The Deka 8A31DT (8A31DTM) is an American made AGM (absorbent glass-mat) deep cycle battery. The AGM technology allows for a completely sealed maintenance-free battery with no sulfuric acid leaks, no acid clean up, and more power in the same space when compared to conventional batteries. It has an under 2% per month self discharge rate. These are manufactured by East Penn Manufacturing who also makes batteries for MK Battery.
The Deka 8A31DT (8A31DTM) is a direct replacement for any group 31 lead-acid, GEL, or AGM batteries