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Discharging more than the design specification will greatly reduce the life of the plates in the cells. There is less lead to lose, so damage occurs more rapidly. The largest factor noticed will be maximum current that the batteries can produce, and the heating damage cause by overcurrent of the plates AND intercell connections. Trying to make an R... V/Marine Deep Cycle battery supply the same current as a Golf Cart battery will result in greatly reduced battery life. You MAY get 16 to 18 months of acceptable operation before you'll be ready to replace them. Likely less, when you try to pull several hundred amps from a battery designed to deliver less than 50 amps and the internal connections fail. Many will explode when this happens, as it ignites the hydrogen gas in the cells. I have experience in this regard. I have seen quite a few EVs where people have tried to replace their Deep Cycle batteries with the RV/Marine Deep Cycle batteries, and it never ended well. They overdischarged the batteries and ended up replacing them quickly. The proper batteries for the task can last 5-7 years or more. I don't remember seeing a RV/Marine battery used in an EV ever make it to 2 years of service life, and range was greatly reduced as well. I've designed solar power system Lead/Acid battery banks to last for 15 years or more, simply by increasing the capacity of the battery bank by a factor large enough to prevent overdischarge during extended periods of bad weather. Most engineer for 3 days of no sun, I engineer for 5 to 7 days of no sun. BobRead More