How to Fix Dead Cells in a Car Battery

Dead battery cells can be a real pain. It can leave you stranded, and it’s not exactly a cheap fix either. But before you toss the whole battery and head to the store, know that fixing dead cells is possible in some cases. In this article, we’ll guide you through the process of identifying and fixing dead cells in your car battery, so you can save some money and maybe even extend the life of your battery.

How to Identify Dead Cells in a Car Battery

The first step in fixing dead cells in a car battery is to identify them. While this might sound simple, it requires a bit of knowledge and the right tools. Here’s what you’ll need:

  • A multimeter: This handy tool is essential for measuring voltage.
  • A battery tester: This tool is specifically designed to test car batteries and identify problems like dead cells.
  • A battery hydrometer: This tool measures the specific gravity of the electrolyte in each cell of the battery.

Once you have these tools, you can start the inspection process. You can usually find a detailed guide in your car’s owner manual, and if not, there are countless resources available online. But here’s a general overview:

  1. Check the battery terminals: Make sure they are clean and tightly connected. Any loose connections or corrosion can cause issues that mimic dead cells.
  2. Measure the battery voltage: Using a multimeter, check the voltage of the battery when it’s fully charged. A fully charged battery should have a voltage reading of around 12.6 volts. If it’s significantly lower, it could be a sign of dead cells.
  3. Test the battery with a battery tester: This tool will provide a more comprehensive assessment of the battery’s health. Look for any warnings or error messages indicating dead cells.
  4. Measure the specific gravity of the electrolyte: This step involves using a battery hydrometer to measure the specific gravity of the electrolyte in each cell. Dead cells will have lower specific gravity readings.

If you’re getting readings that suggest dead cells, then it’s time to consider your options for fixing the problem.

Can You Fix Dead Cells in a Car Battery?

Unfortunately, the answer is not always a simple yes or no. It really depends on the severity of the problem and the type of battery you have. Here’s a breakdown of the situation:

  • Lead-acid batteries: This is the most common type of car battery. While you can’t fix dead cells in a lead-acid battery, you can sometimes revive a battery with weak cells by using a battery charger. This method can sometimes temporarily restore a battery’s power, but it won’t address the underlying issue of dead cells.
  • Lithium-ion batteries: These batteries are becoming more popular in vehicles, offering higher power density and longer lifespans. However, fixing dead cells in a lithium-ion battery is even more challenging than in a lead-acid battery. In most cases, a dead cell in a lithium-ion battery is a sign that the battery needs to be replaced.

How to Fix a Car Battery With Dead Cells (If Possible)

If you have a lead-acid battery and you’re dealing with weak cells, there’s a chance you can revive it. However, this is a temporary fix, and the battery will likely need to be replaced soon. Here’s how to do it:

  1. Disconnect the battery: This is the most important step! It’s crucial to disconnect the battery before attempting any repair.
  2. Charge the battery: Use a battery charger designed for lead-acid batteries and follow the manufacturer’s instructions carefully. It’s best to charge the battery for several hours, even overnight.
  3. Check the battery voltage again: After charging, check the battery voltage again. If it’s still significantly lower than 12.6 volts, the battery may be too far gone.
  4. Add distilled water: If your battery is a flooded lead-acid battery, you can add distilled water to the cells if the electrolyte level is low. This will help the battery function better.

Important Note: Adding distilled water only works for flooded lead-acid batteries. Do not add water to a sealed lead-acid battery or any other type of battery.

When to Replace Your Car Battery

If you’ve tried the above steps and your battery is still not holding a charge, it’s time to consider replacing it. Here are some additional signs that your battery is nearing the end of its life:

  • The battery is old: Lead-acid batteries typically last 3-5 years.
  • The battery is physically damaged: Check for cracks, leaks, or corrosion on the battery casing.
  • The car’s electrical system is struggling: Noticeable slow cranking or dimming headlights are signs that the battery may be failing.

Expert Opinion:

A dead cell in a car battery is like a missing link in a chain, it weakens the entire system. It’s best to replace the battery if you have a dead cell, as the problem will likely only get worse over time,” says Mark Anderson, a certified automotive technician with over 20 years of experience.

While you can sometimes temporarily revive a battery with weak cells, it’s a band-aid solution that doesn’t address the underlying issue. You’re essentially prolonging the inevitable, and you could end up stranded again down the road,” adds Sarah Miller, a seasoned automotive mechanic and car enthusiast.

FAQs:

Q: How long can a car battery with dead cells last?

A: A car battery with dead cells can last for a short while, but its performance will be compromised. It may start the car, but it might not be able to provide enough power for everything else, like headlights or the radio.

Q: Can I replace just one dead cell in a car battery?

A: Replacing individual cells in a car battery is not recommended. It’s usually more cost-effective and reliable to replace the entire battery.

Q: Can I jump-start a car with a dead cell in the battery?

A: While jump-starting a car with a dead cell in the battery may work temporarily, it can put a strain on the other cells and worsen the problem.

Q: Can I use a battery charger to fix a dead cell in a car battery?

A: A battery charger can sometimes revive a battery with weak cells, but it won’t fix the underlying issue of a dead cell.

Q: How much does it cost to replace a car battery?

A: The cost of replacing a car battery varies depending on the type of battery and the make and model of your car. It’s best to consult with your local mechanic or an automotive parts store for an accurate estimate.

Need more help? Contact us at +1 (641) 206-8880 or visit our office at 500 N St Mary’s St, San Antonio, TX 78205, United States. We’re here to help you get back on the road.

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