Phantom battery for DSLR Konica FS-1

I have an old camera Konica FS-1 SLR from 80"s. But no Battery grip for x4 AA. I made the gripp and contacts to connect outside 6V DC. I don't know make tha contacts to sit batteries on printed PLA so I decide to use an phantom battery case. It is possible to use a USB battery bank, it's work !

The contacts on top is only a PCB blank, a small PCB fall lock the gripp.