How to Read an EV Battery Health Report

Check the report’s identity and timing

Match the vehicle details and odometer reading with the car and supporting documents. Note the date and ask whether the battery, software or charging behaviour has changed since the test. A report for a previously installed pack is not current evidence. EVVerity does not ask you to upload a VIN; these identity checks happen between you, the seller and the inspector.

Find the measurement method

Look for a description of how the figure was obtained. A BMS-reported estimate, a controlled energy test and a range-based inference are different methods. Ask what the test includes, which SoC window it covers and how results are normalised. A detailed-looking layout or a logo does not replace a documented procedure.

Read the supporting observations

Where the report provides additional measurements, ask the provider to explain the applicable limits and test conditions. Do not diagnose a pack from an isolated cell-voltage number without that context. Check whether fault codes, thermal conditions and test interruptions were recorded, and whether the conclusion refers only to capacity or to a broader inspection.

Deal with disagreements openly

Compare the report with your capacity estimate without averaging them into a supposedly more accurate number. Different conditions or baselines may explain the gap. Ask the testing organisation for clarification and consider a repeat or independent inspection when the difference remains material. Keep the original report with its caveats; a transcribed SoH value loses much of the evidence that makes it meaningful.

Read the report in this order

A report should let another reader understand what was done and what the result means. If an essential field is absent, ask the provider to explain it rather than assuming a favourable answer.

Keep the original wording

If a report says “BMS-reported capacity estimate,” do not shorten it to “certified battery capacity” in your notes. Likewise, “no fault code recorded during this test” is narrower than “the battery has never had a fault.” Ask how the provider treats an incomplete test and whether the result has any method-specific uncertainty. When comparing two reports, write each method beside the percentage. If they disagree, the right next step may be clarification or a repeat test under comparable conditions. EVVerity can organise the values but cannot validate a PDF, certify the tester or interpret an isolated cell measurement as a diagnosis.

Before you rely on the answer

• Was the test completed normally?
• Can the provider explain the method in writing?
• What does the conclusion explicitly exclude?

Worksheets and numerical scenarios are original EVVerity editorial examples. They are not observed vehicle results or market-price data.