As Expected the Mercedes Benz Tech arrived within 30 minutes ( on a long weekend Sunday ) Checked and Jump started using a well charged donor battery.
He suggested I take a 40 minute round trip anywhere ( not freeway ) and we turned the auto start off manually to be sure I made it past the T intersection at the end of my street.
Paper done work and car running in under 10 minutes
I took the Car for a 2 hour drive and found some old road sport mode action, The Warning to "Stop vehicle and leave engine running" dash warning dissappeared at about 45 minutes.
I've use the charger to top up the battery and we're all good,
I'm thinking I'm going to get a new jump battery similar as it was much more convenient than the truck Jumper leads I've had for 10 years.
BTW you'll need a T40 Torx and a 8 inch extension bar If you need to swap out batteries after the 3 year warranty.