3x AAA to 18500 battery adapter

A cylinder intended to increase the ext. diam. of a 18500 battery to fit a flashlight with a 3* AAA battery compartment
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updated April 13, 2023

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My flashlight uses three AAA batteries and I wanted to replace them with a single 18500 lithium battery so I needed an adapter because the battery diameter was smaller than the flashlight tube.

 

The cylinder I have made has 23mm external diameter, 18.5mm internal diameter and is 47mm long.

 

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