Coach Batteries in Motor Home

I did the same thing 2 years ago was told that I needed new batteries. I went down to Les Schwab Tire to get 2 new batteries and the service Tech told me to wait that he wanted to do hydrometer test. The batteries tested in the high 490's he told me too go that I didn't need new batteries and this is my third year on the coach batteries. I had two dry cells prior to going to Les Schwab.