Does Heater Drain Car Battery? (Use Battery Heater Shield)

Published on: September 11, 2022
Written by Chris Dominic / Fact-checked by Nova Scarlett

If you’re like most people, you’ve probably wondered if a heater can drain your car battery. The answer is yes, it can. Here’s how it works: when you turn on the heater, the engine has to work harder to generate heat, which uses more fuel and puts more strain on the battery.

In addition, the heater fan draws power from the battery, which can also contribute to a drained battery. If your battery is already low on power, turning on the heater can cause it to drain completely and leave you stranded.

In some cases, simply replacing a faulty part can fix the problem and prevent further battery drain. In today’s article, we have shared everything you need to know about heater-draining car batteries.

does heater drain car battery

How Long Does a Car Battery Last With the Heater On?

When it’s cold outside, the heater is one of the most important parts of your car. But running the heater can put a strain on your car battery. So how long does a car battery last with the heater on?

The answer depends on a few factors, including your battery type, how old it is, and how cold it is outside.

Different factorsHow long will it last
A new battery in good condition Should be able to run the heater for about an hour before it needs to be recharged.
An older batteryMaybe only last for 10 to 15 minutes
And if it’s very cold outside (-20 degrees or belowEven a new battery may only last for 30 minutes or so.
How Long Does a Car Battery Last With the Heater On


If you’re regularly using your heater in cold weather, it’s a good idea to get your battery tested to ensure it’s still in good shape. And if you’re going to be using your heater for extended periods of time (like on a long road trip), bring along a portable charger just in case your battery starts to run low. You can use a UPS at your home to charge the car if you have a faulty charger.

What Can Drain a Car Battery When the Car is Off?

There are a few things that can drain a car battery when the car is off, and if you’re not careful, it can happen without you even realizing it. For example, if you leave your car running, this can drain your battery.

Leaving Your Headlights on Overnight

The most common culprit is leaving your headlights on overnight. Even if they’re just running lights or fog lights, they can still draw enough power to drain your battery.

If You Have a GPS System or Alarm System

If you have aftermarket electronics like a GPS system or an alarm system, those can also slowly drain your battery while the car is off.

If Your Battery is Old

And finally, if your battery is getting old, it may not hold a charge as well as it used to and could die overnight.

If you find that your car won’t start in the morning and the battery is dead, try these tips to get it going again.

Step one First, check all your lights to ensure they’re turned off.
Step twoIf they are, then check for any aftermarket electronics that might be drawing power from the battery.
Step threeIf everything looks fine there, then it’s likely that your battery is just old and needs to be replaced.
Step-by-step guidelines on how to fix a dead battery car

Does Heat Drain Car Battery Faster?

The temperature outside is very hot and can cause your car battery to drain faster than usual. The heat causes the chemicals inside the battery to break down and produce less electricity. If you’re going to be driving in hot weather, it’s a good idea to check your car’s battery before setting it out.

You may need to give it a boost with a jumper cable if it’s low on power. If you notice that your battery drains faster than normal during hot weather, try not to use any unnecessary electrical accessories in your car. Remember that jump-starting your car will also drain your battery. This will help prolong its life.

Does Heater Use Gas in Car?

If your car has a heater, it most likely uses gas to operate. The vast majority of cars on the road today have gasoline engines, so it only makes sense that their heaters would use gas as well. There are a few exceptions to this rule. For example:

Hybrid Cars

Some hybrid and electric cars do not use gas, so their heaters may run off battery power or another energy source. Nevertheless, if you have a traditional car with a gas engine, chances are good that its heater runs on gas.

So How Does This Work?

Well, when you turn on your car’s heater, it starts by drawing in cold air from outside the vehicle. This air is then routed through a series of metal coils that are heated by the engine’s exhaust gases. As the exhaust gases flow over the coils, they transfer their heat to them, warming up the coils (and the air passing through them).

Once the air is warmed up, it is blown into your car’s cabin for you to enjoy. Of course, all of this takes fuel – specifically gasoline – so running your car’s heater will cause your fuel economy to suffer somewhat. However, most people find the trade-off worth it when they’re stuck in a cold car during winter!

Does Heat Make Car Batteries Die Faster?

Summertime is here, and that means hot weather! You might not think that the temperature outside has much of an effect on your car battery, but it actually can. Batteries are made up of a series of cells filled with an electrolyte solution.

But How Does It Happen?

This solution is made up of water and sulfuric acid. When the battery gets hot, the water in the solution evaporates faster; as the water level drops, the sulfuric acid concentration increases, which can damage the cells in the battery. Additionally, high temperatures can cause the battery to leak or even explode.

If you live in a hot climate or are driving in hot weather, it’s important to check your car battery regularly to ensure it has enough water. Follow these steps regularly to check your battery.

  • You can do this by removing the plastic cover from the top of the battery (be careful not to touch any exposed metal) and using a turkey baster or similar tool to suck out any excess acid and add distilled water as needed.
  • it’s also a good idea to have your mechanic check your battery before summer starts to ensure it’s in good condition and can withstand higher temperatures.

Does Car Heater Work With Engine off?

In the dead of winter, the last thing you want is for your car heater to stop working. But what do you do when it does? Is it safe to run the engine with the heater on while the car is off?

Here’s what you need to know about using your car heater with the engine off.

It is Safe to Use

It is perfectly safe to run your car heater with the engine off as long as you’re not doing it for an extended period of time. The battery will eventually drain if you’re running the heater and all other accessories without the engine on.

Do Not Overheat the Engine

If your car has a manual transmission, it’s best to start the engine and let it idle for a few minutes before turning on the heat. This gives the transmission fluid a chance to warm up and circulate properly.

As long as you’re not overworking your battery or causing any other safety concerns, there’s no reason why you can’t enjoy a warm car this winter!

Does Heat Drain AA Batteries?

Heat is one of the main factors that can affect the performance and lifespan of a AA battery. When batteries are exposed to high temperatures, they will start to degrade, and their capacity will decrease. This can lead to shorter battery life and reduced performance.

exposure to extreme heat can also cause batteries to leak, swell, or even explode. There are a few things you can do to help extend the life of your AA batteries in hot weather:

1. Store them in a cool, dry place out of direct sunlight

2. Remove them from devices when not in use and avoid leaving them turned on for extended periods of time –

3. Don’t recharge them until they are completely dead – overcharging can also decrease battery life if you’re using AA batteries in an environment where they are likely to be exposed to high temperatures.

4. It’s important to keep an eye on their performance and replace them more frequently than you would in cooler conditions.

Car Battery Heat Shield

We all start using our air conditioners more frequently as the weather gets warmer. However, did you know that your car’s battery can also be affected by heat? Just like us, batteries don’t function as well when it’s hot outside.

Why is It Important to Use Car Battery Heater Shield?

Excessive heat is one of the leading causes of battery failure. That’s why it’s important to have a car battery heat shield installed if you live in a warm climate. Let’s look at the overall on why you need to use a car battery heater.

Number of reasonDescription
Number oneA heat shield helps protect your battery from extreme temperatures and extends its lifespan.
Number twoit’s a relatively inexpensive investment that could save you money and hassle down the road.
Number threeIf you’re not sure if your car has a heat shield or not, just take a look under the hood. If there’s a metal or plastic cover over the top of the battery, then chances are good that there’s already a heat shield in place.
Number fourIf not, you can easily find them online or at your local auto parts store. So don’t wait until your battery fails – get ahead of the game and install a car battery heat shield today!
The reason why it is important to use a car battery heater shield

How to Keep Car Battery from Dying When Not in Use

It’s a common problem- you go to use your car after it’s been sitting for a while, and the battery is dead. Why does this happen? And how can you prevent it?

The main reason batteries die when not in use is because of something called self-discharge. This is when the chemicals inside the battery start to break down and release energy, even when the battery isn’t being used. Over time, this process will completely drain the battery.

There are a few things you can do to prevent self-discharge from happening:

1) Keep Your Battery Charged

The best way to keep a battery from dying is to make sure it stays topped up with power. If you know you will be storing your car for an extended period, hook up a trickle charger or solar charger so that the battery doesn’t have a chance to run dry.

2) Disconnect the Negative Terminal

Another way to prevent self-discharge is by disconnecting the negative terminal of your battery. This will stop any current from flowing through the battery, and as long as you reconnect it before trying to use your car again, there shouldn’t be any issues. Just be sure you know where the negative terminal is before doing this!

3) Store in a Cool, Dry Place

Heat speeds up chemical reactions, so if you store your car in a hot garage or shed, it’s more likely that self-discharge will occur. Try to keep your vehicle in a cooler environment if possible, such as an air-conditioned space or even just in shade during the summer months.


If your car heater isn’t working properly, it could drain your battery. A faulty heating system can cause your battery to lose power and eventually die. If you notice that your car’s battery is dying more quickly than usual, it’s worth taking it to a mechanic to have the heater checked out.

Give it a break every so often to allow the battery to recharge. Finally, if your battery does die, jump-start it as soon as possible to avoid damaging the battery further.

Frequently Asked Question

Does Heat Drain Battery Life?

Yes, heat can drain battery life. When a battery gets hot, the electrical current’s chemical reaction slows down. This means that the battery won’t be able to produce as much power, and it will need to be recharged more frequently.

Heat can also damage the internal components of a battery, making it less effective over time.

Does Car Heater Use Coolant?

Most car heaters use coolant to function. The coolant helps to distribute heat evenly throughout the heater core, providing consistent warmth to the passengers in the car. There are a few different types of coolant available on the market, so it’s important to consult with your mechanic or dealership to find the best option for your vehicle.

In some cases, distilled water can be used in place of coolant, but this should only be done under the guidance of a professional.

What Temperature Kills a Car Battery?

A car battery typically dies when the temperature outside is very cold. This is because the battery’s chemical reaction slows down at low temperatures, which means it can’t produce the electrical current needed to start your car. If you think your battery may be dead, try starting your car with a jumper cable connected to another vehicle.

If that doesn’t work, then it’s time for a new battery.

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