How to Fix a Leaking Car Battery?

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If your car heats up too early, doesn’t work smoothly, and gives unexpected pauses while driving, you must first look at the battery to identify the problem. 

The battery is the engine’s primary power source; any damage done to it will directly impact the vehicle’s performance.

With that said, a leaking car battery is a significant risk, and you should fix it first to avoid facing any severe consequences.

This detailed guide will let you go through each detail about why your car battery is leaking and how you can fix this by following the simple steps. 

But, before getting straight toward the solution, you must first know the causes behind it. Let’s take a look at it.

What Are The Causes Of The Leaking Car Battery?

After discovering your battery is leaking, you should address this problem as soon as possible.

Usually, car batteries leak because they get too old or have taken damage.

To identify what could be the root of this rising problem, we’ve explained some causes of leaking car batteries below:

1. An Overcharged Battery:

Excess to everything is terrible. The same rule applies to batteries.

If you repeatedly overcharged your battery, the electrolyte starts boiling, which causes leaking from the vent caps.

This also might be why your battery terminals catch corrosion and rust too fast.

In sporadic cases, the gases can build up inside the battery and cause it to explode.

But what causes the battery to overcharge in the vehicle?

The malfunctioning of the alternator in the car system might be the reason for getting your battery overcharged.

But it’s rare for the new batteries to fall victim to it because of modern technology.

Smart battery chargers can help lessen your pain by keeping you updated about battery power to avoid getting it overcharged.

2. Your Battery is Old:

The famous saying, “OLD IS GOLD,” may not stand correct regarding batteries.

They have a specific working life, but they don’t last forever.

For example, The average life of car batteries is about 3 to 5 years.

If your vehicle battery has covered its average life, it might be why it’s leaking.

You have to replace it with a new one to get better results.

3. Weather Problems

Extreme cold weather can freeze your battery liquid, disturbing its smooth functioning and causing the case to bulge.

This indefinite change can damage the seal and even crack the top or sides of the case. 

If you live in a frigid climate, this is a red sign.

You have to take extra care of the battery to save it from leaking. 

4. Overfilling The Battery

If you cross the limits, you have to face circumstances. The same applies to batteries.

If you add water to the battery over its limit, its electrolyte will expand and cause the battery to leak from the vent caps.

You must keep things moderate and add water as much as the battery demands.

Overfilling will do no favor but cause damage all the way.

5. Cracks In The Battery

It is obvious to have leakage in the car battery when cracks are present.

The reasons why batteries fall victim to cracks are extreme weather and excessive shaking that might be from driving over rough surfaces.

While functioning, the fluid in the battery makes its way out of the cracks that result in leaking.

It is recommended to take extra care while driving over rough terrain, especially if your car has terrible suspension.

By now, you must have got an idea about the reasons that cause your battery to leak.

Let’s look at a solution if you ever go through this problem.

How Do You Fix A Leaking Car Battery?

Fortunately, you can fix a leaking car battery by following the simple steps below. Here’s how you can do it.

What you need:

You have to gather some tools to make your task successful. Mentioned below are their names.

  • Plastic Bin 
  • Epsom Salt
  • Baking Soda
  • Sealant
  • Sandpaper

Step 1: Uncap the posts

The first step comes with uncapping the battery posts.

Once you’ve done this, now carefully transfer the battery electrolyte into the plastic bin.

Battery electrolytes are acidic, so take extra care while transferring them.

Step 2: Put Baking Soda

It would help to put the baking soda in the plastic bin to neutralize the sulphuric acid over battery electrolytes.

Step 3: Sand and Seal The Cracked Areas

Remove the water from the battery casing and sand the cracked areas using sandpaper until it becomes smooth to touch by hand.

Apply the sealant to the cracked areas and leave it to dry correctly.

Step 4: Make a Solution

You have to make a water solution with Epsom Salt in this step.

First, heat the three cups of water (150 F), dissolve the Epsom salt, and let it cool.

Step 5: Clean and Transfer the Electrolytes

You must pour the water and Epsom Salt on the electrolytes and wait for some time.

Once they are cleaned, fix them back on the battery.

Keep the battery surface dry because water can bring rust, corrosion, and rust to the battery.

Step 6: Replace The Caps

Replace the caps and fix them tightly on the battery.

Your battery leaking problem is now resolved, but you have to shake it for 5 minutes and charge it for 36 hours with a trickle charger to make it fully functional.


If not solved on time, car battery leaking can result in a great turnout for your vehicle performance.

And, to help you in that regard, we have thoroughly explained the causes and solutions to the car battery leaking problem.

We hope this article helps you by fixing your car battery leaking; if yes, also check out other exciting blogs.

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