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AAA to AA battery adapter with polarity protection

AAA to AA battery adapter with polarity protection

thingiverse

AAA to AA Battery Adapter It's perfectly safe with a built-in reverse polarity protection system. All you need to do is screw a standard PC case M3x4mm screw into the tip hole. I used a round-head screw, and most M3x4mm screws work just fine - they usually have a 2mm head, bringing the total length to 6mm.

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