Thanks Rusty, that's exactly the kind of info I needed. Pretty sure I have to stick with the group 24, unless I buy bigger battery boxes, and modify the mount to make room. Its a dual battery system.
Look at part number 24DCM from O'Reilly. That's the group 24 style deep cycle marine battery. O'Reilly batteries are made by two companies, both of which are in USA. One is East Penn Battery and the other is Johnson Controls, which makes the Interstate batteries. East Penn has been making Deka batteries since the turn of the 20th century. The group 24 marine style battery from O'Reilly is also not maintenance free, which means you can add water and electrolyte to it as need. I cannot stand maintenance free batteries. That's usually what kills them. They dry out.
