‘Shuyang’s got a job’ — a neighbor asked him to build a power bank and the materials are in: power-bank board, shell (transparent yellow), battery tabs (nickel strip), cells (6 × 18650, bought earlier). Out comes the AWithZ ‘touch welder’ (spot welder) and he starts welding the tabs; welds the negatives; welds the leads; flattens the cells out (two groups of 3P?); solders the red and black leads to the board; fits the shell and screws; shell on, see whether it charges: it lights up, and it’s fast charge; peel the film, slip the sleeve on, peel the outer film, fit the lid, screws in, done; detail shots, the transparency looks great, cyberpunk style; charge test again, fast charging, the board he bought is 22.5W PD; ‘Dad, the power bank’s yours now.’ Comments (823): fish-paper rings on the positives, fish paper under the folds, strap the cells, keep the positive weld inward — a missed weld can blow the tab (9); no fish paper on the positives is unsafe (3, creator: the cells have 2 layers of insulation of their own); makes me want a spot welder (3); same UF20B, press the pen down a bit harder before triggering, fewer sparks and nicer welds; better to buy a CUKTECH, 50-odd yuan for 20,000mAh at 55W (it’s for hands-on practice); this kind of board leaks and starves the cells after two months unused; 22.5W is slow charging.