Opening: a customer blames the boss for not fixing a battery problem — “you’ve got me wrong, have a Zhonghua on me” — the Soaiy speaker shows volume as soon as it’s twisted, turns out it just wasn’t charging; Bluetooth / radio modes fine, no mic mode so Bluetooth is right; voltage measures 3.67 vs 0.7… “this battery is fine; just one volt on the other, that’s a big gap, go buy two batteries”. The kid’s thing works plugged in but not unplugged = the battery inside is dead and won’t charge, swap it and OK; the cable burned and was replaced before, the socket is discolored and needs replacing too, hang on. The old stove has run seven or eight years and is hard to fix; weak water feed is a common fault, try a steering motor first, give up if that doesn’t do it; the board is aging; two motors (rotation / water feed), and a bad water motor upsets the steering too; people often fail to fix things, take them apart and bring the pile over. Soaiy follow-up: “you didn’t even put the batteries in right, you’ve got me wrong” — measured voltage for ages, all normal, small screw fitted, done. A camera with no charge and won’t take one: check for charge current, long unused, the alternating red LED flags two faults — battery bad or water in the board; battery seems more likely, it’s fairly new with no water damage; fit a good cell — “give it unlimited learning opportunities; this cell is a bit wasted in there, overkill, an absolutely good cell”. Dongcheng pack: high-temp fish paper for insulation against cell-to-cell shorts, voltage present, LED steady not blinking, charging at 9W 1.7A; red charge LED steady; bye, kid. Comments: please tell us the fault causes and how you test / fix; a noodle machine unused for ages won’t charge, fixable?; a cordless vacuum won’t run; address; honest repairman.