Review on Modikar BT705 Car Battery Tester 6V 12V Alternator & Battery Load Tester | 100-2000 CCA | Starter & Charging System Analyzer for Cars, Motorcycles, Marine, Trucks, and More by Joshua Reid

It was very easy to use. Functionally, it looks the same as with other manufacturers. I was able to get the internal resistance, cold crank amp, and the state of charge and condition of the battery. It looks like it will measure the internal resistance R and then calculate the CCA as 3V/R (3 volts divided by the internal resistance) assuming the battery is at room temperature. I also measured when the battery was cold - it reported an increase in internal resistance and a decrease in CCA. It seems that the state of charge message also assumes the battery is at room temperature. I found some Optima battery data that included both R and CCA and the CCA=3V/R curve went through the points but with the points scattered across the smooth surface. to bend. Because this correspondence between R and CCA in batteries is not perfect, the calculated CCA may not be perfect. That being said, I bought it because I had a suspicious battery. He measured the reduced CCA on the old battery and the CCA on the battery I bought to replace which matches the battery label. PC with a downloadable program. So everything worked, and it appears to be the same as what others are selling