Rapid Charging Slows Right Down in the Cold, and the Car Does It on Purpose

The car’s battery management system sets how much power a cold battery accepts at a rapid charger, lower than on a mild day. A US government laboratory’s model of one fleet of 2012 Leafs puts the charge reached after 30 minutes 22 to 36 per cent lower at 0 degrees than at 25. Nissan’s 2023 UK handbook estimates double the middle time or more at either end of its 40 kWh gauge.

Key takeaways:

• A cold battery can limit its own charging rate, whatever power the charger can deliver.
• Nissan’s 2023 UK handbook estimates over 80 minutes to reach 80 per cent at either end of the 40 kWh Leaf’s gauge, against about 40 in the middle, depending on charging conditions.
• Warming the battery before the plug goes in shortens the charge, and the makers say what that costs.

Who Is Holding the Rate Down

The limit sits in the car’s software, and the makers say so in their own handbooks and help pages. Hyundai quotes its rapid-charging times at room temperature, and Volkswagen quotes its maximum power at about 23 degrees.

The Car Sets the Charging Limit

Renault states the rule in its UK help pages: “If the battery is too cold, the management system limits the power to protect the components.” Renault adds: “As a result, charging time increases, especially at DC fast-charging stations.” Renault gives wear and safety as the reasons.

Other makers agree. Kia UK writes: “When a cold battery is plugged into the charger, it may charge slowly initially to avoid damage.” Tesla’s current Model Y manual shows a blue snowflake on the screen when the battery is cold and adds: “During these cold weather conditions, charging rates may also be limited.” Nissan’s UK handbook describes safeguards that protect the battery and lengthen the charge.

Idaho National Laboratory, a US Department of Energy laboratory, describes the same mechanism: the management system holds the rate down so the cells come to no harm. A second limit arrives as the battery fills, when the car cuts the current near full for a voltage reason, not a temperature one.

The Times on the Brochure Are Best-Case

Hyundai UK’s 2022 IONIQ 5 handbook gives 10 to 80 per cent in about 18 minutes on a 350 kW charger and about 63 minutes on a 50 kW charger for the standard battery, 69 for the extended one. Each time is quoted at room temperature, and the page says ambient temperature changes it.

Volkswagen’s Irish site says the maximum charging power of its ID. models is calculated at about 23 degrees and a 5 per cent charge. An ID.3 Pro with a battery at 20 degrees and 10 per cent charge can reach 100 kW. At 0 degrees and the same charge the power drops well below that at the start of the charge and climbs as the pack warms.

The Idaho authors made the same complaint about the 2012 Leaf, whose manual promised about 30 minutes for 10 to 80 per cent. They wrote: “EV manufacturers typically only provide rough approximations of charging duration to the public, without specifying the range of conditions in which that said performance is accurate.”

How Much Slower a Cold Rapid Charge Is

One US laboratory paper and one UK handbook put numbers on the cold. Each comes with limits that decide how far its figure travels.

What the US Government Laboratory Measured

Idaho National Laboratory’s paper, published in the journal Energy Policy in 2018, used data from 2012 Nissan Leaf taxis in New York City. They charged at two 50 kW rapid chargers in Manhattan, and the car’s data loggers recorded each charge from June 2013 to February 2015.

The paper’s model predicts, at 95 per cent confidence, that the charge level reached after 30 minutes is between 22 and 36 per cent lower at 0 degrees than at 25 degrees. The figure describes the charge level reached in half an hour and says nothing directly about extra minutes.

The authors also ran the model across the lower 48 US states. From a 20 per cent start on a median-temperature day, the charge level after 30 minutes came out between 49 and 74 per cent by region. In severe cold, many real charges ran to the chargers’ 60-minute cutoff.

The limits are the authors’ own. The data cover one car, the 2012 Leaf, and the authors write that other models differ. They cover one city, 50 kW chargers, charges of 1 to 60 minutes and temperatures down to about minus 9 degrees. Air temperature stood in for battery temperature, which sets the rate.

What Nissan’s UK Handbook Adds

Nissan’s UK handbook for the 2023 Leaf, the previous generation, ties charging time to a battery temperature gauge. On the 40 kWh car the estimate for reaching 80 per cent is about 40 minutes in the middle of the gauge and over 80 minutes at both ends, about twice the middle figure or more.

Nissan labels the times as depending on charging conditions. The page does not say which end of the gauge is cold; the sentence above the table says charging can take longer when the battery is too hot or too cold.

The 60 kWh table runs from about 45 to 60 minutes in the middle to over 150 at one end and over 90 at the other. The handbook limits the 40 kWh car to 50 kW from any charger. A second quick charge in a row can run longer when battery temperature has triggered the safeguards; the page does not say whether heat or cold does it.

What Brings the Speed Back

Warming the battery before the plug goes in is the makers’ remedy. Some cars warm it themselves on the charger, and every method uses energy.

Warm the Battery on the Way to the Charger

Kia UK says the usual route is setting the charger as the destination in the satnav, which starts warming the battery on the drive. Kia says the battery’s usual best range is about 15 to 35 degrees, recommends pre-conditioning most when temperatures fall below 10 degrees, and gives 20 to 30 minutes as the usual time. Tesla’s Model Y manual recommends at least 30 to 45 minutes of route guidance to a charger.

Kia says readying the battery for a charge is a different job from warming the interior. Tesla’s manual says that without a scheduled precondition the Model Y warms the battery only when it is too cold to charge, and does not prepare the cabin.

Warming costs energy. Hyundai’s IONIQ 5 handbook says its winter mode can reduce driving distance, as the energy raises the battery temperature. Nissan’s 2025 Leaf handbook says running the heater while driving uses more power and can cut range. Kia calls the energy used minimal and says a plugged-in session draws on the mains, not the battery. No maker page read here gives the minutes saved or the energy used.

When the Car Warms It Itself, and When You Plan Around It

Some cars warm the battery on the charger. Hyundai’s IONIQ 5 battery warmer runs automatically when the charging connector is connected, and the handbook says charging time can shorten but the electricity charge can rise. Nissan’s 2025 Leaf heater switches on in a cold rapid charge and draws on the charger’s power, with a gain that varies by temperature and charge level. Hyundai says its winter mode is for vehicles with a battery heater, so not every car has the help.

Volkswagen’s rules for the cold: expect a slow start that climbs as the pack warms, park under cover, and begin a rapid charge at a low charge level, stopping at 50 or 80 per cent. Volkswagen UK says frost lengthens charging time, so stops should allow for it.

The cold also costs range, a loss of its own. On one Peugeot SUV’s published figures, a heat pump is worth about ten degrees of winter, measured in range, a question apart from charging speed.

The same car on the same rapid charger can charge at its best rate or well under it, and the difference sits in the battery’s temperature. The owner can influence it only before arrival. Set the charger as the destination in the satnav where the car allows it, allow the time the makers name, 20 to 30 minutes for Kia and at least 30 to 45 for Tesla, and expect a slow start that climbs.

Want more car content? Add us as a preferred source on Google to your favourites list for the best automotive news and analysis on the internet.

If you enjoyed this article, be sure to follow us on Microsoft Start.

Reviewed by Preetam Gadekar