I actually activated my Guardian online7 inch. Do you happen to have a contact number for Guardian?
Heh, not that laughable, unlike older vehicles, lot's have changed, but modern cars, especially one from 2019, the alternator is very capable of charging batteries at idle rpm. Turn off headlights and other unnecessary power drains on the system when you do this and it will charge just fine.@Markham
Do know that the purpose of a Battery Tender is to do what you say you are afraid of...
People, businesses, etc., etc, leave Battery Tender's on vehicles 24/7, 365 days a year as the tender is designed for just that.
To start a JL with an app from who knows where, for a few minutes each day is absolutely, laughable at best. Doing so will deplete the batteries even further and of course there are a host of other reasons not to do this. Doing this is a foolisih move at best...
Best bet is to just leave your JL plugged into a decent Battery Tender when you are out of town or if the JL will sit unused for days.