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car batteries are designed for multiple small discharges of short duration i.e. lots of discharging to 95% of capacity then recharging. They do not cope well with being regularly discharged to deep levels - that's why you usually need a new car battery after you've flattened it a few times by leaving the lights on.
if you get a battery closely sized to your load, make sure it's a deep cycle one, or the life time will be... lacking.
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