No one is safe from discovering their car with a dead battery in the morning. The worst with batteries is in the winter. Even completely reliable cells full of energy are under attack. The battery will discharge continuously unless you take special measures. Fortunately, nothing difficult (almost) will not have to be done. The issue with discharge in the cold is resolved in just 15 minutes.
We identify the fact of a leak
In order to identify the location of the energy leak from the battery, you will need a pair of nylon ties and a multimeter. So, the multimeter is switched to the current measurement mode with a measurement limit of 10 A. Immediately after that, it is connected to the gap in the negative terminal of the battery. In this case, the probes are fixed with ties.
Important: The optimal current consumption of the machine is 20-50 mAh at rest.
During the measurement, it is recommended to simulate the closing of the driver's door. To do this, you need to open it and then turn off the limit switch. You can also open the lock with a screwdriver. After that, the car is armed. The current should be very high at first, but gradually it will start to drop. This takes 10-15 minutes depending on the state of the electronics.
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What to do if there is a leak
If, after 10-15 minutes, the current does not fall to the optimal consumption at rest, then there is a leak. In order to find its source, you should refer to the mounting block in the cabin. We pull out the fuses one by one and look at the indicators of the devices. As soon as after pulling out one of the fuses, the current drops to normal, it will be possible to say with confidence that this particular system is "leaking".
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Next, we use the fuse table and find the problem unit from it. Most often it is an unfortunate radio tape recorder. The detected damage will need to be eliminated independently or with the help of a wizard.
Continuing the topic, read about how to charge a car battery if the charger is not at hand and not only.
A source: https://novate.ru/blogs/251219/52853/