I use silicone. I feel this battery built w the pcb, at least this design, there’s a lot less stress on the nickel when the cells are being help n not the pcb.
And don’t know if u saw I did a conductivity/resistance test with the cells welded vs just taped w conductive paste under and just tape shows a bit better. Only 3 welded on everything but still. I’ll see the just-tape battery’s ohms after a lot of use and see
Still welded to the cell though. Tempted to try just tape there too. At least with these iron cells I can’t blow up. Or have magnets for holding to the cell too