Used EV Battery Checklist Before Export from China
A six-question battery review for used electric cars bought from China: state of health, charging history, thermal exposure, real range, pack integrity and what documentation travels with the car — and why no single percentage is published.
A used electric car is bought on the condition of one component, and that component cannot be inspected the way an engine can. You cannot see inside a sealed pack, and the number a seller quotes for its health is only as good as the method behind it. That is why we refuse to reduce the question to a single percentage.
What works instead is to split the battery into six questions, answer them separately, and let the buyer see which answers are solid and which are thin. The same method applies whether the car is a BYD Dolphin or a BYD SEAL 8 EV; the smaller and cheaper the car, the more the answer decides whether the trade is worth doing at all.
The car's own state-of-health readout
Most electric vehicles report a state-of-health figure through their own software, and that figure is the natural starting point. It is also the weakest evidence in the set on its own, because it is produced by the same software that manages the pack and it is reported without a method.
Capture it properly: the reading on screen, the VIN plate and the cluster in one continuous clip, at a known state of charge and a known temperature. A number photographed on its own cannot be tied to a car or to the conditions that produced it.
Charging history from the pack's previous life
Charging behaviour leaves the deepest mark on pack life, and it is the hardest thing to reconstruct from paperwork. Frequent fast charging on a hot pack accelerates ageing. So do long periods parked at a very high or very low state of charge, and repeated deep discharge. A single health reading reveals none of it.
Ask what the car's charge history shows, where that is available, and how the vehicle was used. A commuter car charged overnight at home presents differently from an ex-fleet car that was rapid-charged daily. Where the history is genuinely unknown, say so, and price the uncertainty rather than hiding it.
For context on how charging behaviour and pack chemistry are treated in the wider literature, the International Energy Agency's annual Global EV Outlook is a reasonable starting point. It is general material rather than a verdict on any car, and it will not tell you anything about the unit in front of you.
Thermal history, the factor sellers rarely volunteer
Battery ageing is temperature-driven, and the two events that matter most are sustained high temperatures and repeated fast charging in hot conditions. A car sold in a hot inland region and one sold in a cooler coastal region can show the same health figure and behave very differently after three more years.
On candidate units we ask for any record of thermal management faults, any stored high-voltage fault codes, and how the car was stored. A used electric car that has spent months stationary in high heat is a different purchase from one that has been driven and charged regularly. That difference should be disclosed before the deposit, not diagnosed after arrival.
Questions four to six — usable range, pack integrity and what travels with the car
Usable range is the question a buyer actually cares about, and it is not the same as the figure on the specification sheet. Ask for a real observed range at a stated state of charge, in a stated temperature, on a route that resembles the buyer's own driving.
Pack integrity covers the physical side: any record of impact, any underbody damage, and whether the pack has ever been opened or replaced. And the last question is what travels with the car. That means the charging equipment, the manufacturer documentation that supports a warranty claim in another country, and the software or account state the car is delivered in.
The reason no battery percentage is printed beside a listing
A single number invites a buyer to compare two cars on it, and two numbers produced by two different methods are not comparable. Printing one would also imply that we had verified it to a standard we cannot demonstrate for every unit.
What we publish instead is the factual listing data — model, year, recorded mileage, powertrain — plus the evidence we can actually produce on request for that specific VIN. The inventory page carries the live position, and the enquiry is where the battery conversation belongs.
Checks to run instead, in the order that matters
| Step | What you ask for | What it answers |
|---|---|---|
| 1 | Health reading filmed with VIN and cluster, at a stated state of charge | Whether the car's own software reports a plausible figure |
| 2 | Charging and usage history where any record exists | How the pack was treated rather than how it reads today |
| 3 | Stored high-voltage fault codes and thermal fault records | Whether something has already gone wrong quietly |
| 4 | Observed range on a stated route and temperature | What the buyer will actually experience |
| 5 | Pack integrity, impact and replacement history | Whether the pack is original and undamaged |
| 6 | Charging equipment and warranty documentation | What is usable after the car lands |
Steps one to three decide whether the unit is worth a diagnostic. Steps four to six decide the price. Running them in the other order wastes money on cars you were never going to buy.
Three electric units in our current stock, as examples of the range
| Vehicle | Year | Recorded mileage | Published price |
|---|---|---|---|
| GEELY PANDA MINI EV | 2026 | 0 | Price on request |
| BYD Dolphin | 2026 | 0 | Price on request |
| BYD SEAL 8 EV | 2026 | 0 | Price on request |
The three sit at very different points in the market, and the verification budget should follow the same shape. On the smallest car the battery question is the whole decision. On a large electric SUV it is one of several, alongside whether your market can support the model at all.
Battery questions we cannot answer from a listing
Will you send a diagnostic report for a specific electric unit?
Yes, on request and against a named unit, with the reading, the date and the conditions. We will not present it as a warranty of future pack life, because it is not one.
Is a low-mileage electric car automatically a safe buy?
No. Low mileage with long stationary periods at a high state of charge can be harder on a pack than moderate mileage with careful charging.
What happens if the battery fails after arrival?
That is a destination-side question about warranty coverage and local service, and it should be settled with your own market before you order rather than assumed from an export sheet.
Do you sell electric cars to markets without charging infrastructure?
We will quote them, and we will also tell you when we think the order is unlikely to resell. The second answer is the more useful one.
If you are considering an electric unit, send the listing and the market it is going to, and we will tell you what evidence exists for that specific car today.
See the electric units currently listed · Read how our condition evidence is produced · Ask what battery evidence exists for one VIN