18650 Simple Portable Charger Bank

This very simple 18650 bank uses a single 18650 and a cheap board from aliexpress. It is designed for direct soldering the battery, not using any holders or mounts. Fasten with glue.

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