If you want to understand the future of electric cars, sometimes it helps to look not at shiny auto-show concepts but at a very tired driver and a very not-tired battery.
Somewhere in China, a Xiaomi SU7 owner known online as Feng has quietly done what most EV skeptics insist can’t be done: he drove his electric sedan 265,000 kilometers in just 18 months—nearly the distance from Earth to the Moon—and the battery still looks like it just finished its break-in period.
According to a diagnostic report issued by Xiaomi’s own service center, the SU7’s 94.3-kWh pack is still holding 94.5 percent of its original capacity. In battery-speak, that’s astonishing. Feng averaged almost 500 kilometers per day, every day, for a year and a half. That’s the kind of usage that normally turns lithium-ion packs into cautionary tales. Instead, this one came back with barely a wrinkle.
To put that number in perspective, most automakers promise that after eight years or roughly 150,000 to 160,000 kilometers, your EV battery won’t degrade more than 20 to 30 percent. Tesla, for example, guarantees its Model 3 and Model Y will retain at least 70 percent capacity over that span. Feng’s SU7 has already blown past those mileage figures—and it’s still sitting north of 94 percent.
A High-Mileage Stress Test
The service report suggests the battery has gone through roughly 506 full charge cycles. That’s not light use. That’s the sort of cycling you’d expect to expose weaknesses in cell chemistry, thermal management, or charging strategy. Instead, the SU7’s pack seems to be taking it in stride.
And it’s not just the battery that’s holding up. Xiaomi’s technicians also noted that Feng hasn’t needed a brake-pad replacement yet, a reminder of how effective regenerative braking can be when used this heavily. Even the cooling system passed with flying colors—the coolant showed no water contamination, a detail that quietly signals good long-term system integrity.
In other words, this SU7 isn’t just surviving. It’s aging gracefully.
Why This Matters
Xiaomi may be new to the car business, but this kind of real-world data is exactly what separates marketing promises from engineering reality. Anyone can quote lab numbers. Feng delivered something far more valuable: a brutal, everyday stress test.
High-mileage EVs are still rare enough that every one of them becomes a rolling experiment. And this experiment suggests that Xiaomi’s battery management and thermal systems are doing something very right. If a pack can keep more than 94 percent of its capacity after 265,000 kilometers of near-constant driving, that’s not a fluke—that’s a design philosophy paying off.
The Road to 600,000
Feng isn’t done. His next target is 600,000 kilometers, which he expects to reach within three years. When he gets there, he plans to publish another full wear-and-tear report, effectively turning his SU7 into one of the world’s most documented long-term EV tests.
If the battery keeps degrading at this rate, that future report might be even more impressive than the first.
And for an industry still fighting doubts about durability, that may be the most important data point of all.
Source: Xiaomi; Photo: EPA-EFE
