26650 lithium battery and 18650 lithium batteries are two common types of lithium ion batteries, which have some differences in size, capacity, power and application. The following will introduce the differences between 26650 lithium batteries and 18650 lithium batteries in detail in order to better understand their characteristics and applicability.

1. Size
   the most obvious difference lies in size. The diameter of 26650 lithium batteries is about 26mm and the length is about 65mm, while the diameter of 18650 lithium batteries is about 18mm and the length is about 65mm. Therefore, 26650 lithium batteries are larger than 18650 lithium batteries and contain more electrolyte and electrode materials, thus providing higher battery capacity and power output.

2. Capacity
   due to its large size, 26650 lithium batteries usually have higher battery capacity. Generally speaking, the capacity of 26650 lithium batteries is between 3000mAh and 6000mAh, while the capacity of 18650 lithium batteries is generally between 2000mAh and 3500mAh. Therefore, if longer battery life is required, it may be more appropriate to choose 26650 lithium batteries.

3. Power output
   due to the larger capacity, 26650 lithium batteries can usually provide higher power output. In applications requiring higher power output, such as electric tools, unmanned aerial vehicles, etc., choosing 26650 lithium batteries may provide better performance and durable and stable power supply.

4. Cycle Life
   due to the larger capacity, 26650 lithium batteries generally have a longer cycle life. Under the same cycle charge and discharge times, the life of 26650 lithium batteries may be longer than that of 18650 lithium batteries, which is suitable for long-term stable use.

5. Application Field
   according to its size, capacity and power characteristics, 26650 lithium batteries are commonly used in applications with high current output and long endurance, such as electric vehicles, solar energy storage system, emergency lighting and other fields. However, 18650 lithium batteries are widely used in portable electronic products, notebook computers, electric tools and other fields.

   26650 lithium battery and 18650 lithium battery have obvious differences in size, capacity, power output, cycle life and application fields. Selecting the appropriate battery type depends on the specific application requirements and usage scenarios to ensure that the battery can meet the requirements and maintain stable performance.