The trouble with today’s cars with start/stop is that if the battery isn’t charged enough then it won’t stop and if you keep turning it off whenever you stop then it will not get enough charge and will kill the battery in about 6 months(it tells you this in the info about the system) and with them being special batteries for the start/stop system they cost a fortune and wouldn’t be covered under warranty as they keep a history in the battery and ECU.