I purchased a 1998 Hunter 310 3 years ago and had no battery issues until they died this week (they're over 6 years old). The previous owner had a "house battery" series/parallel 12 volt set up using two sets of two deep cycle 6 volt batteries (4 total) with 232 Amp hours at 20 hrs each (Interstate brand). I'm told that this set up is best as it provides the longest power supply. I'm not an electrician and know nothing about what batteries are the best for the power needs of the Hunter 310. The replacement Interstate Batteries with the same specs are $150 per battery. Costco has a 6 volt RV battery rated at 208 Amp hours at 20 hrs (also Interstate) for $84 per battery, Is it acceptable to go with 208 Amp hours vs. 232 Amp hours to save 40%?? Help!! Thanks!