Battery/Local Power

[Flatlander in Vermont]

Trying to learn how the Battery and local Power works and Battery Charges Etc, tried to find the owners manual online, it wouldn't download couldn't find it in the manual, have owned several campers and they all worked different, this is my first 5th wheel a 2011 Montana High Country 343RL, we bought it last fall and just got it set up and even using power to put the slides out was confusing any help would be appreciated Thank you