Thanks Mike for cleaning up my unintended double post. John, you have it right. I simply prefer to remove my battery’s from the RV and store them in the garage when not in use. Rather than send current through a jumper cable I simply charge each one on a 2 amp 6 volt charge till complete. My new Noco charger/maintainer appears to have all the features I need and for only 60 dollars. Regarding hydrometers, I understand there connection and use with battery’s. I simply try to avoid all contact with the acid when ever possible for a multitude of reasons. With that said I think I will change my routine and leave the battery’s in the coach so I can periodically apply a load to them. My converter will also maintain them while plugged in and not overcharge them. I’m told the load charge cycle is better for them than simply sitting in the garage while losing 50% of there capacity every month.