AUTONEWS

Winter could cut electric air taxi range by up to 22%, simulations suggest
Freezing temperatures can steal a surprising chunk of an EV's range. Here's what's really happening when the mercury drops.
Lithium-ion batteries work through chemical reactions that slow as temperatures fall. Cold conditions increase resistance inside the battery and can temporarily reduce how efficiently it delivers power. Once the pack warms, much of that lost performance returns. This is different from permanent battery degradation, which develops over time and depends on factors such as age, use and heat exposure.
In a petrol car, waste heat from the engine can warm the passenger cabin. Electric vehicles produce far less waste heat, so they must use electricity for cabin comfort. Some rely on resistance heaters, while others use heat pumps that can provide warmth more efficiently in many conditions. Defrosting windows, heating the battery and keeping passengers comfortable all add to winter energy demand.
The US Department of Energy has explained that low temperatures affect both battery performance and the energy required to heat the cabin. The exact impact varies widely with vehicle design, driving speed, trip length, weather and heating settings. A single percentage quoted online should not be treated as a reliable prediction for every model.
Short journeys can be particularly inefficient...A driver making several five-minute trips may see a bigger winter penalty than someone travelling steadily for an hour. Each departure can require another burst of energy to warm the cabin and battery. On a longer drive, those initial heating costs are spread over more distance. Highway speed, strong headwinds and wet or snowy roads can further increase consumption, regardless of whether a car is electric or petrol-powered.
Preconditioning makes a practical difference...One of the simplest ways to improve winter comfort is to warm the vehicle while it is still plugged in, if the model supports that function. Scheduled departure settings can prepare the cabin and, on some vehicles, the battery before the journey begins. Using electricity from the charger rather than the battery for part of this work may leave more stored energy available for driving.
Drivers should consult their owner’s manual because battery...preconditioning, charging limits and departure scheduling work differently across manufacturers. Some cars automatically prepare the battery when a fast charger is selected in navigation. Others require specific settings or do not offer the feature.
Small changes can protect useful range...Heated seats and steering wheels can sometimes keep occupants comfortable while allowing a lower cabin temperature, although clear windows and safe visibility must come first. Maintaining manufacturer-recommended tyre pressures also matters: pressure typically falls as ambient temperatures drop, and underinflated tyres increase rolling resistance. Smooth acceleration and moderate speed can reduce consumption on cold roads.
It is also wise to plan charging stops with a buffer rather than relying on the dashboard’s range estimate as a guarantee. That figure responds to recent driving patterns and can change quickly after a motorway stretch or a shift in weather. Public fast charging may initially be slower when the battery is very cold, especially if the vehicle has not preconditioned its pack.
What buyers should compare before choosing an EV...Official range ratings are useful for comparing vehicles under standardised test conditions, but they are not promises of real-world winter performance. Shoppers in colder climates should look beyond the headline figure and consider whether the car includes a heat pump, battery thermal management, departure scheduling and dependable charging-route planning. Independent cold-weather tests can add context, provided the conditions and test methods are clear.
The important distinction is between temporary seasonal range loss and long-term battery health. Winter usually changes how much energy the car can use efficiently on a particular trip; it does not automatically mean the battery has worn out. With realistic expectations, a charging buffer and a few adjustments to daily routines, most drivers can manage the colder months without treating every falling range estimate as a warning sign.
If you've ever started an EV on a freezing morning and wondered where all those missing miles went, you're not imagining it. Electric vehicles can lose a substantial amount of driving range in cold weather, sometimes enough to make a familiar trip suddenly require a charging stop.
The battery is part of the reason, but it is not the whole story. Cold temperatures affect the battery's chemistry, while heating the cabin and bringing the battery up to its preferred operating temperature also consume electricity. Put all of that together, and winter can be a serious hit to an EV's efficiency. So why does cold weather have such an outsized effect on an electric car?
Cold temperatures make the battery less efficient...An EV's battery doesn't stop working when temperatures drop. Instead, the chemical reactions that allow it to store and release energy become less efficient.
Lithium-ion batteries rely on the movement of ions through an electrolyte. When the battery gets cold, that process becomes more difficult, limiting how quickly and efficiently the battery can deliver energy.
The U.S. Department of Energy's research found that battery chemistry is one of the factors behind reduced EV range in cold conditions. Its analysis found that battery-electric vehicles could see range reductions of around 41 percent at 20°F under the tested conditions.
That's also why an EV may behave differently immediately after being parked outside overnight than it does after you've been driving for a while. As the battery warms up, some of that performance penalty can diminish. Importantly, this doesn't mean the battery has suddenly lost 40 percent of its permanent capacity. Much of the winter range reduction is temporary.
Heating the cabin takes energy from the battery...Here's the part that can surprise people. A gasoline engine produces plenty of waste heat while it's running. A conventional car can use some of that heat to warm the passenger compartment.
An EV doesn't have a hot internal-combustion engine producing the same readily available supply of waste heat. Instead, it has to use electrical energy to heat the cabin. And when it's really cold outside, that heater can run for a significant portion of the trip.
AAA's 2019 testing found that operating an EV's HVAC system at 20°F reduced average driving range by 41 percent compared with its 75°F baseline.
The Department of Energy similarly identifies HVAC energy use as a primary reason cold weather affects EV range. Its analysis says the power required for heating rises as outside temperatures move farther from a comfortable cabin temperature. That's why an EV can use considerably more energy simply keeping its occupants warm than it would on a mild day.
It would be easy to assume that turning off the climate control would solve the problem. It wouldn't. Cold weather affects several parts of the vehicle at the same time.
-Battery chemistry: A cold battery is less efficient at delivering usable energy
-Cabin heating: Electricity is required to keep passengers warm
-Battery conditioning: The vehicle may consume energy warming the battery to an appropriate operating temperature
-Regenerative braking: Some EVs reduce regenerative braking when the battery is too cold
-Tires and roads: Cold temperatures, snow and slush can increase rolling resistance
-Driving conditions: Winter winds, precipitation and slower traffic can further increase energy consumption
AAA's latest testing specifically found that battery conditioning and cabin heating represented a dominant share of energy consumption during cold operation, particularly in urban driving. That combination explains why winter range loss can be so noticeable even when the battery itself hasn't suffered any permanent damage.
Heat pumps can make a big difference...Not every EV handles winter temperatures exactly the same way. One of the technologies that can help is a heat pump. Rather than relying entirely on electrical resistance to create heat, a heat pump transfers available thermal energy, allowing the vehicle to heat the cabin more efficiently under appropriate conditions.
That's one reason newer EVs can perform differently from older models in cold weather. There are still limits, though. A heat pump can't completely eliminate the effects of cold battery chemistry, and extremely low temperatures can make thermal management more demanding.
Drivers can also reduce some of the penalty by preconditioning the vehicle while it's plugged in. Instead of using battery energy to warm the cabin and potentially the battery after leaving home, the vehicle can draw that energy from the electrical grid before the trip begins.
Winter range loss doesn't mean your battery is dying...Perhaps the most important thing for EV owners to understand is that a dramatic winter range reduction is not necessarily a sign of battery degradation.
Cold weather can temporarily reduce how much energy the battery can use efficiently, while heating the cabin and conditioning the battery consumes additional electricity. Once temperatures return to more moderate levels, much of that lost range returns.
The numbers can be significant. In AAA's 2026 testing, three EVs experienced range reductions of 25.3, 44.8 and 47.0 percent, respectively, when tested at 20°F versus 75°F. The overall average reduction across the EVs tested was 39 percent.
That's a wide spread, and it illustrates an important point: there is no universal winter range penalty for every EV. Battery size, thermal-management system, heat-pump configuration, vehicle efficiency, speed and climate-control settings can all change the result.
So if your EV normally shows 300 miles of range and winter turns that number into something much lower, don't immediately assume something is wrong with the battery. Cold weather is essentially making the car spend more of its stored electricity just to operate normally.
Simulations indicate that winter conditions could reduce the range of electric air taxis (eVTOLs) by up to 22%, due to the impact of low temperatures on the aircraft's total energy consumption.
Why does cold weather reduce the range of eVTOLs?
• Interconnected thermal management: In electric vertical take-off and landing (eVTOL) aircraft, the propulsion system, batteries, and cabin subsystems all draw from the same limited energy source.
• Heating demand: Low temperatures require additional energy to heat the battery—maintaining its efficiency and performance—and to regulate the temperature in the passenger cabin, thereby reducing the energy available for flight.
• The need for planning: The study suggests that future urban air mobility operations will require temperature-sensitive flight planning, incorporating heating and cooling requirements into the scheduling of routes and flight distances.
Cold weather reduces the effective flight range of electric air taxis (eVTOLs) by up to 22% because the aircraft must balance a limited energy supply across interlinked propulsion, battery, and cabin heating systems.
Why cold weather reduces range:
• Sluggish Battery Chemistry: Lithium-ion batteries rely on chemical reactions to generate electricity. Lower temperatures increase internal resistance and slow down ion movement through the electrolyte, meaning the battery delivers less usable energy.
• Competing Thermal Demands: Unlike gas-powered aircraft or cars that produce abundant waste heat, electric aircraft must use stored battery power to heat the passenger cabin and manage component temperatures.
• Interlinked Subsystems: In an electric vertical takeoff and landing (eVTOL) aircraft, the propulsion, battery, and cabin subsystems share the same restricted energy pool. Diverting energy to thermal management directly shortens the distance the aircraft can fly.
• Thermal-Aware Planning: According to research published on U.S. Department of Energy, modeling thermal-management architecture is critical, and future operations will require "thermal-aware flight planning" rather than calculating range strictly by distance.







