BTW, I have been reading up on batteries and chargers lately to kill time- I don't need either right now, but until winter finally breaks and I can do my haulout, I got to have my "boat fix". So, I can't figure out how to do the link- but google "Car and deep cycle battery frequently asked questions by Bill Dardin". This is the best and most comprehensive treatise I have seen on batteries. It goes way deeper than my Calder "bible" and certainly way deeper than any of the battery manufacturers.
Gary