...there aren't many secrets anymore; they're all pretty much alike, relatively speaking. The BIG difference is the warranties that vary considerably. And, when I consider a new lead/acid battery and a tank of gas are about the same, i.e., a battery is no longer a "major purchase", as they once were (competition is such a good thing). So, I find the highest output battery that will fit in the tray, keep it charged, and dang if they don't last about 5 years, if it is never abused.
However, leave the lights on and have it run flat, I have found after ample "experimentation"
it takes about a minimum of a year off of it's life expectancy each time it happens...IF it finally does take a full charge again.
Currently I have a Wallyworld Everstart - their higher grade "72" series that is listed for the ZR-1. If I recall it has 800+ CCA. Believe me, even when the temp is around zeroº, it really whips it over nicely!
I also have had good results with the Interstate line, but I don't know who makes either the Everstart or the Interstate.
P.