Obtaining precise internal resistance at different SOC levels requires disassembling the battery pack and connecting it to a professional charge-discharge cabinet for several days of cycling tests. This is beyond the scope of non-destructive used car inspections; we only provide real-time estimated internal resistance data based on OBD port readings.

We can purchase the hardware (diagnostic device) on your behalf. However, the original online diagnostic accounts (especially those involving anti-theft programming and module matching) have strict domestic IP location and real-name authentication restrictions, making it very difficult to log in stably from overseas for a long time, and we cannot guarantee technical support for this.

China has centralized vehicle records you can check remotely before paying anything. Ask the exporter for the 17-digit VIN, then request two reports. First, the maintenance history: third-party platforms pull 4S dealership records showing service dates, mileage and repair items. A mileage line that goes down over time is a red flag for odometer tampering. Second, the insurance claim history: it lists accident dates, claim amounts and repaired parts. Heavy claims involving frame rails or airbags should end the deal. Practical tips: run the reports yourself instead of accepting screenshots from the seller, make sure the report date is close to the delivery date, and cross-check with physical wear such as the steering wheel, pedals and seat bolsters, which cannot lie about high mileage. Keep in mind that small private repairs never enter these databases, so combine history checks with a physical inspection before shipping.