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This kind of uses battery size term – so named for its lithium ion at a size of 18 diameter, 65 length and cylindrical shape.

DAX Kit: 2 Rechargeable : High Lumen LED , Super Bright, Zoomable, 5 Modes, Grade, Water Resistant, Batteries, Charger, Gift Box

https://en.wikipedia.org/wiki/18650

https://en.wikipedia.org/wiki/1865

https://en.wikipedia.org/wiki/1865_in_the_United_States

https://en.wikipedia.org/wiki/1860_Mount_Lebanon_civil_war

Best 18650 Flashlight of 2018 – Top 9 Flashlights & Buying …

Top 5 Best 18650 Flashlight in 2018 Reviews & Buying Guide