Welcome to the forum!
We have enjoyed our 25.2 for 4 years, and see nothing that tempts us to make a change.
Where to start? Start with Ed Felker's excellent crowd sourced manual for Vegas/Axis. Find it on the forum under Motorhome Tech Topics.
There have been a lot of threads about batteries, but the quick answer is this: If your batteries, both coach and chassis, are original, it's time to replace them.
I think we need to stop calling it "working from home" and start calling it "living at work!"