Why is the car battery dead when jump-starting?
2 Answers
The reasons why the car battery is dead when jump-starting are: 1. The vehicle has been parked for a long time, and the power in the battery will continue to discharge, resulting in a depleted battery; 2. The car battery has reached the end of its service life. When the color inside the car battery is white, it indicates that the battery's service life has ended; 3. The car engine's belt is loose, broken, or the generator's wiring is broken or the connection is loose; 4. Insufficient battery electrolyte leads to inadequate power storage. During daily use, the electrolyte will evaporate, so the owner needs to check the remaining electrolyte level in time; 5. The car battery has been used for too long, and the battery terminals may corrode, causing the car battery to lose power. It is necessary to check the battery and address the corrosion promptly.
There are quite a few common reasons for a car battery running out of power, and I've dealt with many similar situations myself. For example, battery aging leading to reduced capacity, especially after more than three years of use; forgetting to turn off the headlights or interior lights overnight can drain it; alternator failure preventing normal charging; extreme hot or cold weather impairing battery performance. When you find the battery dead, don't panic. First, check the light switches to make sure they're off, then use a simple voltmeter to test it. If the reading is below 12 volts, the battery might be faulty. You can ask a friend for a jump start or call roadside assistance. For prevention, regularly check the battery terminals and fluid levels, and clean corrosion to avoid poor contact. Driving habits are also important—avoid running the air conditioner or radio while idling. If the problem keeps occurring, get a comprehensive check of the charging system at a repair shop as soon as possible.
