18650 is not just a series of numbers, but also a standard for battery energy sessions.
The 18650 is a standard type lithium ion battery set by the originator of the Japanese SONY company in order to save cost. It means 18 represents a diameter of 18mm, 65mm length, and 0 is of cylindrical battery. The common 18650 Battery is divided into lithium ion batteries and lithium iron phosphate batteries. The lithium ion battery voltage is 3.6V or 4.2V, while the LiFePO4 Battery voltage is 3.2V, the capacity is usually 1200mAh-3000mAh, and the common capacity is 2200mAh-2600mAh.
Since then, 18650 has also become a battery industry standards and continued, which has been followed by the industry. Of course, in order to meet the needs of various purposes, the Lithium Battery family has developed a variety of specifications.
