I have only one problem with the optimas. I have a 140 amp alt. and when I have not driven the car in a month, I have to be careful about how much rpm I use. The belt will start slipping, I guess cause the batery is not at full charge, the volt meter does some crazy things. Once I've driven the car a few miles it acts O.K. I don't know for sure, but I don't think the batteries take a charge as easily as a lead acid battery. I don't have this problem with my ford that has the old style charging system.
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