Top (positive) and side view of several [18650 cells](/entry/_7RHY0mKlOEp2xsahAaNcbc). The green and yellow cells have the standard length of 65mm, while the pink cells are longer due to the presence of a protection circuit.

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18650 cells of different lengths

An 18650 cell is a standard format [cylindrical lithium-ion](/entry/_75HaEKOi2Ir5UV84KH3CGk)
[cell](/entry/_4HwJfgRjCzfOI7z2XTzY0r), with a diameter of {this.get(prop=[[/prop/_3JjzqBJ9YLtRGuesdK0lWb]])}
and a length of {this.get(prop=[[/prop/_1PPhmzTVqhSwjbyZtAsIBm]])} (slightly larger than a
[AA battery](/entry/_1bWGkkQDaPxHwmcMkO5cbu)).
The 18650 cell has been used since the late 1990s and has been popular for a wide range of applications that
require a rechargeable battery - such as flashlights, laptops, power tools, and even electric vehicles. Due
to the popularity of the 18650 cell, they are usually an easily available, well-understood, and affordable
option.

18650 cell

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Creator	Keysight Technologies
Relates to	18650 cell
Source	Photos courtesy of Keysight Technologies, used on TechNotes with permission.
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18650 cells of different lengths

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