What is the method to check if a car battery has power or not?
2 Answers
The method to check if a car battery has power or not is the light judgment method. Turn on the car's headlights and engage the starter; you can then observe the dimming degree of the lights to determine the battery's remaining charge. 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 is stopped or at low idle, it provides power to the car's electrical equipment. The maintenance methods for the battery are: 1. Start the car regularly to charge the battery; 2. When the electrolyte is low, replenish it with distilled water or a special replenishing fluid; 3. During daily driving, frequently check whether the small holes on the battery cover are ventilated.
Through years of driving experience, I've found that the most reliable way to check battery power is through daily observation. When starting the engine, if the rotation is noticeably slow or unresponsive, it likely indicates a weak battery. Turn on the headlights to check brightness - if they dim significantly or flicker, it suggests insufficient power. Also listen carefully: if turning the key only produces dry clicking sounds without engine response, it's definitely low battery. I pay attention to weather factors too, as battery performance tends to drop in cold weather, so I regularly check for corroded or loose terminal connections beforehand. Developing a habit of spending a few minutes each week checking these signals can prevent breakdowns. Batteries typically last about 3 years, so keeping jumper cables as backup and prioritizing safety is recommended.
