Do these or don't these have a metal/steel case? Nathan tells me I'm wrong for saying they have a protective metal case, Denim says (and everywhere you read) the "s" series steel case????? I thought the "s" stood for "starting" battery? I am calling mechman and nathan tommarow anyways with other questions about BOTH batterys I got, but thought others might want to know on here? I definetly like just talking to people on the phone when I'm giving them a bunch of MY money. If anyone is incorrect, it is probably me. But there is a chance it is both steel and starting, as you can see on the XS power site: Mobile Audio