Why Car Batteries Fail in Winter and How to Prevent It
Winter is no friend to your car battery. At Boise Towing Co, we receive more calls for dead batteries during the colder months
than at any other time of year. Nothing’s more frustrating than a car that won’t start when it’s freezing outside. But why are batteries more likely to fail in winter? More importantly, what can you do to prevent it? Let’s dive into the reasons behind this common issue and share practical steps to keep your car battery alive through Idaho’s chilly season.
Why Do Car Batteries Struggle in Winter?
When temperatures plummet, car batteries face unique challenges. Here’s why:
Cold Weather Reduces Battery Efficiency
Car batteries rely on chemical reactions to generate the power needed to start your car. When temperatures drop, these reactions slow down, significantly reducing the battery’s ability to perform. At freezing (32°F), a battery’s power decreases by about 20%, and at 0°F, it can lose up to 50%.
Engines Need More Power to Start in the Cold
Cold temperatures thicken your engine oil, making it harder for the engine to turn over. This increased resistance demands more power from your battery—at the very time when your battery is at its weakest.
Higher Power Demands in Winter
In winter, we rely more heavily on features like headlights, heaters, defrosters, and heated seats. This extra load can strain an already struggling battery, especially on shorter trips.
Aging Batteries Are Vulnerable
If your battery is nearing the end of its life (typically 3–5 years), the cold weather can tip it over the edge. Older batteries lose their ability to hold a charge effectively, making them more likely to fail during winter.
How to Spot a Failing Battery
Before your battery leaves you stranded, it often gives warning signs, such as:
Slow Engine Crank: Your engine takes longer to start, especially in the morning.
Dim Lights: Interior or exterior lights that seem dimmer than usual can signal a weak battery.
Warning Lights: A battery or check engine light on your dashboard could indicate trouble.
Corrosion or Swelling: Visible corrosion around battery terminals or a bloated battery case means it’s time for a replacement.
If you notice any of these issues, don’t wait for your car to fail—act now to avoid being stuck in the cold.
Steps to Keep Your Battery Healthy in Winter
While you can’t control the weather, you can take proactive steps to keep your battery in good shape during winter:
1. Test Your Battery Before Cold Weather Hits
Many auto shops and parts stores offer free battery testing. This quick check-up can reveal whether your battery is ready for winter or needs to be replaced.
2. Clean Battery Terminals
Corrosion on the battery terminals can block the flow of electricity. Check your terminals regularly and clean any buildup with a mixture of baking soda and water.
3. Keep the Battery Charged
If your car sits unused for long stretches during winter, its battery may not stay adequately charged. A battery maintainer (also called a trickle charger) can help keep it charged and ready to go.
4. Limit Short Drives
Short trips don’t give your alternator enough time to recharge the battery after starting the engine. Combine errands into fewer, longer trips to help your battery maintain a proper charge.
5. Park in a Garage or Use a Battery Heater
If you have access to a garage, park your car indoors to keep it out of the harsh cold. If outdoor parking is your only option, consider a battery blanket or heater to keep the battery warm and functional.
6. Replace Batteries Near the End of Their Lifespan
Don’t gamble with an old battery in winter. If your battery is over three years old, consider replacing it before it fails unexpectedly.
What to Do if Your Battery Dies
Sometimes, even the best preparation isn’t enough. If your battery dies, Boise Towing Co is here to help with 24/7 roadside assistance, including jump-start services. Here’s what to do if you find yourself with a dead battery:
Prioritize Safety: If you’re on a busy road, turn on your hazard lights and move to a safe location if possible.
Call for Assistance: Contact Boise Towing Co, and we’ll send help your way quickly.
Plan for a New Battery: A dead battery is often a sign that it’s time for a replacement, so make arrangements to get a new one as soon as possible.
Stay Ahead of Winter Battery Trouble
At Boise Towing Co, we understand how inconvenient and stressful a dead battery can be, especially in the winter months. By taking these preventative steps, you can minimize the risk of battery failure and keep your car running smoothly. And if the unexpected happens, remember that we’re just a phone call away.
Stay safe this winter, and let Boise Towing Co handle all your roadside emergencies with fast, reliable service!