Similar size as AA cell. Those with a protection circuit are slightly longer. Used in many LED flashlights. Nominal voltage is 3.7V. Variants include: Tesla Sets Record for EV Deliveries, but Losses and Solar Shrinkage Endure: 2019 is supposed to be “the year of the solar roof,” but Tesla’s solar business continues to wither, Eric Wesoff, 25 July 2019, accessed 23 October 2019 Lithium-ion rechargeable batteries are generally not interchangeable with primary types using a different chemistry, due to their higher voltage. Many are also available with protection circuits that can increase their physical length; for example, an 18650 is around 65mm (2.56in) long, but may be around 68mm (2.68in) long with a protection circuit. Some such circuits increase cell diameter instead. The increased dimensions may mean the cell will no longer fit in battery compartments intended for cells without such circuitry.

This section needs additional citations for verification. Please help improve this article by adding citations to reliable sourcesin this section. Unsourced material may be challenged and removed. ( July 2011) ( Learn how and when to remove this template message) a b c "HDS Systems: Frequently Asked Questions – Answers to questions about our flashlights and technologies". Hdslights.com. 13 August 2005. Archived from the original on 17 October 2013 . Retrieved 23 February 2015.www.gpina.com (PDF) https://web.archive.org/web/20120326190515/http://www.gpina.com/pdf/GP1450L70_DS.pdf. Archived from the original (PDF) on 26 March 2012. {{ cite web}}: Missing or empty |title= ( help)

Maha Energy". Maha Energy. Archived from the original on 15 October 2013 . Retrieved 12 October 2013. In Switzerland as of 2008 [update], these batteries accounted for 16% of lithium camera battery sales. [75] Energizer No. 504" (PDF). Datasheet.octopart.com. Archived (PDF) from the original on 5 March 2016 . Retrieved 23 February 2015. LP1044 Rechargeable Focusing Penlight 360 Lumen LED Flashlight". LUXPRO . Retrieved 23 August 2022.Computer batteries" (PDF). www.mouser.com. Archived (PDF) from the original on 2 February 2019 . Retrieved 21 April 2018. Xiaomi M365 Specifications". 31 July 2019. Archived from the original on 31 July 2019 . Retrieved 31 July 2019.

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