Easy to install, easy to use and works great with most batteries. Unfortunately, this doesn't work very well with high-capacity AGM batteries with thick plates. The CCA calculation and definition seems to be calculated from the internal resistance index. I contacted two different battery manufacturers and got the same advice. The only way to accurately test this type of battery is to use a "carbon stack" battery tester (which I've never heard of). I have tested this tester on both car batteries and general purpose AGM deep cycle batteries and it has worked reasonably well, measuring both CCA and voltage and giving a reliable indication of battery health in my opinion.
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