I have a 2005 2665 Regal and no idea if the batteries were ever replaced. We bought the boat in Oct 2007 with 153 hours on it. I looked at the tops of the batteries and there are no month/dates punched out on them. The marina where I bought the boat doesn't have any records of replacement batteries either. So here's the question.....would you replace both batteries or just one next spring? There's 205 hrs on the engine now, if that matters.