BYD charged one car 350 times in nine days

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August 28, 2026, 7:40 AM

• •BYD says the Yangwang U7 completed 30,000 kilometres with 350 ultra-fast charging stops in nine days.
• •The company claims the battery retained 98.7% of its original capacity after the test.
• •The car reportedly ran at 240kph on a Nanning test track in 36C average ambient temperatures and charged at up to 640kW.
• •The article notes that a nine-day stress test cannot demonstrate long-term calendar ageing of a battery pack.
• •Euro 7 will require new EV types in Europe to retain 80% capacity after five years or 100,000 kilometres, and 72% after eight years or 160,000 kilometres.

BYD says a randomly selected Yangwang U7 was driven 30,000 kilometres in nine days, charged 350 times at up to 640kW, and retained 98.7% of its battery capacity. The company ran the car at 240kph on a test track in Nanning in average temperatures of 36C to stress the battery under harsh conditions. The article argues that while the result is encouraging for ultra-fast charging durability, such a short test cannot measure calendar ageing over years. It frames the demonstration against Europe’s upcoming Euro 7 rules, which will require EVs to retain 80% battery capacity after five years or 100,000 kilometres and 72% after eight years or 160,000 kilometres.

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