Salvaged 18650 USB 1s12p Power Bank
thingiverse
Yeah... So, stack two rows of six 18650 cells vertically, nickel-tabbed. You'll get a compact device. These products are mass-produced in China and available on Amazon, Alibaba, or AliExpress. The design is based on this product: https://www.amazon.com/Dual-USB-Power-Bank-Board/dp/B06WVMY2YW?SubscriptionId=AKIAILSHYYTFIVPWUY6Q&tag=duckduckgo-ffsb-20&linkCode=xm2&camp=2025&creative=165953&creativeASIN=B06WVMY2YW. Place the circuit board inside and solder it to the battery's plus and anode, using some leads. Secure the components with hot glue if you prefer a solid build.
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