[rames14]

JPz, welcome to the forum. You are getting a lot of information that is pertinent to the units people have. Your new 2021 has a very different charger from a 2004 Montana. Your charger will do just fine plugged in and no need to turn off the battery switch. I never use the battery switch because it really doesn’t turn off parasitic loads like your CO detector. If you don’t want it plugged in, you are good to go if you disconnect the negative terminal. We have solar and I could leave mine unplugged, but we plug in to our 50amp RV plug. Lithium batteries are great, but not needed by everyone. It sounds like you have power available. Just plug it in, it’s the easiest thing to do and it uses very little electricity.