18650 is the originator of lithium-ion battery -- a standard lithium-ion battery model set by SONY of Japan in order to save costs at that time. 18 means 18mm in diameter, 65 means 65mm in length, and 0 means cylindrical battery.

18650 battery life theory for 1000 cycles of charge. As the density of the unit capacity is very big, so most of the laptop battery, in addition, in 18650 at work stable performance is very good, is widely used in the electronics field: commonly used in high-grade light flashlight, portable power, wireless data transmission, electric thermal clothing, shoes and portable instruments and meters, portable lighting, portable printer, Industrial instruments, medical instruments, etc.