What are the reasons for a car battery running out of power?

1 Answers
CarolineDella
07/29/25 6:34pm
There are generally several reasons for a car battery running out of power: 1. The car has been parked for a long time, causing the battery to discharge: Even when the car is not in use, the battery will still discharge due to its inherent discharge characteristics. Most modern cars are equipped with anti-theft systems that operate even when the vehicle is parked, requiring a certain amount of power. Additionally, alarm systems will trigger when external forces act on the parked vehicle, consuming even more power. 2. The battery has reached the end of its lifespan: Most private cars now use maintenance-free batteries. By cleaning the battery's inspection window and observing the color inside, you can determine its status: green indicates the battery is normal; black indicates low voltage and insufficient charge, which can be resolved by charging; white indicates the battery has reached the end of its lifespan, and the only solution is to replace it with a new one. 3. Engine damage: The car's alternator belt may be loose or broken, preventing it from driving the alternator. The alternator contains a rectifier, and a sudden high current can burn out its diodes. Additionally, worn-out carbon brushes and slip rings can lead to poor contact. The stator coil may also experience short circuits or open circuits, causing the alternator to stop working. The rotor coil can also have open or short circuits, preventing power generation. Furthermore, broken generator wiring or loose connections can result in the car battery only discharging without charging, leading to a dead battery.
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