You can get the particulars on coach build in the COM_NET
link at top of page.
You need last 7 numbers or letters of Vin# or the coach build number with CS added at end of numbers.
If owner does not know how to maintain their batteries that's not Newmars problem.
Here is a Brochure
and Owners Guide
Below in my signature are links to many others that relate to the coach.
Good luck in your hunt.