Well, my Trillium
battery lasted about 10 years with careful
maintenance and a battery tender. It was a 130 Amp Trojan Deep Cycle.
I got such good service from it I bought another one (not cheap at $230)
It ran everyting in the Trillium
including a 600W inverter for the juicer,
satellite radio, lights
, and ham radio equipment. A simple 150W solar panel
and charge controller always kept it up. Might be too big for the little
battery compartment of the Casita
? Anyway, I prefer Trojan deep cycle
batteries over Walmart or other cheaper ones.