complete Series of Cylindrical Li-ion Batteries
Explore our comprehensive range of high-performance cylindrical lithium-ion batteries designed for various applications and power requirements.
18650 Series
Standard 18mm × 65mm cylindrical cells with capacities ranging from 2000mAh to 3500mAh. Perfect for portable electronics and light power tools.
21700 Series
Higher capacity 21mm × 70mm cells offering 4000mAh to 5000mAh. Ideal for high-drain devices, EVs, and energy storage systems.
26650 Series
Larger 26mm × 65mm cells with capacities from 4000mAh to 5500mAh. Excellent for high-power applications requiring extended runtime.
32650 Series
Our largest 32mm × 65mm cells delivering 5000mAh to 7000mAh. Designed for heavy-duty applications and energy storage solutions.
Why Choose Our Cylindrical Li-ion Batteries
We offer industry-leading cylindrical batteries with superior performance, reliability, and customization options to meet your specific requirements.
Multiple Model Options
Choose from our extensive range of cylindrical batteries including 18650, 21700, 26650, and 32650 series to perfectly match your device requirements.
Various Discharge Capabilities
Our batteries offer different discharge rates (1C/3C/5C) to accommodate various power demands from low-drain electronics to high-performance applications.
International & Domestic Brands
We partner with leading global and domestic battery manufacturers to provide you with a wide selection of trusted brands at competitive prices.
Ample Stock & Fast Shipping
With our extensive inventory management system, we maintain sufficient stock levels to ensure quick order processing and prompt delivery to meet your project timelines.
Customization Options
We offer protection circuit integration and parallel capacity expansion solutions to tailor our batteries to your specific application requirements.
Quality Assurance
Every battery undergoes rigorous testing and quality control procedures to ensure safety, reliability, and consistent performance in your applications.
Product Specifications
Comprehensive technical details of our cylindrical Li-ion batteries to help you select the perfect power solution for your application.
Capacity Specifications
| Model | Nominal Capacity | Nominal Voltage | Max Charging Voltage | Cut-off Voltage | Weight |
|---|---|---|---|---|---|
| 18650 | 1500-3500mAh | 3.7V | 4.2V | 2.75V | 45-49g |
| 21700 | 4000-5000mAh | 3.7V | 4.2V | 2.75V | 68-72g |
| 26650 | 4500-5500mAh | 3.7V | 4.2V | 2.75V | 85-90g |
| 32650 | 6000-7000mAh | 3.7V | 4.2V | 2.75V | 145-155g |
Discharge Performance Parameters
Standard Discharge
- Standard discharge current: 0.2C
- Maximum continuous discharge: 1C-5C (model dependent)
- Operating temperature: -20°C to 60°C
- Cycle life: >500 cycles (80% capacity retention)
High-Rate Discharge
- High-rate discharge models available: 3C, 5C, 10C
- Pulse discharge capability: Up to 15C (5 seconds)
- Internal resistance: ≤30mΩ (model dependent)
- Temperature rise during discharge: <15°C at max rate
Charge/Discharge Curve
Charging Curve
Standard CC-CV charging profile at 0.5C rate, showing voltage and current curves over time until full charge.
Discharging Curve
Discharge voltage profiles at different rates (0.2C, 1C, 3C) showing capacity retention and voltage stability.