Oxide (Exide) GNB batteries are made in Mexico. The reseller GOHNER (By golly it's a goner right from the git go) has GNB batteries. And if they are deep cycle I'm a reclusive billionaire.
A marine starting battery is a car starting battery with cutesy terminals.
Gullible people are lied to and told "Ooooooo lookie! Our emergency exit lighting system uses exactly the same battery we're trying to pawn off - I mean, sell to you as a superior RV battery"
Emergency batteries are changed according to maintenance turnaround schedule and they are NOT designed to undergo frequent nor profound discharges.
But so be it. It's not my hook, my line, my sinker, or my flesh at stake. They could two tone a sheep and call it a whiteface and some people would reach for the A1. I expect to see whitewall load range E tires any time now.