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Battery Showdown: The Differences Between 18650, 26650, and 21700 Batteries

  • 2023-08-03

In the world of portable electronic devices and renewable energy storage, batteries play a crucial role. Among the various types available, 18650, 26650, and 21700 batteries stand out as some of the most popular choices. Each has its unique characteristics, advantages, and applications, making them sought after by different industries and consumers.

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1. Introduction to 18650, 26650, and 21700 Batteries

  • 18650 Batteries: The 18650 battery, named for its dimensions (18mm diameter and 65mm length), has been a staple in various devices like laptops, flashlights, and vaping devices. Its compact size and high energy density have made it a reliable power source for years.

  • 26650 Batteries: As the name suggests, the 26650 battery measures 26mm in diameter and 65mm in length. It boasts a larger capacity compared to 18650 batteries, making it suitable for high-drain devices like power tools and electric vehicles.

  • 21700 Batteries: The 21700 battery is relatively newer in the market but has gained significant traction. With a diameter of 21mm and a length of 70mm, it strikes a balance between the 18650 and 26650 batteries, offering increased capacity and power for applications such as electric bikes and high-performance flashlights.

2. Capacity and Power

When comparing these batteries, one of the key factors is their capacity, measured in milliampere-hours (mAh). The larger the capacity, the more charge the battery can store. In this regard:

  • 18650 Batteries: Typically offer a capacity range of 1800mAh to 3600mAh, making them suitable for moderate to low-power applications.

  • 26650 Batteries: Generally have a capacity range of 3000mAh to 6000mAh, providing more power for high-drain devices and longer runtimes.

  • 21700 Batteries: Offer a capacity range of 3500mAh to 5000mAh, providing a balance between the other two battery types, suitable for various applications.

3. Energy Density

Energy density is a crucial factor for portable devices as it determines how much energy a battery can store relative to its size and weight. In this aspect:

  • 18650 Batteries: Tend to have a higher energy density compared to 26650 and 21700 batteries, making them more compact and lighter for the same amount of stored energy.

  • 26650 Batteries: Offer a lower energy density compared to 18650 batteries, but their larger size allows for higher capacity and power output.

  • 21700 Batteries: Generally have a higher energy density compared to 26650 batteries but slightly lower than 18650 batteries, offering a good compromise between size and capacity.

4. Applications

The choice between these batteries depends on the specific needs of the application:

  • 18650 Batteries: Ideal for compact and lightweight devices like laptops, smartphones, and flashlights, where space is limited.

  • 26650 Batteries: Suited for high-power applications such as power tools, electric vehicles, and industrial equipment, where capacity and performance are essential.

  • 21700 Batteries: Finding their place in electric bikes, high-performance flashlights, and certain power tools, providing a balance between capacity and size.

5. Conclusion

In conclusion, the 18650, 26650, and 21700 batteries each have their unique strengths and applications. The 18650 stands out for its compact size and higher energy density, while the 26650 excels in high-capacity and power-hungry devices. The 21700 battery strikes a balance between the two, making it a versatile choice for various applications.

When selecting a battery, consider the specific needs of your device or project, as well as factors like size, capacity, power output, and energy density. By understanding these differences, you can make an informed decision and ensure optimal performance for your portable electronic devices or renewable energy storage systems.

Chongqing Melidy is a 19 years battery manufacturer,PXE is our brand. After more than 10 years development and growth, our has formed a set of product development, manufacturing and sales in new energy area. Our products are sold to 178 countries in Europe,America, and Australia etc. We have got European CE, FCC,Rohs, UL and other certifications. We have successfully cooperated with many brands and customized ODM or OEM.

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