The file 'Charger 18650 3D Printer Model' is (stl) file type, size is 4.7KB.
Elektronik
https://www.neuhold-elektronik.at/catshop/product_info.php?cPath=222_361&products_id=7181
4mm Stecker
https://www.neuhold-elektronik.at/catshop/product_info.php?cPath=41_57&products_id=4245
Battery Spring Plate
https://www.banggood.com/10-Pairs-Silver-Tone-Metal-Battery-Spring-Plate-Set-for-AA-AAA-Batteries-p-1046111.html?rmmds=search&cur_warehouse=CN