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Originally Posted by sparker
Optima's should be charged at 15v, most alternators do not put this voltage out without a modification.
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Optima's preferred charge rates (time to reach full charge from a given level of discharge) is 14.4 volts at temps above 41 F, and 14.7V below 41F. The are not a problem on any decently performing charging system; we have never encountered a problem with Porsche's keeping them fully charged. Some maintainers (such as Ctek) have an Optima "optimized" charge cycle, but all that does is get the battery to a full charge quicker. In reality, just about any decent maintainer will keep the Optima happy; they just may take a little longer doing it.....