Quite often in the “career” of every motorist it happens that the car has to be left on the street (or in the garage) for five or more days. The most experienced drivers, who still found Soviet cars, often recommend removing the terminal from the battery in such a situation. Do I need to do the same for modern cars?
Experienced motorists are well aware of the fact that when in the old days the car was left standing for several days, it was necessary to remove the power terminal from the battery. Does this formula apply to modern machines? In order to fully answer the question posed, one should remember why this was done before. As is often the case, in fact, everything is much simpler than it seems.
The fact is that before the battery terminal was removed for two reasons - battery discharge and not the most reliable electronics. If everything is more or less clear with the first point, then the second should be dealt with. The fact is that old or just shoddy wiring and lighting equipment could well have caused a fire if they had access to a power source. Most often, this kind of misfortune occurred precisely with old cars.
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In recent decades, cars, electronics and batteries have leaped forward. If the car has problems with wiring and equipment, then the constant access of the equipment to the battery can still cause a fire. In fairness, it should be noted that if the car really has a problem of this kind, then you need to solve them as quickly as possible by contacting the workshop for qualified help.
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But to be afraid of discharging the battery on modern machines is definitely not worth it. Moreover, it is strongly discouraged to remove the terminal for one simple reason - the electronics settings may fail.
Continuing the topic, read about why rust occurs and which cars are most susceptible to corrosion and not only.
A source: https://novate.ru/blogs/181019/52112/