In the world of portable electronic devices, the demand for batteries that are both high-capacity and long-lasting has reached an all-time high. This is where the innovative 21700 battery comes into play, as it has completely transformed the industry. Our blog post will provide an in-depth analysis of 21700 batteries, detailing their specifications, applications, benefits, and why they are widely considered to be the ultimate power solution due to their versatility.

What is a 21700 battery?

A 21700 battery is a type of rechargeable lithium-ion battery that is cylindrical in shape and has dimensions of 21mm in diameter and 70mm in length. It is named “21700” based on its size, where “21” represents the diameter in millimeters, and “700” represents the length in millimeters.

Understanding 21700 Batteries

The popularity of 21700 batteries has increased considerably in recent years, thanks to their exceptional power and versatility. This section aims to elaborate on the crucial aspects of comprehending these batteries, thereby providing a more comprehensive insight into their benefits and inner workings.

Size and Structure of 21700 Batteries

  • 21700 batteries have a cylindrical shape with a diameter of 21mm and a length of 70mm.
  • Their larger size than previous standard batteries, like the 18650, allows for increased capacity and improved performance.

Chemistry of 21700 Batteries

Two common chemistries are used in 21700 batteries: lithium nickel manganese cobalt oxide (NMC) and lithium iron phosphate (LiFePO4).

  • NMC batteries offer a higher energy density, delivering increased capacity and longer runtime. They are commonly used in consumer electronics.
  • LiFePO4 batteries provide enhanced safety features, stable performance, and a longer lifespan. They are often utilized in power tools and electric vehicles.

Capacity and Energy Density

  • 21700 batteries offer higher capacity than their predecessors, providing more power for longer durations.
  • Their larger size allows for improved energy density, enabling devices to operate at higher power levels and reducing the need for frequent recharges.

Power Output

  • 21700 batteries are known for delivering high current output, making them suitable for devices that require bursts of power or sustained high-power usage.
  • This feature particularly benefits power tools, electric vehicles, and other high-performance applications.

Safety Features

  • Manufacturers have implemented advanced safety measures in 21700 batteries to mitigate potential risks.
  • These safety features include protection against overcharging, over-discharging, short circuits, and thermal runaway, enhancing the overall reliability of the batteries.


  • Electric Vehicles (EVs): The high energy density and capacity of 21700 batteries make them a preferred choice for EV manufacturers, providing longer driving ranges and improved performance.
  • Consumer Electronics: Smartphones, laptops, tablets, and other portable devices benefit from the extended runtime and high power output of 21700 batteries, ensuring longer usage between charges.
  • Power Tools: Cordless power tools rely on the high current output and capacity of 21700 batteries, enabling professionals to work efficiently without the constraints of cords or frequent battery replacements.
  • Energy Storage: 21700 batteries are utilized in renewable energy storage systems, such as solar and wind power applications, to store excess energy and provide a stable power supply during low production periods.

By delving into the expanded understanding of 21700 batteries, it becomes evident that their larger size, increased capacity, enhanced power output, and versatile applications make them a preferred choice for various industries and consumer devices. As technology continues to advance, these batteries will likely play a crucial role in powering our increasingly portable and energy-efficient world.

Author: cindy


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