This question is keeping me up at night! Do LFP prismatic cells need to be confined with compression plates or do you want to leave space between cells so they can expand and contract? I've search all over and have found compelling arguments in both directions. I purchased used Calb Cam72 cells and assembled with 10-32 allthread, Calb plastic cell caps and Calb center spacers/nameplate and used them for one weekend. Before connecting, I bottom balanced them. Then charged them very conservatively with 400w panels and epever charge controller (with settings I learned here) to about 80% and didn't discharge below 50%. all cells remained balanced. When the weekend was up, I noticed that the outside cells had a very slight bulge. Does anyone know the proper way to mount/assemble these cells? Any insight would be greatly appreciated.