How Long Is Appropriate for Idle Charging?
2 Answers
Generally, car batteries are rarely charged when completely depleted, so charging times vary for different vehicles. If the car is indeed in a completely discharged state, it typically requires about 12 hours of charging, with the exact time largely dependent on the battery. Additionally, starting the car battery requires approximately 20 hours of charging. Below are some relevant details: 1. Alternator Charging: Modern cars use alternators for charging. The battery's power is primarily used to start the car, which consumes a significant amount. However, once the engine is running, the battery's power is no longer depleted. The power consumed during startup is replenished through the car's switching circuit. Charging can occur during idle, but the charging current is relatively small. 2. Precautions: While the car is running, the generator continuously charges the battery, so there is rarely a need for dedicated charging. However, if the battery is severely depleted due to unforeseen circumstances, it is essential to charge it promptly and not rely solely on the car's charging system. Generally, after the car engine is turned off, all related equipment should be promptly switched off to prevent severe battery depletion.
The idling charging time depends on the battery condition and environment. From a safety perspective, the risk of carbon monoxide buildup is high, so never do this in enclosed spaces like garages or underground parking lots. The charging efficiency at idle is actually very low, wasting fuel and increasing wear. Generally, keep it to 20 to 30 minutes each time, find a well-ventilated place, and ensure good air circulation. If it's just to maintain battery charge, like after short winter drives, 15 minutes is enough. Long-term reliance on idling charging can harm battery life, leading to overcharging or undercharging. I recommend keeping a portable charger handy—it's convenient, fast, and saves fuel. Safety first; it's not worth the risk. Regularly check battery voltage and develop good habits.
