How to Check a Used Chinese EV Battery Before Export in 2026

Buyer rule for 2026: do not wire money for a used Chinese EV until you see a BMS state-of-health scan showing 88% or better. Below 85%, budget for a pack repair or walk away. This one report matters more than paint, mileage or trim.

Sellers know buyers cannot easily verify a battery from photos. That asymmetry is where deals go wrong. A car can look perfect and still hide a weak module.

What is battery state of health?

State of health (SOH) is the current usable capacity of a battery expressed as a percentage of when it was new. A 60 kWh pack rated at 95% SOH still delivers about 57 kWh. The BMS — the battery management system — calculates this and exposes it through a diagnostic tool. SOH is not shown on the dashboard. You need a dealer-level scanner or the car’s service app.

How do you get a real battery report?

Ask the exporter for a screenshot of the BMS SOH, cell voltage spread and module temperatures.

Cell spread above 0.05V suggests imbalance and future range loss.

Request the highest and lowest cell voltages, not just the average.

Cross-check the odometer against the degradation curve — a 20,000 km car at 82% SOH has been abused or fast-charged heavily.

For LFP packs like those in BYD and Geely models, degradation is slow and predictable. The 2025 Li Auto L6 Pro runs an extended-range setup, so its battery cycles less than a pure EV’s and tends to age better. EREVs and PHEVs like the 2024 Li Auto L6 Pro and the 2022 BYD Han DM-i put more load on the engine over time, so check engine hours too — those are often omitted.

What claims should you distrust?

“Range like new” means nothing without a number. Sellers also quote CLTC range as if it were real-world. Expect 20-25% less in mixed driving. And be wary of cars sold with a “new battery” that lack the replacement invoice — a cheap third-party pack can be worse than the original.

If you cannot get a scan, the honest move is to price the risk in: subtract $4,000-$7,000 from market for the possibility of a pack repair. Buyers who skip this step are the ones who post angry threads six months later.

Key Takeaways

• Require a BMS scan showing 88% SOH or higher before paying.
• Check cell voltage spread — above 0.05V signals imbalance.
• Treat CLTC range as optimistic; subtract 20-25% for real use.
• No scan means pricing in $4,000-$7,000 of risk, or walking away.