Flooded,AGM or Gel deep cycle batteries 12volt

I use 2 12V AGM batteries. Another advantage of AGM is that they charge faster than flooded cells so make sure you have a smart charger that has a 14.4 V 'boost' mode for fast recharging to 90% capacity. I added a Charge Wizard accessory to my Progressive Dynamics 9100 series charger to get that capability; the 9200 series has it built in.