On March 19, 2026, Xiaomi launched the next-generation SU7 with three specific charging and range performance claims. This audit examines four of those claims. It does not evaluate competitive positioning, stock valuation, or design quality. It asks one question for each claim: does the available evidence support the stated figure, and under what boundary conditions?
The central finding is structural rather than numerical. Every major performance claim depends on a boundary condition that Xiaomi has not publicly defined. The headline number is real in the test environment. The test environment is not your operating environment. The gap between the two is not published.
// PLATFORM SPECS
| Parameter | Standard | Pro | Max |
|---|---|---|---|
| Peak Voltage | [C] 752V | [C] 752V | [C] 897V |
| Battery Capacity | [?] Not disclosed | [C] 96.3 kWh | [C] 101.7 kWh |
| CLTC Range | [C] 720 km | [C] 902 km | [C] Not specified |
| 10-80% Charge | [C] ~12 min | [C] ~12 min | [C] ~12 min |
| Peak Motor Output | [C] 235 kW | [C] 235 kW | [C] 508 kW (system) |
| Max C-Rate | [?] Not disclosed | [?] Not disclosed | [C] 5.2C |
| Battery Chemistry | [?] Not disclosed | [?] Not disclosed | [?] Not disclosed |
| Vehicle | Voltage / Power | Charge Speed | Boundary Published? |
|---|---|---|---|
| Xiaomi SU7 Max | 897V / ~1MW+ | 10-80% ~12 min | [?] No. Temp, charger, preconditioning not published |
| NIO ET9 | 925V / 600kW | Not specified | [?] No independent replication found |
| Zeekr 001 (2026) | 900V / 1.3MW | Not specified | [?] No independent replication found |
The pattern is consistent across all three 900V-class vehicles launched in 2025-2026. The audit finding for CP-01 through CP-03 is not a Xiaomi-specific failure. It is an industry-wide data disclosure gap.
CP-01: 897V Architecture vs. Public Charging Network
The 897V Max trim specification is a genuine architectural difference from Standard/Pro at 752V. At 897V, the same cable current delivers more than twice the power versus a 400V system. The audit question is not whether 897V works. It is whether the infrastructure to support it exists at scale.
China’s public charging network had approximately 4.8 million facilities at end-January 2026 [V — NEA data]. The prior EngiVolt Pro 800V Platform Audit found that 96-97% of public DC fast chargers cannot deliver 800V peak charging speed [V — EVCIPA data]. The 2026 SU7 launch does not change the composition of the public network.
Xiaomi has not published supercharging station totals, geographic coverage, or a rollout timeline as of March 28, 2026. No equivalent to BYD’s public 20,000-station target exists for Xiaomi.
CP-02: 12-Minute 10%-80% Charging Claim
The 12-minute figure is a specific, falsifiable number for a specific SOC window. This is an appropriate way to state a charging claim. However, three boundary conditions essential for evaluating the claim in any real deployment scenario are not published.
Ambient temperature at time of test: not stated. Charger model and power specification: not published. Battery preconditioning status: not disclosed. All three determine whether 12 minutes applies at your location.
C-rate analysis [I]: Pro 96.3 kWh pack, 70% SOC in 12 minutes requires approximately 332 kW sustained. At 897V this implies 370A sustained. Most public 200 kW DC chargers cannot sustain 330 kW for a full charge window.
Xiaomi completed an internal -39C cold-weather operational test in February 2026 [V — Dongchedi]. The vehicle operates in extreme cold. Charging speed under that condition was not disclosed. Surviving the cold is not the same as charging fast in it.
CP-03: 670 km Range in 15 Minutes Under Optimal Conditions
The qualifier “optimal conditions” has no published definition in any Xiaomi official communication as of March 28, 2026. Any number can be attached to “optimal conditions” if optimal is not defined. The qualifier is the audit finding.
Physical plausibility check [I]: 670 km at approximately 160 Wh/km equals approximately 107 kWh. Delivered in 15 minutes, this requires 428 kW average power. The Max pack at 101.7 kWh with 5.2C maximum charge rate implies a theoretical peak above 500 kW. Achievable at a dedicated high-power charger. Not achievable on standard public infrastructure.
CP-04: CLTC 902 km Range vs. Real-World Operating Range
CLTC is the mandatory range certification standard for passenger EVs sold in China. It features lower average speeds (~28 km/h) and more urban segments than WLTP or EPA, making CLTC figures systematically higher than real-world highway range.
On March 20, 2026, Yiche.com published an independent real-world range test for the 2026 SU7 Pro [V]. Comprehensive range: 785 km (87% of 902 km CLTC). Highway at 85 km/h: 327 km (72.5% of CLTC). Test conditions: 0-10C ambient, 24C cabin HVAC, dual occupant.
Comparable vehicles consistently show 30-40% reduction from CLTC to real-world highway. Applied to 902 km at moderate temperature and 110-120 km/h: estimated 540-630 km [I]. At -20C: estimated 350-470 km [I] based on 65-75% lithium-ion capacity reduction plus 3-5 kW heating load.
Monitoring Triggers
The following events will update the verdicts in this audit when they occur.
Range Planning Reference
| Variable | Value | Tag | Notes |
|---|---|---|---|
| CLTC (Pro) | 902 km | [C] | Standardized test. Not for route planning. |
| Highway 20C (110-120 km/h) | 540-630 km | [I] | Engineering inference. Yiche 85 km/h: 327 km supports range. |
| Highway -20C | 350-470 km | [I] | 65-75% capacity + heating load. No Xiaomi data. |
| Xiaomi supercharger 10-80% | ~12 min (boundary TBD) | [C] | Best-case ceiling, not operational default. |
| Standard 150kW public 10-80% | DATA NOT AVAILABLE | [?] | Xiaomi has not published off-supercharger times. |
Xiaomi SU7 (2026) Charging Performance Audit
Full 30+ page audit report -- four challenge points, C-rate analysis, cross-brand comparison, range planning parameters, six monitoring triggers. Data cutoff March 28, 2026. Post-audit update March 31, 2026.