I am just now replacing my standard issue GP24 Interstate Marine 12V 85AH batteries... These are hybrid deep cycle/starting batteries.
I got mine with my new 2008 Starcraft R/T14 popup trailer. I lost one right away for over charging it using a single mode battery charger but after replacing that for a good working smart mode type setup my remaining three GP24's just started giving out on me this past camping season...
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Roy's image
Thats around 8 years of use which included many 50% to 90% cycles over night which would take around three hours to do the next morning. They got a good work out with my camping off the grid alot and never got the fluids boiled out on me...
My success was to never let them get discharged below 12.0VDC and recharged back up right away... After 12 or so 50% to 90% cycles then I would always do a full charge which would take around 12 hours or so to accomplish
Roy Ken