5 Things That Drain Your Car Battery Faster in Cold Weather

Cold mornings can quickly turn into a nightmare when you try to start your car and the engine just won’t turn over. In freezing temperatures, your battery has to work much harder to deliver the power needed to start the engine (often with less capacity than usual), often leaving drivers stranded at the worst possible time.

The cold does more than make you shiver, putting serious strain on your car's electrical system. Kazimieras Urbonas, Supplier Excellence Manager at Ovoko, one of Europe's largest online marketplaces for used car parts, sees the impact firsthand through increased demand for replacement batteries during colder periods.

“Whenever temperatures drop significantly, we notice a spike in battery-related enquiries,” says Urbonas. “Drivers often don't realize how much cold weather affects their car's power system until they're stuck with a dead battery.”

With over 23 million parts available across Europe, Ovoko connects thousands of auto dismantlers and recyclers with drivers who need reliable replacements. Here, Urbonas shares his expertise on the five biggest battery drains during cold weather and practical ways to avoid getting caught out.

5 Things That Drain Your Battery Faster in Cold Weather

1. Cold Temperatures Slow Down Battery Chemistry

Your car battery’s biggest enemy is temperature. At 0°C, a battery's power output drops by up to 20%, and things get much worse as it gets colder. At -17°C, your battery can lose a staggering 40-50% of its strength.

“Think of your battery like a person trying to run through treacle,” explains Urbonas. “The chemical reactions that create electricity literally slow down when it's cold. Your battery is working twice as hard to deliver the same amount of power.”

This means your engine needs more effort to turn over, while your battery has less power to give. It's a perfect storm for a flat battery.

2. Heating Systems Working Overtime

Your car's heater, demister, and heated seats might keep you comfortable, but they're absolute power-hungry monsters. Each system draws significant electricity from your battery, especially when the engine isn't running, or during short trips.

“Heated seats can draw 3-5 amps each, while your heater blower on full blast uses another 10-15 amps,” says Urbonas. “Add in your demister and rear window heater, and you're looking at a serious drain on your battery's reserves.”

Also read: 6 Things To Buy For Your Car Before Cold Season Hits

The problem gets worse because you're more likely to use all these systems at once when it's cold, creating a perfect storm of power consumption.

3. Short Journeys Don't Give Your Battery Time to Recover

Your alternator needs time to recharge your battery after starting the engine. Short trips to the shops or school run don't give it enough time to top up what was used during startup.

“Starting your engine can use 100-200 amps in just a few seconds,” explains Urbonas. “Your alternator needs at least 20-30 minutes of driving to replace that power fully. If you're only driving for 10 minutes, you're slowly draining your battery with each trip.”

This creates a downward spiral where each short journey leaves your battery a little weaker than before.

4. Electronics Left Plugged In

Dashcams, phone chargers, sat navs, and other gadgets might seem harmless when plugged in, but they create what's called “parasitic drain”. Even when your car is off, these devices can slowly sip power from your battery.

“A dashcam might only draw 0.1 amps, but over a week of being parked, that adds up,” says Urbonas. “In cold weather, when your battery is already struggling, even small drains can push it over the edge.”

5. Old or Weak Batteries Struggle More

If your battery is already past its prime, cold weather will expose its weaknesses fast. Most car batteries last around 3–5 years, but freezing temperatures speed up the decline by slowing chemical reactions and increasing internal resistance.

“An older battery simply can’t deliver the same power as a fresh one,” explains Urbonas. “If your battery has already lost some of its capacity, cold weather will make that loss far more noticeable. That’s when you start to see symptoms like slower cranking or dimmer headlights, which are clear signs it’s time for a replacement.”

How to Prevent Cold Weather Battery Drain

Urbonas lists several tips to help your car’s battery avoid the negative effects of the colder weather:

• Keep Your Battery Warm: Park in a garage when possible, or consider a battery blanket for extremely cold conditions. Even a few degrees warmer can make a big difference to battery performance.
• Limit Electrical Use on Short Trips: “Try to avoid using heated seats, full-blast heaters, and other heavy electrical loads during short journeys,” advises Urbonas. “Save the luxury features for longer drives when your alternator has time to keep up.”
• Unplug Accessories: Remove phone chargers, dashcams, and other accessories when you park. These small drains add up over time.
• Take Longer Drives Regularly: Make sure you take your car on longer journeys regularly. At least 30 minutes of driving at highway speeds gives your alternator time to properly recharge the battery.
• Get Your Battery Tested: Have your battery tested before cold weather hits. Most auto parts stores will test it for free, and it's much cheaper than a roadside rescue.
• Consider a Trickle Charger: If your car sits unused for days at a time, a trickle charger can maintain your battery's charge without overcharging it.

“The trick is to be proactive,” says Urbonas. “Don't wait until you're stranded to think about your battery's health.”

Kazimieras Urbonas, Supplier Excellence Manager at Ovoko, commented:

“Most drivers don't realize that small changes in their daily habits can add years to their battery's life, especially during cold weather. Something as simple as unplugging your phone charger or combining short trips into one longer journey can make a huge difference to your battery's longevity.

“Through my work with thousands of auto parts suppliers across Europe, I've seen how preventable most battery failures really are. The drivers who check their battery connections, avoid unnecessary electrical loads, and replace aging batteries before they fail completely rarely find themselves stranded.

“What surprises many people is that a battery struggling in cold weather often shows signs for weeks beforehand, such as slower engine cranking or dimmer headlights. By the time your car won't start, the problem has usually been building for a while. With proper care, most batteries can handle cold weather just fine.”