Can a car charge the battery while idling in place?

[DanielaLee]

When a car is idling in place after starting, it can charge the battery. However, the electricity charged in this way is commonly referred to as "floating charge," which exists for a short period and will dissipate if the car is parked for a slightly longer time. If the battery charging indicator on the dashboard is not lit, it means the car is charging. If it stays lit, it indicates a charging fault, and the car should be taken to a repair shop for inspection. Below is an introduction to charging while idling: Operating principle of charging: Essentially, the engine drives the alternator (generator) to generate electricity, which is then rectified and stabilized to provide a certain voltage to the battery. Most of the time, this voltage is slightly higher than the battery voltage (e.g., 14V, while a normal battery is typically 12V), achieving constant voltage charging. Introduction to idling in place: Idling in place refers to a condition where the engine is running but the car is not moving, with the gear in neutral. This is often described as "working without output," consuming fuel without moving the car. The charging duration can also be affected by other factors, such as whether high-power devices are being used in the car, whether the air conditioning is on, or whether external USB power is being supplied. These factors can all increase the charging time.