detroadster and others: I'm in the market for a dual battery set for my '92 Exceed and I saw you got the Optima Yellow Tops. From what I understand, AGM do less well over time when hot. Under the bonnet seems to get quite warm, especially when driving through the desert Southwest (as I plan to), which would result in electrolyte loss, ultimately shortening the life of the battery. I know these are sealed and designed to decrease loss, but the heat our batteries are exposed to appears (to me) more than comparable diesel uses (which I understand have better cooling). I'm new to this so help me understand where I'm wrong, but my leaning now is toward a wet battery that I can maintain. Topping off with distilled water every so often should help me get more life out of them, no? Otherwise, I would like the better hot/cold temp extreme performance of the Optima Yellow Tops (I expect to be using both in snowy and hot conditions), but I also have concern about how well our alternator will charge these.
Any insight into your experience, research, and thinking on how you landed on a decision would be much appreciated!