There are two Deka/Duracell 31 deep cycle batteries at Battery’s Plus. One is flooded (121 dollars) and the other is the AGM (239 dollars), both less 10% at pick up. Both can be used for cycling, but that AGM, which is really a dual purpose, is more often used for starting and the flooded version for the troller. In any case, both versions are good batteries and popular on BBC. I use rebadged wet Deka 27’s for my troller, and my first set lasted three years. Most important is to pay attention to the manufacturer’s date stamp when choosing them.