Top (positive) and side view of several [18650 cells](/entry/tc-ec-cell-18650). 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.

Image

18650 cells of different lengths

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An 18650 cell is a standard format [cylindrical lithium-ion](/entry/tc-ec-cell-li-cyl)
[cell](/entry/tc-ec-cell-s), with a diameter of {this.get(prop=prop("diameter"))}
and a length of {this.get(prop=prop("length"))} (slightly larger than a
[AA battery](/entry/tc-batt-aa)).
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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Description	Top (positive) and side view of several 18650 cells. 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.
Creator	Keysight Technologies
Relates to	TC18650 cell
Source	Photos courtesy of Keysight Technologies, used on TechNotes with permission.
License	All rights reserved ^(*)