100-Amp Battery Load Tester Tests batteries on or off the car in just 10 seconds. Convenient, portable size and easy-to-read scales. Features and Benefits Heavy-duty, copper-plated clamps. 100 amp load capacity. 016 volt range. Load safety switch prevents arcing. Heavy-duty, chrome-plated, ventilated steel case. Works on both 6V and 12V batteries. Ceramic insulators. Determines state-of-charge, cranking, and charging volts. Determines good/bad status. Extra-large display with zero adjust. No. 3180 100-amp battery load tester.