I want to build a 12 or 16 cell LifePO4 battery. I am thinking of using 32630 cells. I don't know where to get the cell connect straps. Is the same strap used for welding and for soldering? If I will give close attention to the cells, do I need cell balancing electronics? Can I balance them separately - manually once every few months? How much does cell balancing electronics cost forthis? Thanks.