Every 6 months or so someone starts a thread about using a solar panel to run a battery charger. Eventually someone mentions putting a deep cycle battery between the panel and the charger. I'd like to know which deep cycle batteries have run the longest for you before dying. Actually, I'd like to hear how many years you got from different brands of batteries you use in any deep cycle application -- golf cart, summer cabin, boat, RV, whatever.
I'm thinking that the 'serviceable' batteries have a better chance than sealed cells, but I don't know.
Which deep cycle batteries have served you the longest? The shortest?