Most stop-start vehicles require a number of criteria to be met before the feature initiates. Usually, the car has to be stationary with the foot brake applied and the battery is required to have a certain amount of charge. Both the battery and the starter motor have been modified so the vehicle is able to run this way. The batteries in stop-start vehicles are designed to handle these extra loads. The starter motor is also designed with these duties in mind. Switching the feature off will neither prolong nor decrease the life of these components.