Cavie you sound like you know your stuff when it comes to electrical systems. So I would be grateful for your advice.Both of my batteries recently went bad. They were both from 2018. I had a very bad rotten egg smell and found that it was the batteries. I have heard that the rv converters don't do a great job when regulating the battery charge, sometimes overcharging them. How often should I check the water in my batteries? should I look into something to hook up to control the battery charging from the converter? or should I wait and see if I have a problem with these new batteries. Is there a way to check to make sure the converter is working properly? The coach is only 1 year old. Thank you in advance. K.