Auntie brings a toy car: steering bad, lights not on, only lighting up now and then; her handle is 'Special Talent'; batteries test 4V/3.1V, charged, all freshly replaced. Auntie says fix the little toy first and if it's done well she'll bring the big e-bike; 'that's not right, I heard you fix things well so I came specially'; the repairman jokes 'that leaves me cold, no mood to fix it, I'll make it up on the price'. Fixed, it responds; the switch was reworked; ¥30 will do; 'come when auntie's not around'. Job two, a floor scrubber: replace a set of 10 cells; the customer brought it from Xinzhou, diagnosed the aged battery himself, doesn't seem to have a spot welder so asked us to weld it; spot-weld cell by cell (1234...); measure the cell voltage 3.79, 'these cells are really standard'; fit and test, check whether the battery locks in, original batteries are just better; plug in and watch the charging response; battery ¥40; charging wattage 36W, full power, floor scrubber perfectly fixed, cells balanced in every respect, let it charge a while. Comments: was the RC car dead because the board was shorted; only you do real repairs; a room full of floor scrubbers; all sorts of repair requests.