How to Fix a Dead Battery on a Car

Do you have a car battery that is no longer functioning or has completely stopped working? Here is how to repair a depleted automobile battery. Discover additional information on how to effectively preserve your car battery to extend its durability.

Have you ever experienced a situation when your car battery was completely discharged? If you own a car, this is a problem you have likely encountered.

While cars are often intended to continuously charge their batteries for ongoing power, there may be certain exceptions. When you have a dead car battery, it can be frustrating because it can leave you stranded in a remote location. In certain situations, it may be entirely lifeless, while in other others, it is simply feeble.

However, in all situations, unless you are aware of how to resolve the issue, you will be left without a solution. Here are methods to repair a dead automobile battery.

Typical Indications of a Depleted Vehicle Battery

6 typical indications of a depleted vehicle battery

There are multiple indications of a car battery that is no longer functioning. These are symptoms that could vary according on the battery’s health.

Old battery

A car battery is not intended to have an indefinite lifespan. Consequently, it will mature over time. As the average battery ages between 4 to 6 years, its performance decreases.

The battery will be unable to start the car. In many instances, the battery will gradually deteriorate due to difficult starts and eventually cease to function entirely. In this kind of case, the sole option is to substitute the battery.

Nevertheless, specific steps can be implemented when utilizing your automobile battery to prolong its lifespan through maintaining adequate upkeep. When you go to Battery Globe, you can gain a better understanding of how to maintain automotive batteries.

The battery has an odor similar to that of rotting eggs.

If you detect a scent similar to rotten eggs coming from your battery, it indicates that the battery is no longer functional. This is a result of lead-acid batteries containing sulphuric acid (H2SO4) and water. While the battery is charging, it may generate H2S, which emits an unpleasant odor similar to rotten eggs.

Therefore, if you detect such an odor, it indicates that the battery has lost its charge. This also indicates that the acid has begun to flow out and create hydrogen sulfide gas.

Corrosion of terminals

Another indication of a fading or dead battery is the presence of corroded terminals on your battery. You will observe a white or blue powder on your battery connections.

As rust accumulates, it indicates a deteriorating battery. Because of this deposit, the car will struggle to start and eventually stop working entirely.

Dim or Failed Headlights

Car headlights also need power. When a battery has limited power, it is insufficient to power the headlights, resulting in dim or no light.

If a battery is unable to power the headlights, it will also be unable to start the engine. If the engine cannot start, and you attempt turning on the headlights and observe this, then know your battery is dead.

Enlarged Battery

An enlarged battery is a clear indication of a failing battery. The sole resolution for this situation is to substitute the battery. Typically, an enlarged battery is the result of a defective alternator that over charges it. Whenever this occurs, it needs to be replaced.

The car is not starting.

A car not starting is a typical indication of a battery that is dead or dying. If the automobile does not start when the ignition key is turned on, it means that the battery is either dead or dying and is unable to supply sufficient power.

How to repair a dead car battery

If you have a fully depleted battery, it cannot be revived or repaired. You need to replace it. Nevertheless, if you encounter a battery that is dying or weak, there is potential for a solution.

The following mentioned techniques will assist you in resolving the issue of your battery’s low charge or weak performance temporarily.

Utilize a slow charger.

This is a simple method, but it’s important to note that it will take a significant amount of time for your depleted battery to be fully charged. When utilizing a trickle charger, it may require up to 48 hours for the battery to reach its full charge. This is because the charger generates only 1-2 amps.

Nevertheless, the benefit of this gradual charging is that it safeguards the battery from excessive charge or excessive heat.


The initial action is to switch off your vehicle.

Select a suitable parking spot without any disruptions as you won’t be able to relocate the vehicle once the procedure commences.> It is beneficial to store the car in a garage that has proper airflow and protection from precipitation. Note: In this procedure, there is an overproduction of hydrogen gas. Therefore, adequate ventilation is necessary. When hydrogen becomes highly concentrated in a confined space, it has the potential to explode. Ensure that the ventilation is adequate.

Locate the lower section. The bare metal component of the frame will be connected to the engine block or chassis. It might also be a big bolt.

Next, we need to connect the cords. Ensure that you correctly identify the positive and negative terminals. Connect the red cable to the positive terminal and the black cable to the ground position. Avoid connecting the black cable to the negative terminal in any way.

Double-check to ensure the connection is correct. Now connect your charger and then turn on the charger to begin charging.

Additionally, verify the display on your charger to confirm that it is charging.


Start an automobile using another car

Start an automobile by utilizing another car Preparation

Purchase an additional vehicle and acquire a set of jumper cables.

The cars must not make contact with one other. Make sure that all the engines are turned off. Procedure.

Connect the red cable to the positive terminal of the Dead Battery.

Connect the red cable to the positive battery connector of the functional battery.

Connect the black cable to the negative terminal of the functional automobile.

Next, connect the black cable to a metal component that functions as the negative terminal on the malfunctioning vehicle. Do not connect the black cable to the negative terminal of the battery as it could cause an explosion.

Start the vehicle engine

Now, please wait for approximately 1 to 2 minutes.

Please attempt to start the engine of the malfunctioning vehicle. Next, detach the connected cords. Ensure that you disconnect in the opposite sequence of how you initially connected.

Allow the car with a faulty battery to run for a maximum of 20 minutes in order to recharge it.

For visual demonstrations of this technique, view this YouTube video.

Utilizing a Portable Jump Starter

There is no major difference between this process and utilizing another automobile to jumpstart. However, in this case, it is more convenient as you may keep the portable jump starter in the car.

These are the instructions to follow.

  • Make sure both the jump starter and the automobile are turned off.
  • Locate the ends of the battery.
  • Attach the Red cord to the positive terminal of the battery.
  • Attach the black cable to a metal component that is connected to the ground, such as the engine block or automobile frame.
  • Activate your jump starter and begin the car’s engine.
  • Allow the vehicle to operate for a few minutes.
  • How to take care of your car battery
  • An effective battery is essential for any car. It is important to ensure that one takes proper care of their battery in order to prolong its lifespan. Here you will find all the guidelines to follow to achieve this.
  • Clean the terminals regularly and use a dielectric grease or anti-corrosion solution. This will help to avoid corrosion on the battery terminals.
  • Ensure that you frequently inspect the electrolyte level and add distilled water as needed.
  • When the car is not in operation, ensure that you deactivate any accessories and disconnect any appliances.
  • Avoid leaving the automobile running for an extended period without driving. Driving frequently to recharge the battery.
  • Regularly monitor your battery voltage and make sure it is at a level of 12.6 volts.
  • If you don’t plan on using it for an extended period of time, connect a trickle charger.

Final thoughts

To determine if the battery is dying or dead, you need to observe the symptoms mentioned above. They will assist you in determining if you need to repair or replace the battery.

The methods outlined for repairing dead automobile batteries are effective for batteries that are fading, but not for batteries that are completely dead. Ensure that you properly care for your automobile battery in order to prolong its longevity





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