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Anything less than 90% charge for starter battery will take a lot out from it's life.
They generally can take 1000 cycles if allowed to discharge below 90%, but can take something like 10 times of cycles if never discharged below 90%.
Deep cycle batteries are better, plates of solid lead, weights lot more than starter battery and will take lot more punishment, surely cost is quite lot more.
I don't know if Optima or other brand AGM battery would be good, no lead so very light and I have heard that will take lot more abuse than starter batteries, however worth to investigate.
This is at least what I have found out while researching batteries for my house.
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