We used to call those 100 amp fixed load testers "battery sellers". When a customer would come in with a weak or partially discharged battery due to a charging system malfunction, putting the "tester" on the battery was a good way to sell the customer a battery, along with whatever else it took to fix the original problem. Some of the shops in town would even recharge the "exchange" battery, spray a coat of flat black paint on it and sell it as a "rebuilt" battery. I was never willing to stoop to that level of so-called repair work!
Jerry
