Useful Tips

Which terminal should be removed from the car battery first?


Removing the battery, many drivers follow their unique algorithm, which runs counter to safety requirements. The number of errors that unknowingly are made by car owners includes the wrong procedure for removing terminals. So what kind of clamp do you need to disconnect in the first place: negative or positive?

The question of how to remove the terminals from the battery is akin to the chicken and egg dilemma. Self-proclaimed experts in the field of automotive electricians conduct fierce debates on the Internet around the clock on this subject, reproaching each other for ignorance. And why only do they spend their precious time on meaningless discussions when everything is spelled out in the manuals for the operation of the machines? Oh yes: nobody reads them today ...

The process of dismantling the battery can not be called very complicated if the battery does not have any serious damage. To remove the battery, just take a regular adjustable wrench and a rag. Just in case, you should prepare an alkaline deactivator. You will be very happy when the liquid electrolyte spills and the acid gets on the skin.

Before you remove the battery, you must turn off the ignition and all the electronics, as well as close the doors and windows in the car. The next step, according to safety, is to remove the protective cover that prevents the accumulation of dirt and moisture on the device. If not, insulate the plus with a technical tape or plastic cap.
Loosen the mass nut, which is usually screwed to the negative. And finally, remove the terminals: first negative, and only then positive. If you neglect this rule and do the opposite, you can provoke a short circuit by inadvertently attaching a key to the car body. And there it’s not only not far from the “injury” of the battery, but also before the failure in the “brains” of the car.

Installing the battery in a regular place is performed, respectively, in the reverse order. First of all, you should "fasten" the battery to stationary fasteners. Next, you need to connect the positive terminal to its contact and tighten the nut tightly with a wrench. And only after that it is allowed to carry out the same manipulations with the "minus".

However, this is all a theory. As actual practice shows, there is no fundamental difference in which terminal to remove from the battery first - the risks of damaging cars are extremely small. Nevertheless, the operating manuals, coupled with safety precautions, instruct car owners to do just that. Why try your luck if, as you know, once a year and a stick shoots?

Safety when removing the battery from the machine

The use of large force impacts on the battery during its removal is not allowed. If something "jammed", it is better to carefully examine the battery and the surrounding space: it is possible that it will not require physical strength, but a certain skill.

If the batteries do not have serious damage, they can be removed easily: use a regular adjustable wrench and a rag. Of course, you need to be very careful with the battery: do not push, do not throw, and carefully put the removed battery on an even safe place to avoid overturning it.

Remember to prepare an alkaline deactivator just in case if liquid electrolyte spills and acid gets on the skin. With maximum accuracy, this should not happen, but it never hurts to be safe.

The procedure for removing the battery from the car

So, the battery is removed from the car in a certain order:

  • Turn off the ignition .
  • Turn off all electronics in the car working without ignition.
  • Close all windows, doors in the car .
  • Unscrew the cover to prevent accumulation of dust and dirt on the battery terminals .
  • Disconnect ground , in case the machine was previously grounded.
  • There are batteries with a protective cover, and without it. If there is no protective cover, to prevent short circuit insulate the plus with a technical tape or use an ordinary plastic cap - this will secure the further process of removing the terminals,
  • Gently loosen the mass nut with a wrench. .
  • Now disconnect the terminals . The main question is which terminal to remove from the battery first? There is a strict rule: first remove the negative, and only then the positive terminal is removed .
  • Do not allow the positive pole to contact the metal parts of the machine. .

An important technical point: the negative pole must be disconnected first because it prevents the occurrence of short circuits due to the fact that the mass remains without potential.

Mass is called nothing but the car body, which is connected to the negative terminal of the battery. When removing this terminal, the battery is first disconnected from the body. The electric circuit going from the negative potential of the battery to the car body is temporarily broken, and a short circuit will no longer occur.

As you can see, it is not difficult to remove the terminals from the battery - the main thing is not to overdo it with the use of force. And when removing, be extremely careful so as not to confuse the polarity and prevent a short circuit in the electrical circuit, which can be fatal.

Next, take the necessary steps (either replace the old battery with a new one, or charge it), and then proceed with installing the battery back. Directly in front of it, strip the terminals with soda and a hard brush, and if there is any deposits on them, remove them with distilled water. Do not use plain water to avoid the formation of salts.

Putting the battery back in the car

When installing the battery back in the car, the specific connection procedure must also be followed.

Remember that the battery must be connected to the machine in the reverse order:

  • return the battery to its original place ,
  • attach it with a standard mount ,
  • now the terminals are connected in the reverse order - first connect the terminal with a plus sign to its “native” contact ,
  • tighten the nut with an adjustable wrench ,
  • and only after that the same should be done with the negative terminal .

Restore on-board car settings

In addition, it is necessary to make sure that all the “on-board electronics” of the machine, with the help of which it is monitored and controlled over its service systems, does not go astray and does not have to be restored again. When the battery is disconnected, all parameters are reset automatically.

The experience of motorists, developed during communication with modern cars, abundantly stuffed with various kinds of electronics, helped to draw up the following algorithm of actions:

  • start the engine , bring his work to the usual temperature,
  • turn off the engine ,
  • remove the terminal with a minus sign wait three minutes
  • put her back ,
  • do the same with the plus terminal ,
  • start the engine again, let it run for 15 minutes - during this time, the computer system will restore all the basic data,
  • turn off the ignition - after turning it off, all information will be saved,
  • start the engine again , test it in all possible modes,
  • again turn off the ignition and wait until the system records all the parameters.

Now all the basic settings connected earlier work fine. This action algorithm for restoring the basic data of the car's on-board system is recommended by drivers, regardless of which brand of car is used. For verification, you can try it on any machine and evaluate how it is really effective. The main thing is not to forget about the rules of polarity and the procedure for working with terminals.

In the process of interacting with the battery, the main thing is not to forget how to remove the terminals correctly and in what order to install them back. A correctly removed and correctly connected battery will not cause any unexpected breakdown in the form of a short circuit. And if you still manage to master the independent restoration of the electronic support system, we can assume that the full control of a modern car has been mastered.

Safety precautions

For a beginner who is first removing the battery from the machine, it is unclear which terminal is removed first from the battery. It is important for him to build step by step the whole chain of actions: what to do first, and what then. There is nothing complicated in this procedure if you strictly observe safety precautions and the sequence of actions.

To remove the battery, you need to use a wrench and a rag. The battery must not be pushed and turned over, as particles deposited on the bottom of the battery can get on the surface of the plates, which will lead to a short circuit and failure of the device.

The electrolyte contained in the battery must never come into contact with the skin. But if this happens, you need to wet your hand in an alkaline deactivator.

Battery Removal Procedure

It is important to remember how to remove the terminals from the battery. There is a certain procedure that needs to be performed. In this case, do not forget about safety. The sequence of actions is as follows:

  • First turn off the machine.
  • Turn off all electronic devices.
  • Close windows and doors: if the car has power windows, it will be impossible to raise the windows after removing the battery. Doors will have to be closed manually with a key.
  • Remove the cover protecting the battery terminals from dust and dirt.
  • If there is no cover, it is necessary to insulate the positive terminal with electrical tape.
  • Remove ground, if equipped.
  • Loosen nuts with a wrench.
  • Discard the negative terminal, then the positive.
  • Do not allow the positive terminal to come in contact with metal objects.

An important technical point: the first thing to turn off is the minus, so that there is no short circuit.

The car body, it is also called the mass, is connected to the negative terminal. When it is removed, the circuit breaks and a short circuit cannot occur, since the battery is disconnected from the body.

Thus, it is not difficult to remove the terminal from the battery. It is only necessary to strictly follow the sequence of actions.

Next, you need to perform the necessary actions: recharge the battery or change it to a new one.

Connect the battery to the car

Immediately before installing the battery, it is necessary to clean the terminals with a brush. If dirt forms on the surface of the battery, remove it with distilled water. You cannot use ordinary water, as plaque may form from it.

Connect the battery in the reverse order:

  • Replace the battery.
  • Tighten the mount.
  • Fit the plus terminal.
  • Tighten the nuts with a wrench so that the structure fits snugly against the battery.
  • Only then connect the minus.
  • Which terminal to remove first is a minus. When connecting the battery back, first connect the "plus".

Electronics Setup

After the battery is connected, you need to adjust the on-board electronics, since after removing the battery, all settings are lost. For most vehicles, the steps are as follows:

  • Start the engine and warm it up.
  • Stop the car.
  • Remove the negative terminal, wait two minutes.
  • Put her back.
  • Do the same with the plus terminal.
  • Start the car again, let it idle for 15 minutes.
  • Turn off the ignition, while all data is saved.
  • Re-start the car, test all electronic systems.
  • Turn off the ignition and wait for the system to record all parameters.

As a result, all on-board settings will be restored. This sequence of actions is suitable for all machines, regardless of brand.

Thus, in the process of installing and removing the battery, the main thing is not to confuse the sequence of actions, then a short circuit will not occur. If you learn to restore the on-board settings of a car, then full control of a modern car will be mastered.

Interesting facts about the battery

Batteries work due to a chemical reaction that occurs in their case. The chemical process makes electrons move from the negative pole to the positive. Over time, the battery wears out. When charging the battery, the user seems to reverse the chemical reaction with the help of electricity.

The cost of electricity for the production of the battery is 50 times more than the energy that is released during the work produced by the battery.

The battery has a “memory". If it is not fully charged (for example, up to 80%), then it will simply forget about the remaining 20%. Even if you subsequently charge it to 100%, then the capacity will still be 80% of the original, and 20% simply will not be used.

All batteries "die" over time: this is inevitable, as the chemical reaction inside degrades and ceases to occur.

One battery from the phone can pollute a third of the Olympic pool or 600 thousand liters of water.

The battery must not be allowed to lie idle. You need to constantly use it and recharge, otherwise the degradation of the battery will occur faster.