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Thanks so much for the answers! I would like to test my 12volt boat battery. I have been charging it with my pro charger and it is telling me that there is a problem with my battery. It does crank my 115hp yamaha but I usually have two kids on boards so I don't want to stuck outside on the water.
I have used volt meters and hydrometers before but they are not totally giving the correct result. In the past they told me that my battery was ok but the battery didn't give its full cranking power.
What do you think about the "Solar" battery testers? They test cranking power....