I went to optima years ago because the cells were round--the flat plate batteries would fail because of the tire shake and accelleration forces in my drag cars--the round cells solved this issue

And Like Pat, altho not a boat yard I spend some days on battery room duty at United Airlines taking care of battery charging--big deal--lots of acid and current---and the damn door opened inwards instead of outwards so you couldn't get out with acid in your eyes---oh, did I tell you about the acid and your clothes?? even with the rubber aprons, gloves and face shields????