I'm confused... Went to the local WM Store for new batteries for me boat. Needed two strong deep cycle batteries for my trolling motor and a good starting, radio, lights and accessories battery. I see a battery that is called EverStart Marine Extreme. It has 825 marine cranking amps and 205 reserve amps. What is that. Will it work good for both trolling motor and starting. Of course no one at the store had any idea.