There’s a lot more that goes into deciding when to activate the start/stop mechanism than just the battery. Engine coolant temp has to be high enough to keep the heater/defroster working. High electrical loads like headlights, rear defrost, wipers, seat heaters may also prevent the engine from stopping. The catalytic converter in the exhaust system needs to retain enough heat to maintain efficiency once the engine starts again. If you live in a colder climate it wouldn’t surprise me if the start/stop does not engage during the winter months.
2 Likes