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How long should I run the engine to prevent the car battery from dying?

2 Answers

Jonathan

09/05/25 7:45am

To prevent the car battery from dying, the engine should be charged in time. Here is relevant information about fully charging the engine when the car battery is low: 1. Determining when the engine is fully charged When the car battery is dead, the car's alternator needs to be used to fully charge the battery. The car engine must maintain a speed of over 2000 RPM, which is equivalent to driving continuously for at least 4 hours. If the engine is only idling for 10 minutes, it can charge the battery to about 6% of its capacity. This means that idling the engine for 10 minutes after the car has been parked for a week can ensure sufficient battery charge. 2. The role of the car battery: The car battery is a relatively vulnerable component. With each charge and discharge cycle, the battery's performance deteriorates. Under normal circumstances, with proper usage habits, a battery can last 3-4 years, and its lifespan can even be extended. If the car is not used for a long time, it is recommended to disconnect the negative terminal of the battery. This prevents the battery from activating its protection function and discharging, thereby avoiding battery drain. Prolonged battery drain can lead to the battery becoming completely unusable.

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DeGeorge

09/17/25 7:58am

As an ordinary person who drives frequently, I would first check the battery condition when encountering such a situation. If it's just a short stop and you're worried about the battery running out, starting the engine and letting it run for 15 to 20 minutes is usually sufficient. However, don't just let it idle in place; it's better to drive a few kilometers on the road to get the engine RPM up, so the alternator can effectively charge the battery. Pay special attention in winter, as cold temperatures can weaken battery performance. Therefore, I make it a habit to drive an extra 5 to 10 minutes in low temperatures to prevent unexpected stalling. Additionally, if the car frequently runs out of battery, it might be due to an aging battery or electrical issues. It's advisable to regularly check the battery's health at a repair shop rather than waiting until you're stranded. Overall, prevention is more reliable than temporary fixes.

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