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

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

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• 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.

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• 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.

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• 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.

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• 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.

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• Source http//www.facolo.com/blog/What-is-the-dif
  ference-between-18650-lithium-and-other-lithium-ba
  tteries/