18650 Simple Portable Charger Bank
thingiverse
This incredibly straightforward 18650 battery pack relies solely on a single 18650 and an extremely affordable board sourced from Aliexpress. It's engineered specifically for direct soldering of the battery, eliminating the need for any holders or mounts whatsoever. Secure with adhesive. Charger Board: https://www.aliexpress.com/item/2PCS-5V-Step-Up-Power-Supply-Module-Lithium-Battery-Charging-Protection-Board-Boost-Converter-LED-Display/32851037694.html?spm=a2g0s.13010208.99999999.259.481f3c00lz56JQ
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