Re: Questions.
Yes, we were plugged in to power all weekend so I am sure we ran mostly off AC to DC power the whole time. The battery did not die, everything was fine all weekend. Plenty of power, since we were plugged in. It's just that when we got home, and I connected to the big charger to see how the batter was doing, my battery was no longer showing 100% charge; it was down to about 25% charge, which makes no sense. I may need to just have the RV power system (charging system) evaluated.
I will also take this new battery in to have a diagnostic done. Not sure about "specific gravity."
And yes, I need to show more attention to the wife. That's for sure.