Everything seems to work very well. I have a car (new) that I don't drive much. When I hooked up a battery analyzer to it, it said the DC voltage was a bit low and the CCA was very low. That worried me. But after running the car for about 20 minutes and then plugging it in to check the battery; This gave a much higher CCA and the voltage was where it should be. I even checked it a few minutes later and it matched the reading. The car has probably not been driven for about 2 weeks so it seems logical to me that the voltage readings will be a little low and the CCA low before I run the car to allow the alternator to charge the battery, well (much lower in mine case) . I've only had the BT100 Pro Battery Analyzer for a few weeks but it seems to be working great for what I need!
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