What is the difference between 18650 lithium and other lithium batteries?

1. What is the difference between 18650 lithium and other lithium batteries? What is the difference between 18650 lithium and other lithium batteries? This may be a problem that most of people are concerned about . And why 18650 battery is smiliar shape with other lithium battery but big difference in power? 18650 battery power can up to 8watts, but other can 5th battery just watts? First, 18650 Lithium battery is a kind of lithium battery (cylindrical), a code of the battery specification .This .This specification also must popular in the market now . 18mm is the diameter, 65mm is height . Compared with 5th/ 7th battery, they are just different in raw material we differences. 8 watts = 3.7V * 2200mah. Now the market generally can produce 18650 2200MAH, few of manufacturer can produce 2600- 2800MAH. Foreign manufacturer also can produce 3500MAH, but 3000mah is widely used. As for big discharge battery, generally 15C discharge can be done, some even can reach 30C. This type of battery is generally used in power tools, such as electric spark which demands for cars and other large appliances. Second, as lithium battery, 18650 battery have higher discharge platform than nimh, so its capacity of nickel metal hydride higher than 5th battery, Of course, when it comes to power, li-ion battery higher voltage, discharge current can also be bigger. Difference in material inside, big difference in energy. Source: http://www.facolo.com/blog/What-is-the-difference-between-18650-lithium- and-other-lithium-batteries/