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Chinese EVs in deep cold: what the evidence actually says
Separate BYD’s Nordic observations, Polestar’s Canadian test and BYD’s published heat-pump claims
Data snapshot: October 13, 2026. Independent research; not a manufacturer website or buying advice.
Canadian reality: there is no single winter range penalty
In the Canadian Automobile Association’s 2025 road test at roughly −7°C to −15°C, tested EVs covered 14–39% less distance than their corresponding NRCan rated values. The Polestar 2 in that test reached 384 km against its own test reference of 444 km, a 14% difference. Polestar has ties to Geely Holding but is not Geely Auto, and this historic test car is not the same version as newer database listings.
China-branded vehicles: Nordic trials are real, but not Canadian
Norway’s NAF measured a 10–80% DC charging session of 41 minutes 53 seconds for the BYD SEAL U Design in winter 2025. In winter 2024 NAF also identified the BYD DOLPHIN among relatively efficient vehicles in that test group. These are useful independent observations. However, the available BYD SEAL, DOLPHIN and Geely EX5 records on this site have no verified Canadian-specific independent winter test, and European test baselines must not be transposed to Canadian EPA figures.
Thermal management: the heat pump is not an endurance certificate
BYD states that the heat-pump system of its European-market SEAL is designed to work across −30°C to 60°C and recover some powertrain waste heat. That temperature describes the system’s specified operating envelope, not the vehicle’s remaining range or DC charge speed at −30°C. LFP chemistry, a heat pump and battery preconditioning each address different technical problems, and their effect needs to be measured at vehicle level.
What Ontario readers should look for next
A comparable Canadian study would identify the exact trim, tyre size and winter tyres, initial state of charge, ambient and battery temperature, speed and route, preconditioning, cabin heat settings and the DC charging window. Natural Resources Canada also recommends plugged-in preheating and, where available, energy-efficient heating. Until matching test data appears, the correct status for an overseas Chinese EV is “winter performance unverified in Canada,” not “excellent” or “poor.”