In my first job we had several UPSes for racks of equipment that had been augmented with marine batteries for longer life and all the batteries were on slats of

In my first job we had several UPSes for racks of equipment that had been augmented with marine batteries for longer life and all the batteries were on slats of wood to keep them off the floor. I asked and got the same answer you did - they will last longer - but I’ve never understood why.