Sam's Club in some locations are now offering Duracell Automotive, Marine and RV batteries.
I just purchased a Group 78 battery for my Chevy Suburban, that has a 3 yr. full replacement and 8 yr. pro rated. I purchased the Duracell Extreme Power and Marine & RV batteries utilize AGM or Absorbed Glass Mat Technology, battery vs. the standard sealed battery.
East Penn Manufacturing the makes Deka batteries are producing them.
Sam's Club offers both standard 6v Golf cart batteries and the AGM batteries. I expect their battery business will increase due to the reputation of Duracell batteries.