100-Amp Battery Load Tester 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.. 0–16 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. 3181