18650 is a standard lithium-ion battery model established by SONY Company in Japan to save costs. Among them, 18 represents a diameter of 18mm, 65 represents a length of 65mm, and 0 represents a cylindrical battery.
18650 lithium battery
The service life of 18650 lithium batteries is very long, with a cycle life of over 500 times during normal use. Generally, they can last for at least two years, which is more than twice that of regular batteries.
18650 Lithium Battery Classification
The common 18650 batteries are divided into lithium-ion batteries and lithium iron phosphate batteries. The nominal voltage of lithium-ion batteries is 7v, the charging cutoff voltage is 2v, and the nominal voltage of lithium iron phosphate batteries is 2v, the discharge cutoff voltage is 6v. The capacity is usually 1200mAh -3350mAh, and the common capacity is 2200mAh -2600mAh.
Lithium batteries are batteries with metal lithium as the negative electrode, also known as lithium metal batteries. It is worth noting that lithium batteries are divided into primary and secondary batteries based on their configuration. Early lithium batteries were primary batteries, but due to the highly reactive chemical properties of metallic lithium, their processing, storage, and use had high environmental requirements. So, lithium batteries were not widely used after their invention. With the development of microelectronics technology at the end of the 20th century, the number of miniaturized devices is increasing, posing higher requirements for power supplies. Lithium batteries have subsequently entered a large-scale practical stage. The most common lithium battery structure among consumers currently uses metallic lithium as the negative electrode, manganese dioxide as the positive electrode, and lithium salts dissolved in organic solvents as the electrolyte.