I plan on building a box to give constant pressure so I get real constant welds. I have some I want to connect together for testing and some for my RC stuff. Now that I don't have to worry about those micro wave transformers I can get on with welding. I have a series of 4 CALB cells for my 12 volt pack. Its light enough to carry and I can lug it with me if I need to weld out in the field.
Finally, a DIY welder you can build or buy to do good spot welding of the tabs instead of soldering and making a mess. I hope to build a power wall with some cells and if the cells I am testing are good I will see if I can buy enough for a pack for my EV and enough for two for my house. Built it myself and it they re LiFePO4 chemistry. The safe Chemistry.