This design allow to create a DIY powerbank with a 18650 Li-ion battery and a module like this :
https://www.aliexpress.com/item/5PCS-5V-Boost-Step-Up-Power-Module-Lithium-LiPo-Battery-Charging-Protection-Board-LED-Display-USB/32816858642.html?af=cc&aff_platform=aaf&cpt=1546603289096&sk=6mia6uv&aff_trace_key=0cb1cc600da64b0d98b18f01a20fc43a-1546603289096-06416-6mia6uv&terminal_id=87294648699c4acd9e863bbfc18639c7
Circular_A.stl | 181.7KB | |
Circular_B.stl | 83.4KB | |
Square_A.stl | 154.4KB | |
Square_B.stl | 66.0KB |