water in batteries boiling

pappaone wrote:
I went to check the batteries in the MH two 6 volt and when I removed the filler caps noticed the water was bubbling (boiling) what causes this and what do I need to do??


Thank you

Don't know how long you've had the coach or of it's history, concerning the Inverter or Converter charger and must assume you have been connected to shore power for this to have occured.
In most cases a good modern charger of said properties will do an excellent job of floating and trickling, so as not to cause any undo charging. It could be that the batteries are bad or you were or are using them a lot and asking for this high charging current from the charger. Are you sure there's nothing turned on, that shouldn't be, like the fridge running off the inverter, perhaps and just for example?
Taking the batteries to Sam's is probably a waste of time and after all else fails, you might just disconnect them and see how long they stay up. Then hook them up again and compare the voltage while not connected to shore power and then with them connected.