If you are just finding out about the batteries in your RV, this podcast should be helpful. 

How often and what kind of batteries should I buy and maintain? 

What is new in batteries this year?

Here are a few websites to visit to get the latest information:

https://gpelectric.com/choosing-batteries-for-rv

https://www.sciencedaily.com/releases/2021/09/210923165942.htm

Margo's book: Conquer the Road: RV Maintenance for Travelers [ https://amzn.to/2L5H7bk ]