deep cycle batteries

We have a SeaRay 240 Sundeck and it has the ability to have 2 batteries and a battery switch. Its time to replace batteries again, and I am always curious if it is better to have 2 starter batteries or 1 starter and 1 deep cycle. Most of the time, the radio and bilge pump are the only...

I've seen several discussions on battery configurations, but I still don't get it. Any assistance would be appreciated greatly! I have recently purchased a 2004 Sundancer 320DA. It has two Mercruiser 350 Horizons, with v drives. It has a 5Kw Kohler Generator, and 4 batteries. It appears...