To follow-up,; The dealer did replace the battery, under warranty.
I went in at 2 pm, they were outta there at 5 pm, so they kept it overnite "to complete the battery test they had to do" (I think they were f'ing the dog, confused, new service advisor, whatever). I did get them to pick me up at home to go get it. And it was under $100 for an oil change, tire rotation, and NY inspection. They did not push to sell other stuff, so I appreciate that. The cashier had me sign the warranty paperwork, but wouldn't give me a copy (I recall seeing about $400 on that). But, I got a new battery, and documentation that they replaced it under warranty. ASS has returned, so I'm back to reading expected stop time and using manual-mode when I expect the stop will be less than a minute