18650 Battery End Cap
thingiverse
Protect your 18650 battery with a simple cap, preventing damage from shorts when carried loose. Add one to both ends or just the positive terminal for maximum safety. This cap also helps track charged and flat batteries. Note that some battery sleeves are slightly thicker than others, so I've included a Tinkercad model link to enlarge the center hole. Simply increase it by 0.1mm and test the fit. https://www.tinkercad.com/things/1Gdh5gR7rCq-18650-cap
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