The protection circuit (center) of an [18650 cell](/entry/tc-ec-cell-18650). The cell on the left includes the protection circuit, while the one on the right has had the circuit removed.

Image

18650 cell protection circuit

This content is under copyright and all rights are reserved. Content with this status cannot be used on other sites without permission, and must have a note explaining how/what usage rights have been granted to TechNotes.

All rights reserved

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

Content License

TechConcept

The creator of this work, e.g. the designer or inventor or photographer or author.

Creator

The copyright license(s) under which this work can be used.

License

Lists TechNotes entries that this images relates to.

Relates to

The source where this work was published.

Source

**Legal notice**: The content on this site is provided with no warranty, express or implied. **Do not rely on this content for any important purpose without verifying it independently**.

**License**: Text content (articles and descriptions) is available under the terms of the [Creative Commons Attribution-ShareAlike 4.0 license](https://creativecommons.org/licenses/by-sa/4.0/). Properties and their values are public domain. Images and other media files are available under various licenses - refer to each item's page for details.

**Cookies**: We do not use cookies or other tracking systems unless you log in, in which case a strictly necessary cookie is used to keep you logged in. We do not use third-party cookies.

**Platform**: Powered by [Neolace](https://www.neolace.com/).

Creator	Keysight Technologies
Relates to	TC18650 cell
Source	Photos courtesy of Keysight Technologies, used on TechNotes with permission.
License	All rights reserved ^(*)