Just had my main and auxiliary batteries replaced on my 2017 JGC Overland. The start/stop message is still there and I was told by the advisor that it could take a couple of on/off cycles for the start/stop to learn and program itself.
Exactly ... which makes me think it's a problem in the charging system somewhere, rather than in the battery itself. Unless they got a bad run of batteries that included both my original and the replacement.
A couple of days after I had both batteries replaced, start/stop working great and then......at the 3rd stop it would not start. All lights flashing on dash and then everything went black. Had to have jeep towed to the dealership. Diagnosis found a faulty cable going to the alternator. Either this was damaged when the batteries were replaced or defective from No wonder the battery was always charging. Hopefully this fixes the issue.