Thanks
@kitkat and
@Nova , that's very helpful. While I'd like to avoid leaving it unattended for many hours. the reality of my current situation is that it may be parked in the (secured) garage of my condo building, so this could be a situation where I'd want parking mode for an extended duration. The car would be/could be on a tender during that time. In that case, do you think I'd still have a concern about battery drain? Secondarily, if I did go with an aux battery, how big are these and where best to mount that thing? Am I back to pulling trim to accomplish this? And what's the expected park mode duration before depleted?