Battery Pack for Headlamp - 18650 DIY
thingiverse
I made a power pack for headlamps. I used two 18650 cells giving a total of 4.1V. The original power supply of most flashlights is 3 x 1.5V, so it is possible to convert it without the need to use voltage converters. The entire project is available for free. I used PET-G and TPU filament for printing. Maximum dimensions of the cell loader: 22,6x18mm https://youtu.be/rD6PNqtT8sI
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