These are classified as a starting battery by Johnson Controls. They do not have a Deep Cycle rating. Since you now own them please keep us up to date on their service.
The 31DCM are manufactured by East Penn and are the private lable version of their DEKA Deep Cycle brand.
In a message dated 3/26/2020 5:07:22 PM Eastern Standard Time, electricforum@discoursemail.com writes: