Thanks Maine for the excellent analysis and references. I had gel cells on a previous boat and got good service from them. Five years ago When I was replacing flooded batteries on my new to me boat, I thought that AGMs would be a step up in reliability & service. Was also concerned about less gassing as the batteries are located in an unvented compartment under the aft berth as configured by Beneteau. Will have to reconsider when I need to replace the present batteries. I really don't want to spend $1800+ for a high quality AGM bank that consists of 4 group 31 house bank and a group 27 starter battery. Might have to reconsider gels again.