Compared with polymer lithium batteries and square lithium batteries, cylindrical lithium batteries have the longest development time, a higher degree of standardization, more mature technology, high yield, and low cost.
Types of cylindrical lithium-ion batteries.
Cylindrical lithium-ion batteries are usually represented by five-digit numbers. Counting from the left, the first and second digits refer to the diameter of the battery, the third and fourth digits refer to the height of the battery, and the fifth digit represents a circle. There are many types of cylindrical lithium batteries, the more common ones are 10400, 14500, 16340, 18650, 21700, 26650, 32650, etc.