18650 Li-ion dual battery case slim fast and dirty

I needed a 18650 dual battery case to fit on my old Turnigy 9x.I tested some designs here on thingiverse but to my surprise no one fits to my Turnigy 9x battery bay.
So I modified one of designs and adapted it for my TX battery bay.
It is a modification of this design.
https://www.thingiverse.com/thing:2435782
I did not like soldering directly on battery(I needed them to be removable and charge them separately) so I used a fast an dirty solution for connectors.Copper sticky tape glued on the