Without power, the car can't move except lying down or lying down. Many car owners have experienced that they can't start the car because the battery of the car suddenly runs out of power, and even miss major events. Afterwards, the car owners called professional technicians. The mechanic found that there was nothing wrong with the starter through inspection and finally locked the battery problem.
In other words, if the battery is useless, it needs to be replaced, and a new one is enough. So some car owners once again put their previous tragic experiences behind them after replacing brand-new batteries. I may have to wait until the next time the car won't start because of battery problems, before I remember to take the time to learn cars.
Battery life is not infinite.
The normal service life of automobile batteries is 2~4 years. If the service life exceeds 5 years, occasionally there will be no ignition. At this time, the first suspected fault point should be the battery. If the car can be started in summer, it will be difficult to start when the weather is a little cold, so replace the battery.
A hundred years ago, cars were started by hand. Modern engines are driven by starters and then start. When we insert the key and twist it, we hear the sound of "pants", which means the starter is working. This product is a "big power consumer" in the car! When the starter is working, the current can easily exceed 100A or even 200A.
Therefore, if the battery performance is good, the battery has the ability to output super current instantly. The voice of the starter "pants" sounds particularly crisp! When the key is twisted, it will bang in two seconds at most. However, after the battery is aged, the ability to instantly release super current becomes worse. So when you start the car, the sound of "bursts" becomes slow and weak.
Be careful of your battery at this time! This is a very bad signal. Your battery is telling you "it's dying". In another case, the engine clock will return to zero every time it is started, and the one-button window-raising function will fail. This situation is due to the lack of battery power when the engine is started, and the battery voltage drop is too large, which leads to the restart of the automobile computer, which is equivalent to the power failure every time the engine is started, and the battery needs to be replaced.
Self-service detection of automobile batteries
As mentioned in many articles, there is a "small window" at the top of the battery to judge the health of the battery, and the health of the battery can be simply judged by observing the color of the window. But in fact, many times, this observation window is very reliable. Therefore, it is not recommended to judge the battery condition through the observation window.
We know that in professional repair shops, technicians usually need to use a special battery detector to judge how long a battery has left. But this is impossible for our car owners. The best thing we can buy is a multimeter. Then I'll teach you how to roughly judge the battery condition with a simple multimeter.
The nominal voltage of automobile battery is 12V, and the actual voltage is higher than this. When the engine is not started, the voltage between the positive and negative electrodes measured by multimeter should be between 12.5~ 13V. If the measured voltage is lower than 12V, the battery power is low. It is difficult to start the engine at this time, and the battery needs to be recharged.
If the measured voltage is lower than 1 1.5V, the battery is basically exhausted, and the battery is not enough to start the car at this time. Even if it is charged, it is difficult to meet the prescribed standards and should be replaced.
The above measurement method only detects the approximate power of the battery, and dynamic voltage measurement is needed to further accurately detect the "super-current discharge capacity" of the battery. Connect the red and black pointers of the multimeter to the positive and negative poles of the battery respectively. People inside the car start the engine, and people outside the car observe the multimeter. If the voltage drops below 9V, the battery is basically useless.