How long does it take to fully charge in idle state?

[DiMalia]

When the car is in idle state and the battery is depleted, it only takes about half an hour of idling after jump-starting to fully charge the battery. However, the charging current will be relatively small. Here is some extended information about car charging: The essence of car charging: The charging process essentially involves the engine driving the alternator (generator) to produce electricity, which is then rectified and regulated to provide a certain voltage to the battery. Generally, this voltage is slightly higher than the battery voltage. Battery indicator on dashboard: There is a red rectangular battery symbol with +- signs on the dashboard. If this indicator light turns off after starting the vehicle, it means the engine is charging the battery. If the light remains on, it indicates no charging is occurring.