Why Does My Positive Battery Terminal Keep Corroding (Answered)

Published on: September 23, 2022
Written by Ian Carter / Fact-checked by Baten Khalil

If you’ve noticed that your positive battery terminal keeps corroding, you’re probably wondering why this is happening. There are a few different reasons why this might be occurring, and understanding the cause can help you fix the problem.

why does my positive battery terminal keep corroding

If your positive battery terminal keeps corroding, it’s likely due to a buildup of sulphuric acid. This can happen if your battery is overcharged or is not being used often enough, and the acid forms a crust on the terminals. If this happens, it’s important to clean the terminals regularly to prevent the build-up from causing damage to your car’s electrical system.

Sometimes, it may be as simple as tightening the connection between the terminal and the battery post. Other times, cleaning or replacing the terminal may be necessary. Let’s take a closer look at each of these potential causes so you can get to the bottom of your corrosion issue.

Battery Corrosion Keeps Coming Back

If your car battery dies or won’t hold a charge, it could be due to corrosion. The acid causes corrosion in the battery and can eat away at the terminals and cables, causing them to break down. This can eventually lead to a dead battery.

There are a few things you can do to prevent corrosion from happening in the first place

Number oneMake sure you clean your battery terminals regularly with a baking soda and water.
Number twoYou can also try using battery terminal protectors or covers.
Number threeIf corrosion has already set in, you’ll need to clean it off before it does any more damage. Scrub the terminals with a wire brush and then rinse with water. Once they’re clean, apply a coat of petroleum jelly or dielectric grease to help prevent future corrosion.
Few things you can do to prevent corrosion from happening in the first place

Why Does My Negative Battery Terminal Keep Corroding?

If you’ve ever found a green or white powdery substance on your car’s battery terminals, it’s probably corrosion. Corrosion is caused by a chemical reaction between the metal of the terminal and the acid in the battery. The corrosion can build up and prevent electricity from flowing freely between the battery and the terminal, which can cause starting problems.

There are a few things that can cause corrosion on battery terminals, including:

Leak Battery

A leaky battery: If your battery is leaking acid, it will eventually run down the side of the battery and onto the terminal. This can happen if your battery is old or damaged.


Moisture: If there’s moisture present on the terminal (from rain, snow, etc.), it can cause corrosion to form. – Loose connections: If your terminals aren’t tight against the battery posts, they can move around and allow moisture or other contaminants to get under them and cause corrosion.So don’t start a car when the battery is wet.

Blue Corrosion on Positive Battery Terminal

If you’ve ever noticed blue corrosion on the positive battery terminal of your car, you’re not alone. This corrosion type is quite common, and it’s usually nothing to worry about. The blue color is caused by copper oxide, which forms when the copper reacts with oxygen.

This reaction is accelerated by moisture, so corrosion is more likely to occur in humid or wet conditions. While the corrosion itself is not harmful, it can be an indication that there is something wrong with your battery. If the terminals are covered in a thick layer of corrosion, it can prevent electrical current from flowing freely between the battery and your car.

Can Blue Corrosion Create Problems?

This can lead to starting problems or other issues. If you notice any corrosion on your battery terminals, it’s best to clean it off as soon as possible. You can use a wire brush or some other type of cleaner specifically designed for removing battery corrosion.

Once the terminals are clean, apply a thin layer of grease or Vaseline to help prevent future corrosion.

Corrosion on Battery Terminal And Car Won’t Start

If you’ve ever had a car that wouldn’t start, only to find out that the battery terminals were corroded, you know how frustrating it can be. Corrosion on battery terminals is one of the most common reasons a car won’t start, and it’s something that’s easy to fix.

Follow the step-by-step guideline:

First stepThe first thing you need to do is clean the corrosion off of the terminals. You can do this with a wire brush or by using a solution of baking soda and water.
Second stepOnce the terminals are clean, you’ll need to apply a thin layer of grease to them to prevent future corrosion.
Final stepIf your car still doesn’t start after cleaning the terminals, there may be another issue at play. It’s always best to consult with a mechanic or auto body shop if you’re having trouble starting your car. They can help diagnose the problem and get your car back on the road in no time!
Step-by-step guidelines to fix corrosion on the battery terminal

How to Stop Battery Terminal Corrosion?

how to stop battery terminal corrosion

If your car battery terminals are corroded, it can lead to many problems. The most obvious problem is that the battery won’t be able to start your car. But even if the corrosion isn’t bad enough to prevent starting, it can still cause issues.

Corrosion can lead to electrical problems that can cause engine and starting issues. The best way to stop battery terminal corrosion is to prevent it from happening in the first place. Follow this guideline to prevent damage:

Keep the Battery Clean And Dry

That means keeping your battery clean and dry. If you live in an area with a lot of salt on the roads (like we do here in Minnesota), you might want to consider getting a special Battery Terminal Protector Spray. This will help keep salt and other corrosive materials off of your battery terminals.

Use Cleaning Products

If your terminals are already corroded, you’ll need to clean them up before they cause any further damage. You can use a simple household cleaner like vinegar or baking soda, or you can buy a commercial battery terminal cleaning kit at your local auto parts store.

Just be sure to follow the instructions carefully, so you don’t damage your battery or terminals any further.

Can Corroded Terminals Drain Battery?

As your vehicle’s battery ages, the terminals can become corroded. This is often caused by exposure to the elements or old age. Corroded terminals can cause several problems, including reducing your battery life and causing it to drain more quickly.

In extreme cases, corrosion can even lead to a short circuit, which can be dangerous. If you notice that your battery terminals are looking corroded, it’s important to clean them as soon as possible. You can do this with a simple cleaning solution and some elbow grease.

Once you’ve cleaned off the corrosion, protect the terminals with a terminal protector or similar product. This will help prevent future corrosion and keep your battery working properly for longer.

Does a Corroded Battery Need to Be Replaced?

A corroded battery is a battery that has been damaged by corrosion. This can happen when the battery is exposed to moisture or other corrosive materials. When a battery becomes corroded, it can no longer provide the power to run your car or other devices.

If you have a corroded battery, you will need to replace it as soon as possible. A new battery will cost you around $100, but keeping your car running smoothly is worth the investment.

Corroded Battery Terminal Symptoms

If your car battery terminals are corroded, you may notice one or more of the following symptoms:

  1. The engine is slow to start.
  2. The headlights are dim.
  3. The interior lights are dim.
  4. The power windows are slow to operate
  5. The power locks are slow to operate.
  6. The stereo system sounds weak or muted.

What Causes Excessive Corrosion on Positive Battery Terminal?

When battery corrosion builds up on the positive battery terminal, it creates a barrier between the terminal and the cable connector. This can prevent electrical current from flowing freely between them, causing excessive voltage drop and increased resistance. The most common cause is sulfation, which occurs when sulfuric acid in the electrolyte breaks down into lead sulfate crystals on the lead plates inside the battery.

Over time, these crystals build up and form a thick layer that insulates the lead from the electrolyte, preventing electrons from flowing freely through it.

What Size Bolt Should I Use to Prevent Corroding on My Positive Battery Terminal?

To prevent corroding on your positive battery terminal, it is essential to choose the right battery terminal bolt size. By selecting a bolt that fits properly, you ensure a tight and secure connection, reducing the chances of corrosion. Be sure to consult your vehicle’s manual or a professional to determine the correct battery terminal bolt size for optimum performance and longevity.

How Do I Keep My Battery Terminals from Corroding Positive?

Most car batteries are lead-acid batteries, and the terminals that connect the battery to the rest of the electrical system can be subject to corrosion if not properly cared for.

There are a few simple steps you can take to prevent or slow down corrosion on your battery terminals:

First step
First, ensure the terminals are clean and free of dirt or debris. A build-up of grime can accelerate corrosion.
Second stepSecond, apply a thin layer of petroleum jelly or dielectric grease to the terminal posts. This will create a barrier between the metal and oxygen, which is one of the main culprits in causing corrosion.
Third stepThird, if you live in an area with high humidity, consider using a battery terminal protector spray or gel, which will further help to prevent corrosion.
Final stepIf your battery terminals are already corroded, you’ll need to clean them before applying for any protection. Use a wire brush or sandpaper to remove as much corrosion as possible, then rinse with water and dry completely before proceeding with one of the methods above.
Few simple steps you can take to prevent or slow down corrosion on your battery terminals:

Why Do My Batteries Keep Corroding?

Batteries are devices that store and release electrical energy, and they are found in everything from cars to flashlights. Batteries contain two or more electrochemical cells that convert stored chemical energy into electrical energy. These cells are connected together in a series circuit, which means that the voltage of the battery is equal to the sum of the voltages of the individual cells.

The most common type of battery is the lead-acid battery, which contains lead and sulfuric acid. Lead-acid batteries are often used in cars because they provide a large amount of current for starting the engine. However, lead-acid batteries have several disadvantages, one of which is that they tend to corrode over time.

Corrosion occurs when the lead in the battery reacts with sulfuric acid, forming lead sulfate. This reaction produces electrons, which flow through the circuit and cause corrosion of metal parts. The rate at which corrosion occurs depends on several factors, including temperature, humidity, and air pollution.

Lead-acid batteries should be kept clean and dry to prevent corrosion. If a battery does become corroded, it can be cleaned with a solution of water and baking soda.

Does Corrosion Mean Bad Battery?

Corrosion on the battery terminals is a sure sign of a bad battery. If you see any corrosion, it’s time to get a new one.A bad battery can cause bad gas mileage.


The positive battery terminal is the part of the battery that is connected to the positive end of the battery cable. The positive terminal is usually marked with a + sign. Over time, the positive terminal can become corroded, which can cause problems with the electrical system in your car.

Corrosion can also prevent the battery from holding a charge. There are several things that you can do to clean the corrosion off of the positive terminal and prevent it from happening again.

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