This is How You Can Fix A Dead Cell in A Car Battery

Today I will show you how you can fix a dead cell in a car battery. If you follow my steps, you can do it as quickly as possible.

In fact, I fixed the dead cell in a car battery by myself. And I teched my other family members how they can repair or fix a dead cell in a car battery. That is why we don’t need to go to a professional, and we can save the cost of fixing a car battery.

After you read this post, you can fix a dead cell in a car battery easily and quickly.

Let’s dive right in :

What Are Car Battery Cells?

The cell is a single anode and cathode separated by electrolytes used to produce a voltage and current. There are many types of cells in a battery. An automobile battery is a wet cell battery. In a car, the battery has six cells connected in series.

In the car, the battery produces approximately two volts. Each cell is filled with a sulfuric acid solution, which is the electrolyte. So, Sufficient levels of acid are required for the battery, and you should always be aware of acid leaks from your battery.

The battery cells are connected to each other. Also, the car battery cells are connected by short heavy straps from the positive plates of one cell to the negative plates of the adjacent cell.

How to Fix a Dead Cell in a Car Battery

how to fix a dead cell in a car battery
How to fix a dead cell in a car battery

Most of the car battery you found in the car’s engine bay—some of the fundamental systems in a car depending on the car’s battery.

The first job of the battery is to start the engine of a car, and how it’s done is the battery provides electricity to a small electrical motor known as the starter motor.

When you’re starting a car, a battery does not only get your engine on and running, but it also starts the car’s ignition system. The car battery uses an alternator to transfer the electricity in a car. The alternator has a significant role in your car, that’s why you check your alternator for overcharging because an overcharge alternator can make your battery dead gradually.

There is also lots of work the car battery is done in a car, such as the sound system, air-conditioning, lighting in the car, etc.

Issues with a car battery cell can happen for several reasons. You could even buy a dead cell battery if you aren’t aware of battery cells and battery quality. Before Buying any battery, you should get the proper knowledge of automobile batteries.

Fortunately, car battery cells can be fixable or reconditioned. You can fix the dead car battery at home with some tools and some requirements. If you recondition your car battery or fix the dead cells in a car battery, it can add a few more years to the life timeline.

Requirement for fixing a dead cell in a car battery :

  • Protective Eye Goggles
  • A pair of Neoprene Rubber Gloves
  • Screwdriver
  • Epsom Salt
  • Battery Charger
  • Distilled Water
  • A Plastic Funnel
  • A Drill
  • Turkey Baster

Steps to take for reconditioning your car battery :

Step 1 :

epsom salt battery fix
Epsom Salt

In order to fix the dead cells in your car battery, you have to start taking procedures in the well-ventilated area.

First, you have to heat half a gallon of distilled water to the boiling point. And then, you need to add ½ lb of Epsom Salt (Magnesium sulfate) to the boiled distilled water and stir it properly until the Epsom salt is completely dissolved.

On the other hand, if you want to get things done quickly, you can also buy the battery acid from your area’s auto shop.

You can ask me how much Epsom salt to fix a dead cell in a car battery? The answer is Dissolve 7 to 8 ounces of Epsom salt in the distilled water is enough.

Step 2 :

clean car battery corrosion
Clean Car Battery Corrosion

As we know, corrosion and dirty car batteries can cause many different types of issues. Before reconditioning a dead cell in a car battery, you have to clean outside of the battery.

Use baking soda and clean water to clean the car battery terminal and outside. Baking soda and water prevent contamination from your car battery. You don’t need to worry about safety using baking soda. Baking soda is completely harmless, and this will neutralize the battery acid.


You have prepared the solution for reconditioning the car battery. If you follow further steps, you can refurbish the car battery.

Step 3 :

remove car battery cover
Remove Battery Cover

After you clean the car battery now, you have to remove the covers from the car battery cells using the screwdriver. You don’t need to be worried about removing the cover from the car battery because it’s very easy, and you don’t even need a huge screwdriver; you just need a little screwdriver. 

You also need to remove the top cover of the sealed battery using a screwdriver. If you aren’t familiar with this, you can google it or watch it on youtube.

After you removed the car battery covers, you again need to remove the plastic caps and drill the holes at impressions. Bring a damp towel and then completely remove debris surrounding the battery holes.

Remember, the metal funnel reacts with acid so, you should not use a metal funnel; instead, you can use a plastic funnel, and a plastic funnel is totally safe. Fill the battery with the solution by using a plastic funnel. And the battery should be dipped in the solution.

Step 4 :

After dipping the battery in the solution and now you can reinstate the battery cover. And you need to replace the plastic plugs and the cover.

Step 5 :

charge a car battery
Charge The Car Battery

This is the last step to take for refurbishing car batteries. Now, you just need to connect the battery terminals to the battery charger. Charge the battery slowly, at least for 24 hours.

I know there are ways to charge a car battery without a charger. But, whenever you recondition a battery, you should charge your car battery with a compatible battery charger.

I recommend You should repeat this process two to three times constantly to improve the battery life.

Now, Your battery is ready to use in your car. And, This is how you can fix a dead cell in a car battery.

Most of the time, car owners are go-to auto service centers or professionals to fix this issue in the car. But if you can do it in your home, you can save a lot of dollars. Vehicle services are so expensive, and this is going ahead, and expenses are growing rapidly.

The battery reconditioning process is straightforward. And In this post, I shared how to recondition a car battery at home. So you can fix dead cells in car batteries at home quickly. You should always be aware when you are buying a car battery from a store.

Now, you need to know some safety measures in order to know how to recondition batteries at home.

Safety Measures To Fix a Dead Cell in Battery :

As an Auto professional mechanic, I always recommend whatever you do to your vehicle, you should take proper safety measures. Even if it’s such a simple job in your vehicle, you should take proper precautions.

Below I’m going to share the precautions while you work around with your car battery.

battery safety precautions
Battery Safety Precautions

You have to wear protective gear

Always wear the appropriate Personal Protective Equipment (PPE), especially when you work around the car battery. Such as gloves, safety glasses, goggles, or face shield. A little bit of acid can burn your hands, and acid can spill on your eye.

You also think about your body. Wearing an apron is a must when you work in a car battery. This will protect you from dirt and other harmful ingredients.

You must Avoid touching your eyes while working on a battery. If accidentally anything pours in your body, you should immediately clear it using clean water.

Compatible Battery Charger

Car battery chargers restore energy to a car battery through electronic current. You will find many car battery chargers in a store, but you have to buy a compatible battery charger for your car. You can’t use a charger that is not required or suitable for your car battery.

You need to select the right charger for your car battery and charger that works well with 12 V batteries. Compatible car battery charger required for rejuvenating car battery.

Another thing you always make sure of is don’t overcharge a car battery. Overcharging a battery can cause huge damage to your car battery life.

Although there are many ways to charge a battery, I highly recommend you charge your car battery with a compatible car battery charger.

You have to check the voltage

The standard automotive battery in modern vehicles is a 12-volt battery. Each battery has six cells, and each cell with 2.1 volts at full charge. A good car battery should read 12.4-12.9 volts when the car is off.

In order to recondition a car battery, you need to make sure that your car battery voltage is below 12.4V. And 12.4V indicates that two or more cells are already dead in your car battery.

10V to 12V is suitable to go for reconditioning, but if your car battery’s voltage is below 10V, this is not ready to recondition. If you notice that your car battery voltage is below 10V, this indicates that your car battery already has any kind of technical issue.

Your battery storage area should be checked

Whether you are trying to bring back a dead car battery or just doing little work around your car battery, you should store the battery safely where it is not exposed to direct sunlight.

When you are restoring the battery, make sure the battery is not exposed to direct sunlight. After you finish the reconditioning battery, you should not store the battery in a hot location or even an area where sunshine rays receive directly.

What Are The Symptoms Of Dead Cell in Car Battery

A 12-Volt car battery has six cells, and these cells produce voltage and amperage to start your car engine. If the car battery’s cells are dead, your car battery will not provide sufficient amperage or voltage to your car. Car battery cell failure is the most common type of battery failure.

Here are some symptoms of dead cell in a car battery that you can look and tell :

battery cell
Battery Cells In Car Battery
  1. Car engine cranking slowly
    Cars need a sufficient amount of speed to start the engine. The car creaking engine is turning the engine crankshaft that rotates the engine to power in the car. If your car engine is slowly cranking, this might be a symptom of a dead cell in the car battery. If the car battery cells are affected, then your car engine will creak slower than usual when you start the engine.
  2. Car dashboard light
    Car dashboard job summarizes these car’s working events with easy-to-understand and real-time data visuals. If your car dashboard lights dim, this also indicates that your car’s battery cells are going to die or your car battery needs to charge.
  3. Dim car’s headlight
    Noticing the car’s headlight is the most common and easy way to indicate that you have a dead cell in the car battery. If your car’s headlights are dim, you should check the car battery.
  4. Clicking sound
    Whenever you turn on the ignition, if you hear a clicking sound, this can be a sign of an issue with your car battery. Hearing clicking sound when turning the ignition on is also a symptom of dead cells in a car battery.
  5. Need to push Accelerator
    The Accelerator is also known as a gas pedal. If your car would not start unless you push the Accelerator to start the engine, there is also a chance the car battery needs to be checked.
  6. Car Stop
    If the car suddenly stops running after you have started, this sign indicates that either your car needs to charge the battery or your car battery is dead. In this case, you should check the battery and get help from a professional but don’t be late.

What Causes a Dead Cell in a Car Battery

There is no denying that having a dead cell in a battery is useless to running a car. Everybody should know how to do car battery cells die. If you want to run your car, you need to fix a dead cell in the car battery or make a dead battery work again as soon as possible.

Here is some reason why do car battery cells die :

  • Age of a battery
    The age of a car battery is a significant factor for battery health. The car battery cell is composed of electrodes. The battery cell will run out of call’s chemicals over time, and the car battery cell will become unable to sustain the capacity. An old cell in a battery can cause a dead cell in a car battery.
  • Sulfation in battery
    Sulfation in car batteries means when a lead-acid battery is deprived of a full charge, while sulfation occurs in the battery. Car batteries use sulfuric acid as their electrolyte. The long leisure time allows the car batteries to get a full charge overnight. The longer the battery sits without being recharge, the more sulfate it will develop in the battery.
  • Corrosion in car battery
    Corrosion is always bad for every type of battery. Corrosion can kill car battery cells. There are many reasons why car batteries terminal being corroded. Corroded car batteries can not last a long time. To keep the car battery terminal clean or corrosion-free, you have to look up your car battery regularly. Corrosion can damage car battery cells.

Final Thought

Before you fix a dead cell in a car battery or recondition a car battery, you need to be certain that your car battery needs to be reconditioning. If you are not sure about this, you may get professional help to know that. 

You should also check the voltage of your car battery. If your car battery drops around 10V below, then you need to recondition the car battery. And check the manual, see the battery types and battery specifications.

And if your car battery requires reconditioning, make sure you take all safety procedures before you start working around the battery. Always remember that anything you do is not equal to your life.

Now It’s Your Turn

I’d love to hear from you.

What is the main cause of your car battery cell death so quickly?

Let us know in the comment below.

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