When you sell an electric vehicle, a buyer may reasonably ask what you know about the traction battery. The difficult part is answering clearly without turning a single scan into a promise. A useful battery data record does not certify a vehicle, predict its future performance or replace an independent inspection. It gives both sides a dated snapshot of information that can be discussed in context.
That distinction matters. A screenshot with one number can invite more questions than it answers: when was it taken, what was the state of charge, were any warnings present, and what did the scanner actually read? Preparing a calm, complete record before you advertise the car helps you explain what was observed while leaving room for the buyer to make their own checks.
Why a record is more useful than a headline figure
It is tempting to lead with state of health (SOH), but SOH is only one item of battery information. The value of a pre-sale record comes from showing the circumstances around the reading as well as the reading itself. A buyer can see that the data belongs to a particular date and vehicle condition instead of treating it as a timeless verdict.
A clear record also keeps the conversation factual. You can say that a scan displayed a value or a stored diagnostic trouble code (DTC); you should not say that the reading proves the battery is fault-free, guarantees range or confirms the value of the car. Scan data is information for diagnosis, not a repair diagnosis by itself. A prospective buyer may still choose to arrange an independent inspection, and that is a sensible part of a transparent sale.
Record the conditions of the scan
Begin with the simple details that let somebody understand the snapshot later. Note the date, the odometer reading shown by the vehicle, the displayed state of charge (SOC), any dashboard warnings you observed, and whether the car was being prepared for sale. Include the vehicle identification details you are comfortable sharing with the buyer, but keep personal account information and private location details out of a public listing.
It is also helpful to state that the report was obtained through the vehicle's OBD2 connection and to retain the original output where practical. Do not edit a report to make it look more conclusive than it is. If a reading was taken after a normal journey, before charging, or when the car was parked, write that down in plain language. The aim is not to prescribe a test procedure; it is to avoid presenting isolated data without its basic context.
Capture the data categories and their limits
Depending on the vehicle and the compatible tool, a battery scan may show SOH, cell-level battery data, charge and discharge statistics, DTCs and live data. These categories can be useful to record because they describe different parts of the information available from the vehicle. They are not a checklist that automatically produces a pass or fail result.
For example, an SOH value may help a buyer understand what the vehicle reported at the time of the scan, but it is not a battery certificate. Cell-level information can add context, but it should not be used to diagnose a defect from one reading. Charge and discharge statistics may be relevant background, while live data is a momentary observation rather than a forecast. If DTCs appear, preserve their wording and avoid clearing them merely to make a report look cleaner. A DTC is a clue that needs appropriate interpretation, not a confirmed repair plan.
If the car displays a warning or you notice an abnormal condition, do not use the sales record to minimise it. Follow the vehicle instructions and seek help from a qualified technician where appropriate. Do not attempt high-voltage battery disassembly or repair as part of preparing a vehicle for sale.
Build a transparent pre-sale pack
A buyer-friendly record can be short and orderly. Keep the original scan output alongside a plain-language note that identifies what was observed and what was not assessed. The following structure is practical without making claims beyond the data:
- Date of the scan and vehicle mileage at the time.
- Displayed SOC and any relevant dashboard messages observed during the check.
- The available battery data categories, such as SOH, cell-level readings, charge and discharge statistics, DTCs and live data.
- Any stored DTC text exactly as reported, with no unsupported diagnosis attached.
- A clear limitation statement: this is a scan record, not a guarantee, certification or substitute for an independent inspection.
Presenting information this way protects the quality of the discussion. It lets you answer reasonable questions about the vehicle without presenting yourself as a battery repair specialist. It also makes it easier to compare a later scan with the pre-sale snapshot, provided the reader understands that conditions may differ.
Choose a compatible tool before collecting data
The tool must match the vehicle before its readings can be useful. For selected BYD EVs, the TopTekk TTB030 Power Battery Scanner for BYD EV reads battery SOH, cell-level battery data, charge and discharge statistics, DTCs and live data through OBD2 via Bluetooth. The store lists Atto 3, Dolphin, Seal and Sealion 6 as compatible BYD models, but you must verify the exact vehicle before ordering. It is a one-time purchase with no monthly subscription and includes a one-year warranty.
For MG EV owners, the TopTekk TTB031 Power Battery Scanner is designed for the MG EV range and reads the same published categories of battery data through OBD2 via Bluetooth. It is not a conventional engine scanner or a 12V battery tester. As with any diagnostic product, exact vehicle compatibility should be checked before ordering. Neither tool turns a scan into a universal assessment of a car's condition, and neither replaces qualified advice where a safety concern exists.
Keep the buyer conversation honest
Share the record as supporting information, not as a sales guarantee. Explain when it was created and invite the buyer to review the original output, ask questions or arrange their own assessment. Avoid claims such as “perfect battery”, “certified health” or “no future faults”, even when the report appears reassuring. Those phrases go beyond what a diagnostic snapshot can establish.
The same principle applies when data raises a question. Record what you saw, do not invent a cause, and do not promise a repair result. Clear evidence, clear limitations and respect for an independent check are more useful to a serious buyer than an overconfident conclusion.
Frequently asked questions
Is one SOH reading enough to set the sale price?
No. SOH is one item of reported information. It should be presented with the scan date, vehicle condition and the limits of the report, not as a standalone valuation or guarantee.
Should I clear battery-related DTCs before showing the report?
Do not clear codes simply to make a report look better. Preserve the information and remember that a DTC is a clue, not a diagnosis or repair instruction.
Can a battery scanner certify my EV for a buyer?
No. A compatible scanner can provide data for discussion, but it does not certify a battery, guarantee future performance or replace an independent inspection or qualified technician.