When buying deep cycle batterys for camper

Are deep cycle batteries also built differently? I heard if you kill a car battery it wont come back up 100% even after a slow charge. It takes a 10% capacity damage hit every time..?
Just get a few of these GR-45's: 3900 amp/hours a piece. You can go off the grid for a month. Of course youll need another trailer to haul them....see credit card for size comparison
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