Where Does Your Battery Vent Tube Go?

The battery vent tube is also called the breather tube. This tube is attached to the top of your gas tank and carries fumes from your engine compartment out through an exhaust pipe. But where does the battery vent tube go?

Is battery vent tube necessary?

Batteries are the lifeblood of your vehicle. They provide power to start the engine, keep lights on when you’re driving at night, and allow you to tune into your favorite radio station while driving down the highway.

Where does this precious liquid go? The battery vent tube is designed to release gases from inside of a car‘s battery so that it can continue working at peak performance levels without any risk of explosion or internal damage. If this system fails, then gas vapors will build up in an enclosed space and cause a dangerous situation for both drivers and passengers. It is important that all drivers know how their batteries work in order to avoid danger.

It is necessary to direct gases out of the battery box. These gases can be hydrogen or oxygen and are highly flammable when mixed together in the right ratio. If you don’t have a vent tube, then your batteries will explode inside their boxes which isn’t great for anyone on board.

It is recommended to use either a battery vent tube or an air pump to direct the gases out of the battery box.

Vent Tube: A rubber or plastic tube that attaches to the top of your batteries and goes out through the roof of the vehicle. It is often used with sealed batteries because it allows gases created by electrolysis to escape without building up inside the box. If you choose not to use vent tubes, then keep your battery vents open at all times as gas will otherwise build up and cause explosions.

Air Pump System: Air pump systems come in two different versions; one version has an air pipe running between each cell of every battery (multiple connections), while the other has one air pipe which is connected to all batteries (one connection). This system keeps gases constantly moving, so they never become a problem. It is important to make sure that the air pump system you use is compatible with your battery box and works appropriately so as not to cause damage.

Both vent tubes and air pumps work well in keeping batteries safe. If you’re unsure which one you need for your car, then check with a professional to get the best recommendation for your vehicle type.

What is the purpose of a battery vent tube?

The battery vent tube purpose is to release any gases that may build up as the battery ages and as it’s discharged more and recharged less. If any of those gases catch fire, they can create an explosion or even damage your vehicle. A good solution for this problem is simply to check the vents periodically and make sure you don’t see anything coming out, like smoke or flames. And if you do, it might be time to replace your battery.

How often should I check my battery vent tube?

You should check your battery vent tube periodically to make sure it’s clear of debris and that there’s nothing coming out like smoke or flames. If you do see anything, it might be time to replace the battery.

A car’s engine compartment has many items in it, including the radiator and various hoses. One hose which you should definitely know about is the one that goes from your positive (+) terminal to your air filter box or cabin area. This small rubber tubing allows gases such as hydrogen gas, produced when charging a lead-acid battery with an alternator, to escape into the atmosphere instead of building up under pressure inside your vehicle’s engine bay.

If your battery vent tube is failing, you might notice these warning signs:

– Your car has trouble starting up. This could be because the hydrogen gas is being forced into your vehicle’s cabin instead of escaping to the atmosphere as it should, which prevents you from getting enough oxygen in order to start your engine properly.

– You hear a hissing sound coming from under the hood. This is the sound of hydrogen gas being forced through your battery vent tube, which means it’s not working properly anymore.

– Your car smells like rotten eggs when you start it up or drive around for a few minutes with everything turned off and then turn on some accessories such as the air conditioner or heater to see if they work. This is because the hydrogen gas doesn’t have anywhere to escape, so it gets forced into your vehicle’s cabin instead.

– Your windows fog up on the inside when you turn on some accessories or even just start driving down the road for a few minutes.

If your battery vent tube not connected or your battery is not grounded properly, those can cause your battery to overheat. Overheating batteries is the number one cause of battery fires.

What happens if you don’t vent a battery?

If you do not vent a battery correctly, then it can explode and damage the surrounding areas. Venting is important because batteries release toxic fumes and hydrogen, which is a highly flammable gas. When these gases come into contact with air, they can ignite into flames if the right conditions are present. The pressure inside a battery also increases as you use it because the oxygen used up has nowhere to go except for back through your vehicle’s electrical system, so venting helps release the excess gas.

Where is the vent tube?

In order for a car to start up when its battery is fully drained, it needs a push from the outside air. In order to let in that air, automakers add an exhaust vent tube to their vehicles for this purpose. This tube goes from your car’s inside intake system and out through one of these places:

1) At one end of your vehicle or

2) Near the front or back bumper

3) Underneath your vehicle, next to a rear wheel well. Other body parts can also have a hosepipe sticking out if you want some fresh air in there too.


Keeping up with maintenance is easy when there are so many great products to help. Investing in tools like this battery vent tube will save you money and time down the road by helping your car run smoothly for longer periods of time without more expensive repairs needed.

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.