Making a Worx high-drain battery from three Sony C6 cells (specs shown). When spot welding, because the nickel strip is fairly thin, tap lightly, then tap again; the finished welds ‘look a bit ugly’; multimeter reads 12.6V, full; the gaps are filled with glue to hold it; Sony C6 3.0 (Ah) done. Comments ask how much the welder is and what brand, what glue (creator liked it), whether a 12V drill can use it; someone says this welder can’t do 26700, not even 1.0 nickel-plated steel strip; and whether a broken, unsoldered thermistor lead matters.