Can a car charge its battery while starting?

[IvanLee]

When a car starts, it runs at idle speed, which can charge the battery. However, this requires ensuring that all electrical devices in the car are turned off (except for the engine). The battery will charge automatically, but this only happens when the car is running, relying on the alternator for charging. Alternator output voltage: The alternator's output voltage is directly proportional to its rotational speed. The alternator's speed depends on the engine's speed. During the car's starting phase, the speed is relatively slow, resulting in a lower alternator output voltage. Only when the engine operates continuously and normally will the battery receive better replenishment. Jump-starting the battery: If a car has been parked for an extended period, the battery may lose charge. If the car fails to start, jump-starting the battery is an option. Connect the battery terminals of both cars using jumper cables, then start the other car to let its engine idle. Next, attempt to start the affected car. If the issue is a depleted battery, the car should start quickly, after which the alternator will begin charging the battery.