Why Do Battery Terminals Melt?

When you notice that the terminals on your battery melt, this indicates some serious problems. Battery terminals that are shorted, overloaded, or left in a discharged state can cause battery terminal meltdown.

  • Shorting – A short circuit is when the positive and negative electrodes of an electrochemical system come into contact with each other through some conducting medium like water or sweat. When a battery is shorted, it essentially bypasses the load. This causes very high currents to flow through the system, which will result in overheating and melting of any components that get in its way.
  • Overloaded – The main reason batteries fail is because they are overloaded. Being overloaded can be caused by a variety of reasons, such as leaving headlights on after a battery has been shut off, leaving the radio on after the car is turned off, or overcharging of batteries. Overloading can cause melted terminals as well as explosions and rupture of cell casings if it gets severe enough.

How do you fix a burnt battery terminal?

Your battery terminals will melt if you let them get hot because they are made out of lead. Lead melts at 327 degrees Fahrenheit, which means when you’re car engine heats up, it can cause the terminals to burn and melt away, causing a short circuit in the electrical system. This causes issues with starting your vehicle’s motor, so it’s important to fix the problem right away.

You can replace your battery with one that is more maintained for high temperatures, although this may be costly.

A quick and free solution would be to remove any corrosion on the terminals, which you can do by using baking soda or a small file. This will ensure there are no gaps in the lead that can cause a short circuit.

You are also able to use insulating tape as an added layer of protection against corrosion and overheating battery terminals. If you do not have any baking soda or files, this is another option that will help maintain your car’s temperature and prevent from burning the batteries.

You can also try disconnecting your car’s electrical system until the temperature reduces.

If you do not have time to run all of these solutions, it is suggested that you disconnect your battery terminals until they cool off, so you don’t risk burning them completely and causing more issues with your vehicle.

It’s important to note that if there is a lot of corrosion or debris built up on your battery, you might need to clean this off before disconnecting the terminals.

You can also try adding distilled water to your car’s batteries if they’re getting too hot and causing melting as well as burning under the hood. This will reduce overheating issues which cause melting in high temperatures.

If you’ve tried all of these solutions and your terminal is still burning, it’s time to call a mechanic. There may be other issues with the battery or electrical system that need to be fixed by an expert.

Can a corroded battery terminal be fixed?

If your battery terminal melting and is in danger of catching on fire, it needs to be fixed before you can drive the car again. The corrosion may have eaten through wiring that could catch on fire at any time when driving or just sitting in the garage. There are many things that can cause a battery terminal to melt, such as: overcharging, undercharging, and leaving the lights on.

If the corrosion has not gone too far up into the cable, you can purchase a new battery terminal from your local auto parts store. If it’s a simple fix of just replacing one quick connector, you should be able to do this yourself in about 20 minutes or less, depending on how old your battery is.

Replacing the entire wire can be a bit more difficult if you are not comfortable working on cars or with electricity, but this job is still doable for someone who has some experience doing basic car repairs and maintenance. If you decide to replace the whole cable yourself, make sure it’s long enough to reach from the battery to the starter. A bad or too short connection can cause you problems even after repairing your melted terminal if it’s not properly routed and secured.

Battery terminals are supposed to be made of metal that conducts electricity but does not corrode easily; they should never melt under normal circumstances. If you notice this happening, something else in the can a corroded battery terminal be fixed.

Does battery terminal corrosion mean the battery is bad?

The battery might deserve a closer look if the terminals are corroded. A bad connection can cause problems with starting and charging, as well as heat on both ends of the cable. If your car starts more sluggishly than usual or has trouble maintaining its charge, it could be related to corrosion at either end of the positive jumper cables that connect the battery to the starter and alternator. The cable might be loose, corroded, or broken. Corroded terminals can also cause heat buildup inside your engine bay because it affects the electrical circuit.

This is not an easy problem to solve on older cars with big, clumsy cables ending in large clamps that are difficult to get off the terminals. The best solution is to replace the cables, but if they are too hard to remove or you don’t have new ones on hand, clean them with a wire brush and spray some type of rust-resistant coating onto both ends before reinstalling them.


A melted battery terminal can result in a ruined car, and it’s best to avoid that is by keeping your terminals clean. It only takes an extra minute or two of regular maintenance on your part to prevent disaster from striking due to bad wiring, so be sure you’re doing all you can do.

About the author, Phil Borges

Phil Borges is a battery aficionado. He's written extensively about batteries, and he loves nothing more than discussing the latest innovations in the industry. He has a deep understanding of how batteries work, and he's always on the lookout for new ways to improve their performance.