this post was submitted on 29 Dec 2024
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Hi, I know next to nothing about flashlights, so this may sound stupid, sorry in advance but in all I saw these two posts so thought i'd drop a link
https://lemmy.world/post/23672875
Those are 18650 battery lights. A 18650 is about twice the diameter of a AAA. 18650 is the defacto standard for flashlights these days because of the size and energy density.
A 18650 is 18mm diameter and 65.0mm long.
The AAA battery is ~10mm diameter and ~40mm long, very close in size to a 10440 battery.
But you can't assume you can throw a 10440 lithium into a AAA flashlight, because lithium voltage is lower than a primary (alkaline, etc).
Other way round. But your point is still valid