[firstlight]

2006 36' open qsb 380
I have five agm batteries  three designated for the engines and two for the house and generator.
My house side batteries are two years old and lately after vessel sits at anchor for three or four hours the batteries go dead.
I load tested them after fully charged and they read ok.
i have the cabin refrig, the cockpit refrig. and electronics on for the period of time while at anchor, nothing more that I have used or the last five years? 
Any thoughts or similar problem? thanks