The dealer is most probably correct-the various ECU’s involved will have a set number of pre-conditions to engage the stop start function (state of battery charge, coolant temperature, cabin temperature & air conditioning load etc) and if these aren’t met then it won’t function.
Doesn’t take much of a voltage drop of the main starter battery to fall outside of these conditions, but still being able to start the car on a twist of the key.
The advice above of investing in a CTEK or similar battery conditioner is good.
It’s not “made for main dealers to make money”; it’s one of the many things manufacturers are doing to try and drive down the CO2 emissions and thus tax a car attracts.
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