AAA to AA battery adaptor
thingiverse
This AAA battery sleeve allows you to use flat batteries in devices requiring AA batteries. Simply insert a small piece of aluminum foil or similar material into the narrow bottom part for contact. Ideal for households with portable phones always on charge and children using AA batteries without recharging, this sleeve provides an easy solution. I've designed a generous-sized tube accommodating various battery sizes, while also incorporating a shelf at the bottom for proper battery placement. To use, scrunch up a foil piece the size of an Australian 50 cent coin and insert it into the narrow hole at the bottom. Enjoy hassle-free battery usage with this simple DIY solution!
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