How to Keep Your Car Battery From Dying in the Winter

3 minutes can save you hundreds. Enter your postal code below and join thousands of Canadians saving on car insurance.

Secure. No Spam. No Fees.

Why You Can Trust MyChoice

MyChoice serves as an independent intermediary between you, financial institutions and licensed professionals without any additional charge to our users. In the interest of transparency, we disclose that we partner with some of the providers we write about – we also list many financial services without any financial gain. MyChoice does not operate a financial institution or brokerage and to ensure accuracy, our content is reviewed by licensed professionals. Our unique position means that we hold no recurring stake in your policy, ensuring our mission to help Canadians make better financial decisions is free of bias or discrimination. 

Article Contents
By Aren Mirzaian
Last updated on March 07, 2026

6 minute read

MyChoice follows a strict content review process designed to ensure reliable and unbiased information.

Article Contentstable-of-contents

How to Keep Your Car Battery Alive in Winter at a Glance

  • Batteries tend to fail in winter because cold weather slows chemical reactions inside the battery and thickens engine oil, forcing the battery to work harder.
  • Drive your car regularly and take longer trips. Driving at least 10 km a few times a week allows the alternator to fully recharge the battery.
  • Limit the use of power-hungry accessories when possible. Features like seat warmers, defrosters, and fog lights can drain the battery quickly in cold weather.
  • Park your car in a garage or sheltered area when possible. Keeping your vehicle warmer helps reduce stress on the battery during cold nights.
  • Check battery terminals for corrosion regularly. Cleaning buildup can improve electrical connections and help the battery perform better.
How to Keep Your Car Battery Alive in Cold Weather

How to Prevent Your Car Battery From Dying in Cold Weather

Cold weather is just another part of life in Canada. Thankfully, there are things you can do to protect your car battery from it and potentially save money by extending the life of your battery and avoiding unexpected replacements.

Here are six tips for prolonging your battery’s life over winter:

Tip #1: Take Longer Trips

Winter driving is tough, so most people try to stay off the roads as much as they can. But cutting back on your driving time, whether unintentionally or not, can be bad for your car’s health.

Driving your car regularly – and taking longer trips – allows your alternator to recharge your battery, giving it enough power to restart even when the temperature drops significantly. Consider taking a road trip every now and then to keep your battery healthy. Just make sure to follow these highway driving tips and use winter tires to make driving on slippery roads safer.

Some people believe that letting their cars idle for several minutes will do the trick, but this can actually backfire on you. Idling or taking short trips can potentially shorten your battery’s lifespan instead of prolonging it, as the battery doesn’t get enough time to recharge fully.

A good rule of thumb is to drive your car about 10 km or more a few times each week so the alternator has time to recharge the battery.

Tip #2: Avoid Using Too Many Accessories at Once

Features like seat warmers, windshield wipers, radio, and fog lights all rely on your battery to work. When you have them all on at once, you can potentially keep your battery from charging to its full potential – or at all.

If possible, try not to use all your accessories at once to prevent overloading your battery. If, for example, you need your wipers, headlights, and defrosters on, maybe you can turn the radio off for a while.

Tip #3: Disconnect Your Battery or Use a Battery Blanket

Some people prefer to drive a beater car during winter to protect their main car from all the harsh elements the season brings. If you’re planning on doing this and storing your main car in a garage for several weeks, make sure to disconnect the battery and keep it in an area with more heat.

On the other hand, if you plan on using your car throughout the winter, you can keep your battery warm with a battery blanket or warmer. This is a heating pad that typically plugs into an outlet and keeps your battery at a consistent temperature.

Tip #4: Don’t Leave Your Car Outside

If you have a garage or access to underground parking, don’t pass up the chance to keep your car (and battery) safe and warm.

If you absolutely must park outside, make sure not to park on top of bare earth – this can expose your car to moisture and particles that could lead to corrosion.

Tip #5: Check Your Battery Terminals for Corrosion Regularly

Even if you do park your car indoors, corrosion can still happen. A damaged battery can cause acid to leak and corrode the surrounding areas. Too much buildup can create more resistance between connections, making it harder than it already is for the battery to start your engine. This is why it’s important to check your car battery terminals regularly.

Tip #6: Get Yourself a Battery Charger

A battery charger gets enough electricity into your car’s battery even if it’s been sitting in your garage for months. There are two types of car battery chargers: trickle and tender.

  • Trickle chargers provide a slow, continuous stream of electricity to your battery. These usually plug into an electrical outlet in your home.
  • Tender chargers, also called maintainers, only charge your battery when it’s running low. These “smart” chargers also tell you when the battery is fully charged. For this reason, tender chargers are better at preventing overcharging. However, they tend to be more expensive than trickle chargers.

How Long Do Car Batteries Typically Last?

Most car batteries last about 3–4 years, depending on driving conditions and maintenance.

All car batteries degrade over time, and some factors can shorten a car battery’s lifespan even further. This includes:

  • The battery’s size
  • Prolonged exposure to abnormally hot and cold weather
  • Taking frequent short trips
  • Exposure to moisture, corrosion
  • Leaving the electrical accessories on when parked
  • Frequent driving in heavy traffic

The Effects of Cold Weather on Batteries

Extreme temperatures can affect the longevity of car batteries. These are the reasons why car batteries tend to die out all of a sudden in the winter:

Cold temperatures slow the chemical reactions inside a battery, reducing its ability to deliver the power needed to start the engine. This is because batteries operate through an electrochemical reaction that speeds up in higher temperatures and slows down in lower ones.

At around 0°C, a car battery can lose up to about 60% of its starting power, while the engine may require more energy to start in cold conditions.

Cold temperatures can reduce battery efficiency and slow the electrochemical reactions involved in charging and discharging. Driving further in one trip helps charge your battery and ensures a better chance of restarting. But, in the winter, drivers are often less inclined (or able) to take their cars out due to dangerous conditions, which could slow the battery’s recharge rate.

Another reason why batteries tend to fail during winter is that engine oil gets thicker when exposed to cold temperatures. When your engine oil becomes too viscous to flow smoothly, the battery has to work in overdrive to get the engine going.

Drivers tend to use more accessories in the winter, like windshield wipers, seat heaters, defrosters, and headlights. These all use up your car’s battery and reduce its capacity to recharge as you drive. Plus, even starting the engine requires more power in the cold.

Bear in mind that, although it may seem like car batteries are more prone to breakdowns in the winter, it is actually high temperatures that can do the most damage.

Extreme heat can cause batteries to shut down, as it speeds up the corrosion of the battery’s internal plates and causes electrolytes to vaporize more quickly. As winter comes after summer, all the stress put on a battery in the previous months can finally catch up to it once it’s exposed to cold temperatures.

When Is It Time to Replace Your Car Battery?

Knowing when it’s time to replace your car battery can be tricky. Take away some of the guesswork by checking for the following signs regularly:

Your Car Takes Longer Than Usual to Start

If your car takes a few seconds to start, it’s likely taking longer to receive a charge from the alternator. If it makes a clicking sound, that means it’s already long gone.

If your engine starts but dies moments later, that could also be a sign that your battery is starting to go.

Your Check Engine Light Goes On

Your check engine light is your engine computer’s way of warning you that something isn’t right. The most common problems that trigger your car’s onboard computer include:

  • Oxygen sensor failure
  • Spark plug or ignition coil problems
  • A loose fuel cap
  • A catalytic converter failure
  • A vacuum leak
  • Exhaust gas recirculation valve failure

The check engine light can also be indicative of a dead battery. Problems under the hood are often caused by an undercharged battery or a misconnected electrical unit – this can result in low voltage at the car’s central computer, triggering the check engine light.

Your Headlights Have Gotten Dimmer

Driving at night in the winter is already dangerous as it is. But when your headlights go dim, it may spell even more trouble for you — especially if you’re far from home.

Your headlights getting dimmer may be a sign that your battery is about to go. A failing battery can’t bring enough power to your vehicle’s electrical components, including your lights. Watch out for dimming or flickering interior lights as well, especially when you’re starting your car or allowing it to idle.

Key Advice from MyChoice

  • Prepare your car before winter arrives. If your battery is already a few years old, testing or replacing it before the coldest months can help prevent unexpected breakdowns.
  • Keep emergency equipment in your vehicle. Booster cables or a portable jump starter can help you quickly deal with a dead battery in freezing conditions.
  • Consider roadside assistance coverage. Many auto insurance policies or add-ons include battery boost services, which can be helpful if your car won’t start in winter.
  • Be prepared for winter roadside emergencies. A dead battery can leave you stranded in cold conditions, so consider keeping booster cables or roadside assistance coverage as part of your auto insurance protection.

Congratulations! You made it to the end!

Now, here is the easy part: complete your quote in under 2 minutes
  • Secure. No Spam. No Fees.

Discover More About

How Much Will Chinese EVs Cost to Insure in Canada?
February 27, 2026
Chinese EVs are coming to Canada. Here’s how much BYD, MG and other models could cost to insure, with provincial breakdowns and projections.
Read full article
The Rising Cost of Car Repairs in Canada: Market Analysis
February 10, 2026
Car repair costs rose 4.1% in Canada in 2025. View our breakdown of provincial repair trends, labour shortages, and what they mean for auto insurance rates.
Read full article
Are Electric Vehicles Actually More Expensive to Insure?
January 26, 2026
In this MyChoice study, we analyzed data collected on our platform to compare insurance costs of popular electric cars with similar gas vehicles.
Read full article

Even More Ways To Save on Insurance