The file 'Powerbank Case For 3, 4 Or 6x 18650 Cells 3D Printer Model' is (FCStd,stl) file type, size is 1.5MB.
Board (USB Module/controller): https://www.aliexpress.com/item/32908536831.html
Can be customized to any cell's capacity: FreeCAD source is attached
1s6p.FCStd | 1.4MB | |
1s6p_body_3p.stl | 88.4KB | |
1s6p_body_4p.stl | 89.5KB | |
1s6p_body_6p.stl | 88.4KB | |
1s6p_cap.stl | 134.2KB |