This is a docking mount for 3S 18650 li-ion batteries, that will be mounted onto 80x65x30mm extruded aluminum case, inside of which will be step-up dc-dc converter, that will raise the output voltage from li-ion battery to 24VDC. This will be used as portable power supply for Quicko T12-956 soldering station.
Holes to mount are designed for M4 screws with cylindrical head.
Battery contacts: https://www.mouser.de/ProductDetail/534-5331TR They need to be modified - where is the 90° bend, you need to bend it with 2 pliers for 180° to the opposite side, so the screw hole is below the curved bend. Holes for mounting battery contacts are for M2.5 screws, hole drilled through 3d print should be made manually.