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18650 | 21700 | 26650 What are these Numbers??

Posted on May 24 2024

18650 | 21700 | 26650 What are these Numbers??

Cylindrical Cells


Cylindrical lithium-ion cells are renowned for their balance of energy density, durability, and versatility, making them a staple in various applications ranging from consumer electronics to electric vehicles. Our collection of cylindrical cells includes the popular 18650, 21700, and 26650 models, each offering unique benefits tailored to different power requirements and usage scenarios.


 18650 Cells:

- Description: The 18650 cell, with dimensions of 18mm in diameter and 65mm in length, is one of the most widely used lithium-ion batteries. Known for its high energy density and reliability, it is a favorite in laptops, power banks, and electric bikes.

- Key Features:

  - Typical Capacity: 2500mAh to 3500mAh

  - Continuous Discharge Rate: Up to 30A

  - Ideal for compact devices requiring robust power output

  - Excellent balance of capacity and discharge rate


 21700 Cells:

- Description: The 21700 cell, measuring 21mm in diameter and 70mm in length, offers a larger capacity and higher power output compared to the 18650. It is increasingly popular in electric vehicles, power tools, and high-performance flashlights due to its enhanced efficiency and longevity.

- Key Features:

  - Typical Capacity: 4000mAh to 5000mAh

  - Continuous Discharge Rate: Up to 45A

  - Optimal for high-drain applications requiring extended runtimes

  - Improved energy density and thermal management


 26650 Cells:

- Description: The 26650 cell, with dimensions of 26mm in diameter and 65mm in length, is known for its robust capacity and durability. This cell is ideal for applications requiring sustained high power and longer operational periods, such as in industrial equipment, large flashlights, and electric vehicles.

- Key Features:

  - Typical Capacity: 5000mAh to 6000mAh

  - Continuous Discharge Rate: Up to 30A

  - Perfect for high-capacity applications with moderate to high power demands

  - Superior cycle life and stability



Consumer Electronics: 18650 and 21700 cells are compact and high-energy dense, making them ideal for laptops, tablets, power banks, and portable devices.

- Electric Vehicles (EVs): Both 21700 and 26650 cells are extensively used in EV battery packs for their high capacity, power output, and efficiency.

- Power Tools: 21700 cells provide high discharge rates and capacity for demanding power tools, ensuring prolonged and reliable performance.

- Flashlights and Emergency Equipment: 26650 cells are preferred for high-powered and emergency lighting systems, offering long-lasting power and durability.

- Industrial Applications: Robust and reliable, all three cell types support various industrial applications, from robotics to renewable energy storage systems.



- High Energy Density: Maximizes power storage within a compact size, ensuring long-lasting performance.

- Durability: Built to withstand rigorous usage and environmental conditions, providing reliable power over many charge cycles.

- Versatility: Suitable for various applications, from small electronics to large-scale industrial equipment.

- Safety Features: Integrated safeguards protect against overcharging, overheating, and short-circuiting, enhancing overall safety and battery longevity.


Our collection of cylindrical cells ensures that you have the correct battery solution for your specific needs, whether you require the compact power of an 18650, the enhanced capacity of a 21700, or the robust durability of a 26650. Choose from our selection to power your devices with confidence and reliability.

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