Don't think you're being dumb. What should be simple seems more complicated and confusing every time I look into the subject.
Recently went through the process of which type of battery for the 35J. In the end, I cleaned up the current batteries (they tested perfect), cleaned up all the corrosion (from previous owners) and monitoring for excessive gasiness.
As for the converter, the manufacturer said the AGMs could be charged, with a caveat. The converter does not limit the amount of current going to the battery to the 10 amps specified by Optima. Also stated no converter did. I don't know, just what I was told.
Enjoy.
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Richard
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