18650 Powerbank

3D printed casing for the following modules:

https://www.az-delivery.de/products/18650-board-dual-usb-5v-mobilmodul-lithium-batterie-ladegerat-board

version 1: for 1 lithium battery
version 2: for 2 lithium batteries

using also battery contacts:

https://www.amazon.de/dp/B0BJ6HP86G/ref=pe_27091401_487024491_TE_item?th=1