What are the reasons why a car always runs out of battery?

2 Answers
JesseLee
07/28/25 11:10pm
The reasons why a car always runs out of battery are: 1. The car has been left unused for a long time, during which the battery self-discharges; 2. The electrical appliances inside the car were not turned off during use, resulting in prolonged discharge; 3. The car battery has aged. The functions of the battery are: 1. When starting the engine, the battery supplies power to the starting system, ignition system, and electronic fuel injection system; 2. When the engine stops running or is at low idle, it powers the car's electrical equipment; 3. When the generator's output is insufficient, it can assist in supplying power to the electrical equipment; 4. It mitigates voltage surges in the electrical system, protecting the car's electronic devices; 5. It can store excess electricity generated by the alternator.
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WillowLynn
08/12/25 3:34am
Hey, let me tell you, last week my car wouldn't start for two days in a row. Turns out the wiring was messed up during the audio system modification, and it kept draining the battery even after turning off the engine. If you've got devices like a dash cam or GPS in your car, make sure the wiring is connected to the ACC position. Short trips make it worse—the battery consumed during each start-up can't be fully recharged in just ten minutes. It's even tougher for those of us living in old neighborhoods without garages. Parking outdoors in sub-zero winter temperatures cuts the battery capacity by 30%. Remember to take a long drive every couple of weeks to recharge the battery. And if your battery's over three years old, don't skimp on replacing it.
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