The 12V battery is small but critical: when it dies, the car cannot start, unlock, or charge. Used EVs often have weak 12V batteries because they sit on lots for months. Before shipping, ask the exporter to: 1. Measure the battery voltage after the car has rested overnight. It should read around 12.4-12.8V; anything under 12.2V means the battery is degraded. 2. Start the car and check that the charging system holds 13.8-14.4V, confirming the DC-DC converter works. 3. Scan for stored fault codes related to low voltage, which indicate the battery has been deeply discharged repeatedly. During ocean freight, the battery slowly self-discharges. Ask that it be disconnected or kept on a maintainer before loading, and budget for a replacement after arrival if the battery is over 3 years old. A new 12V battery costs little compared to being stranded at the port.

Apply for a certificate of origin from the local customs or trade promotion agency, proving that the country of manufacture is China. This is a necessary document for customs clearance in regions like the Middle East and Southeast Asia.

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.