Driving an electric car in winter: range, preconditioning and charging at home

Short answer: In winter an electric car typically loses roughly 10–30% of its range in mild conditions, and more in hard frost and on short trips. Most of the loss comes from heating the cabin, the rest from a cold battery working more slowly. The most effective habit is to warm the car up while it is still plugged in at home (preconditioning): the energy comes from the grid, not the battery. Overnight AC charging at home leaves you with a warm battery and full range in the morning. DC fast charging is slower with a cold battery, so the battery needs to be prepared on the way to the charger.

What happens in a cold battery (simply put)

In a lithium-ion battery, energy moves as ions travel through a liquid electrolyte. In the cold this liquid thickens, the ions slow down and the battery's internal resistance rises. As a result:

• The battery can deliver and accept less power at once.
• Charging and regenerative braking are limited; on many cars regeneration is reduced on cold mornings.
• A large part of the energy is not lost: it becomes usable again as the battery warms up. The real loss is the energy spent heating the cabin and the battery.

So in winter it is more accurate to say "energy goes into heating" than "the battery got smaller". For range in general, see the electric car range guide; here we focus on what to do in winter.

How much loss to expect

There is no single number; the car, a heat pump, speed and trip length decide. The general picture from tests:

• Mild winter (around 0 to 10 °C): mostly 10–30% less range.
• Hard frost (several degrees below zero and colder): the loss grows.
• Short, frequent trips: the cabin warms up again every time; this is where the loss per kilometre is highest.
• Long trips at steady speed: warming up happens once, so the relative loss is smaller.

Preconditioning: the most effective winter habit

Preconditioning means setting a departure time in the app or on the screen so the cabin and battery are warmed in advance.

1. Do it while plugged in: the heating energy comes from the grid and your morning range is preserved.
2. Set the departure time: most cars plan heating and the last part of charging around it, so the battery starts warm.
3. It also defrosts the windows: no scraping, better visibility.
4. It also works unplugged, but then the energy comes from the battery.

When charging from a low-power socket, preconditioning can take most of the available power, so charging slows down. A wall-mounted charger (wallbox) easily covers heating and charging at the same time. See what is a wallbox.

Why overnight home charging helps in winter

• The battery warms a little while charging; if charging ends close to departure, it is still warm in the morning.
• Instead of driving to a public charger in the cold and waiting, you leave every morning with a full, warmed car.
• Overnight AC charging stresses the battery less than frequent DC fast charging.
• A garage or covered parking keeps the battery warmer; if you park outside, leaving the car plugged in helps on many models.

The EV charger finder shows in five questions which power suits your car and your supply, and the charging cost calculator shows what home charging costs.

Why DC fast charging is slower in the cold

A cold battery cannot safely accept high currents, so the car deliberately lowers the charging power. Not seeing the advertised power at a fast charger in winter is normal.

• Set the charger as your navigation destination: many cars then warm the battery on the way.
• Charge at the end of a long drive: a battery warmed by driving charges faster than a car that has been parked in the cold.
• Charging above 80% is slow in every season; in winter you feel it earlier.

We cover the effect on battery health in does DC fast charging damage the battery?

Short winter checklist

• Use seat and steering wheel heating: it uses far less energy than heating the whole cabin, so you can keep the cabin a degree or two cooler.
• Heat pump: cars with a heat pump heat the cabin with less energy than with a resistive heater; worth considering in a cold climate.
• Tyre pressure: it drops in the cold (roughly 0.1 bar per 10 °C). Restore the manufacturer's value; winter tyres also add a little consumption.
• Keep daily charging between 20 and 80%, and do not leave the car at a low state of charge for long in severe cold.
• Check the charging flap: if it freezes, preconditioning usually frees it; never pour hot water on it.
• Keep the cable dry: a cable stiff with cold does not coil easily; store it without kinks.
• Drive a little slower: on the motorway a few km/h makes a bigger difference in winter.

Chargers installed outdoors

An outdoor wallbox must have a protection rating suitable for outdoor use, and its circuit needs its own breaker and residual current device. Do not leave the cable and plug lying in puddles. In Bursa, ENGN installs chargers after a paid site survey and with a project; see the EV charger installation page. Elsewhere, local rules apply.

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