Information site about energy storage devices
There are many reasons to remove a car battery. The battery may be dead or the car may be stored in sub-zero temperatures during the winter without any mileage. Perhaps you are handing over your equipment for repair, selling or replacing the battery. Removing the battery from a car is not difficult, but there are certain rules on how to do this without negative consequences for the equipment. The sequence of actions is prescribed in the vehicle operating instructions. Failure to follow the rules can lead to a short circuit, failure of the electronics, generator, and even electric shock to the “craftsman.”
How to properly remove the battery from a car
When working with a battery, you must remember that despite the harmless voltage, a current of 50-1000 A is generated in the car. When a short circuit is formed, a body with a negative charge becomes deadly. How to safely remove a car battery? First of all, the cathode voltage is removed - the negative wire connector. In this case, a short circuit is eliminated when connecting the positive terminal to the body with any random jumper.
The battery can be located under the hood, in the trunk or under the front seats in the cabin.
- It is necessary to free the battery from thermal insulation and protective covers.
- Make sure the terminals are clean and first remove the ground connection.
- Before removing the terminal from the car battery, you need to swing it, turning it clockwise and counterclockwise. We will do the same with the positive connection.
Now you need to free the body from the clamps and gently remove it. How to remove the battery if the car has an alarm system? This aspect must be taken into account. A completely disconnected power supply may force the ECU to be reprogrammed. It happens that the alarm goes off during the period when the terminals are disconnected, then the sound must be turned off in advance. During the battery disconnection period, the doors may be blocked. That is why the keys to a working lock should be outside the car.
Do you always need to remove the battery from your car to service it? Preventive inspection and measurements are made at the installation site:
- The voltage at the terminals is measured with an open circuit using a multimeter. When the full charge is below 12 V, the battery needs to be charged.
- The battery voltage at the terminals should be 13 - 14.4 V at full load and all consumers connected.
- The control of electrolyte in banks when using serviced devices is checked using a glass tube.
- The density of the electrolyte is determined by a hydrometer 3 hours after charging.
- The electrolyte for central Russia should have a density of 1.27 - 1.29 g/cc. In the northern regions - 1.3 g/cc.
Sometimes it is necessary to remove the battery caps to measure the electrolyte level. Lids or stoppers provide access to the inside of the jar. They can be made flush with the body. You can unscrew the part using a 5 ruble coin or another wide flat object. Before removing the plug, you should wear rubber gloves - there is electrolyte inside. When recharging old batteries from the mains, the caps must be removed.
Is it possible to rent for a long time?
Let's just say that after three to four months the battery may lose 25% of its capacity, and after six months about 50%. If such a discharged battery is left under the hood of the car for the winter, then it can actually freeze , so much so that it may rupture the case.
Therefore, removing the battery from a car, even if it is a foreign car or our VAZ, GAZ, UAZ, etc., when parked for a long time, is DESIRED! Take the battery home, leave it in the vestibule, closet, or even on the balcony, and occasionally, at least once a month or two, check its voltage. Recharge if necessary.
Of course, if you leave the car for two to three weeks, then there is no need to remove it, here you can remove the terminal , this will be enough.
What will happen to the car if you remove the battery for a long time? There is a myth going around - that all the settings will be lost, everything will be reset, to such an extent that you will almost have to download new firmware!
I can say with responsibility guys, this is a MYTH, and nothing more. All basic settings are stitched into the on-board computer and ECU forever! And they are energy independent! THIS NEEDS TO BE UNDERSTANDED. If you follow the logic of “such users,” if you remove the terminals from the battery (for a long time, for example, for a week), then all the information from the ECU will be removed, including the mileage. After all, now it is electronic and is located in the electronic control unit. BUT IT DOES NOT RESET, all because, I emphasize once again, THERE IS NO ENERGY DEPENDENCE!
It will be useful: How many years can tires be used?
Of course, your radio settings, time, date, audio equipment settings will be reset, but all this can be quickly configured and this data is not important for the operation of the car. Adaptation will also be removed from modern automatic transmissions, but after 50 - 100 km, after starting, the automatic transmission will again remember your driving style, these are the so-called adaptive automatic transmissions.
Therefore, removing the battery from the car for a long period of time will ABSOLUTELY not cause any harm to it, THIS IS A FACT. Don't believe what the professionals tell you.
To be fair, it is worth noting that there are complex, expensive (often luxury car brands, such as Infiniti, Lexus and others) where removing the battery is difficult and it is not always recommended to remove it for a long period of time. This is because they can have up to several control units in their car, and if the main one is non-volatile, then the rest have built-in small batteries that need to recharge the main one. If you remove the battery for a long time, from 2 to 6 months, then these small batteries may not be enough. After starting the car, various functions may not work, such as automatic rear seat adjustment, etc. Of course, this is also not critical, BUT IT’S UNPLEASANT!
There are not many such machines out of the total mass (literally a few percent), AND OFTEN THE OPERATING INSTRUCTIONS PROCEDURE TO REMOVE THE BATTERY COMES WITH LIMITATIONS! It's worth remembering. BUT in the remaining 95 - 98% of cases, you can shoot without fear.
Is it possible to remove the battery while the car is running?
There are situations when the battery is removed while the car engine is running. Experts say that on old Soviet-made cars, such as Volga and VAZ, you can remove the battery from a running car. In this case, you should set the engine speed to average, connect consumers to average voltage surges. In this case, it is necessary to handle the positive line carefully and ensure its 100% isolation from metal parts and the housing.
Is it possible to remove the old battery from a running car and install a backup battery? When replacing the battery on modern cars with finely tuned electronics, it is necessary to create a jumper between the two power sources. Replacing the battery while the engine is running will allow you to avoid reconfiguring the ECU, since the voltage in the control networks does not disappear. The jumper is removed last, when the new battery is secured at the installation site.
Removing the battery with the engine running
There's a debate about whether it's possible to remove the battery while the car is running? For example, not long enough to replace the battery?
If you turn on all the consumers in the car, then the risk is of course reduced. I did it myself once, well, there were no wires. and there were no other cars within a radius of 200 km either. but my heart was bleeding
We turn on the stove, headlights, mafon and off we go. I did this myself, I don’t always have the wires at hand, but I have to drive and it’s cold all around.
I did this too many times, and nothing bad happened. What could this possibly mean?
the generator will output 30 volts into the network, that’s what the threat is.
Can you be more precise about why the electronics should burn out?
task. there are two cars. Only one of the two batteries is charged. or it’s just stupid that there’s only one battery. Question: how to start both cars?
So there seems to be something there (I forgot the name, like a rheostat) that regulates so that the generator produces exactly 12 volts
This is why consumers turn on to create a load. What difference does it make who eats the generator current? I think the heater in 5th gear, high beam headlights + PTF and heated glass will just take away all his possibly spilled nonsense
