21700 battery is designed for high-energy and high-power applications such as electric vehicles, energy storage systems, and advanced industrial equipment.
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The term 21700 describes a standardized cylindrical lithium battery format: 21 = 21 mm diameter, 70 = 70 mm height, 0 = cylindrical shape. Compared to 18650 cells, the 21700 format offers a larger internal volume, enabling higher capacity, improved thermal behavior, and enhanced power output within fewer cells.
The 21700 lithium-ion battery cell offers several distinct advantages over older formats like the 18650, primarily due to its optimized physical dimensions. They are 50% more volume than 18650 battery, they simplify the Battery Management System (BMS) and reduces the complexity of the internal wiring and structural components.
21700 batteries are widely used in high-performance battery packs for electric vehicles, energy storage systems (ESS), power tools, autonomous equipment, robotics, and industrial power solutions. Their higher capacity per cell allows designers to achieve greater energy output, longer runtime, or reduced pack weight while maintaining safety and reliability.
We offer custom 21700 battery pack solutions built around real application requirements, including:
Custom voltage, capacity, and discharge configurations
Cell selection optimized for energy, power, or long cycle life
Integrated BMS with protection, balancing, and communication options
Mechanical and thermal design tailored to installation environments
OEM / ODM support from prototyping to mass production
Our application-driven customization ensures each 21700 battery pack delivers optimal performance, safety, and longevity in demanding use cases.
