A Xiaomi SU7 owner in China may have just delivered one of the most convincing long-term battery tests we’ve seen outside a lab. After driving an astonishing 265,000 km (165,000 miles) in just 18 months, the SU7 Pro’s battery still shows 94.5% health—numbers that would impress even the most skeptical EV critics.
The data, first reported by CarNewsChina, comes from Mr. Feng, a high-mileage driver averaging around 600 km per day. That’s the kind of usage most EVs might experience over five or six years—compressed into a year and a half. His SU7 Pro’s 94.3 kWh battery has likely gone through the equivalent of 500+ full charge cycles, yet degradation remains remarkably low.
Put into context, this result looks even more striking. Tesla typically warranties Model 3 and Model Y batteries for 8 years or 160,000 km, allowing capacity to drop as low as 70%. Most automakers accept 20–30% degradation over similar distances. Feng’s SU7 has already exceeded many warranty mileage limits by more than 60%, while losing just 5.5% capacity.
The story quickly went viral on Chinese social media, catching the attention of Lei Jun, who shared it himself. Feng, meanwhile, isn’t slowing down—he’s targeting 600,000 km within three years, while noting fuel savings exceeding 100,000 yuan compared with combustion vehicles.
Final take: One high-mileage case doesn’t rewrite the rulebook—but it does rewrite expectations. If results like this become common, battery longevity may soon stop being the biggest question mark around electric vehicles altogether.
