Does The Auto Stop-Start Drain The Battery?

To answer the second question in our 4-part series “Does the Idle Stop & Go System Really Work?”, systems and features that drain the battery when the engine is shut down are lights, sound/entertainment systems, temperature controlled options such as heated/cooled seats, the onboard computer and engaging the starter motor for starting the engine.

Gateway Kia Quakertown PA service department technicians report that when the engine is not operating, the generator is not producing and delivering power to the electrical systems or battery. When the engine is shut down, only the battery transfers power to active systems or features.


We know from the previous question that Gateway Kia Quakertown PA vehicles are installed with Idle Stop & Go systems, and they operate when the vehicle is in (D) Drive, the engine is at peak operating temperature (warm or hot), and at a stand-still idling. We also know the electrical system is powered by the engine. So, what happens to those systems when the engine is shut down or when the engine is repeatedly restarted?

Gateway Kia Quakertown PA service department explains that normally, the average driver is using the infotainment systems or enjoying the air-condition or heater. And drivers are concerned that when the engine is shut down, those systems continue to operate and draw power from the battery. Also, restarting the vehicle places a heavier load on the battery when the engine doesn’t operate long enough for its systems to recharge the battery.


Again, Kia technicians say not to worry. Kia vehicles are outfitted with heavy-duty components designed to endure the “Idle Stop & Go” system. All of Kia’s parts are reinforced for heavy workloads and designed to reduce servicing costs, especially the battery.

Even though Kia’s batteries are designed especially for extended restarts, they’re not overloaded by electrical systems such as the infotainment and comfort systems. The “Idle Stop & Go” feature monitors a dozen conditions before shutting down the engine. This is to protect the battery from being weakened. For instance, if the outside ambient temperature is too high (hot) the system is programmed to disengage and the engine continues to circulate and control coolant temperature and air-conditioner. The programming for cold weather is similar but instead of air-conditioning, the engine runs the water pumps and heater blower motor to warm the interior.

CLICK HERE FOR QUESTION #3: Do Stop-Start-Systems Really Save Fuel?

More from Gateway Kia Quakertown

Do Stop-Start Systems Really Save Fuel?

Is The Auto-Stop Bad For The Engine or Starter Motor?


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