TÜV NORD battery check in the electric used car inspection
The high-voltage battery is the most expensive and most important component of an electric vehicle. It determines range, residual value and lifespan. That's exactly why the TÜV NORD battery check is at the heart of the electric used car inspection.
You don't just get an estimate – you get a CARA-certified measurement of the state of health (SoH), including an official TÜV NORD battery inspection report.
Why the battery condition determines the value of a used EV
A high-voltage battery ages even when the vehicle looks flawless. Lost capacity isn't visible from the outside – it only becomes apparent through a technical measurement of the battery via the diagnostic interface.
The range display in the vehicle is not a reliable indicator. It shows an estimate based on the most recent driving profile, not the actual health of the battery.
Age and mileage on their own don't tell you much either: vehicles with identical histories can have batteries that have aged very differently, depending on charging and usage behavior.
That's exactly why buying a used electric car requires an objective measurement – and that's precisely what the TÜV NORD battery check delivers.
What the TÜV NORD battery check actually delivers
The TÜV NORD battery check is a standardized verification of the high-voltage battery's health, certified under the CARA procedure – not an estimate, but based on real-time diagnostic data from the control units.
State of health (SoH) in percent
The key metric: how much capacity does the battery have today compared to its original condition? You receive a clear, comparable value as a percentage.
Remaining capacity
A concrete statement about the battery's remaining capacity – the basis for any realistic range assessment.
Degree of degradation
How far has the battery aged compared to its delivery condition? This makes it easier to assess the expected wear going forward.
Official TÜV NORD battery inspection report
We document the result in an official battery inspection report from TÜV NORD – a recognized certificate that builds trust when buying and reselling.
This gives you more than just a gut feeling about the battery – you get a transparent technical foundation for your purchase decision.
How the battery check works technically
The TÜV NORD battery check is part of the TÜV NORD Onboard Car Diagnosis – a plug-and-play diagnostic system that is connected on site to the vehicle's diagnostic interface.
Real-time diagnostic data from the high-voltage battery is read out via the control units and evaluated using a standardized procedure certified by CARA.
As a result, you get:
You can learn more about the methodology of the TÜV NORD Onboard Car Diagnosis on the TÜV NORD vehicle diagnosis page.
What the battery certificate actually does for you
When buying
You can tell whether the asking price matches the actual battery condition. A documented SoH value can decisively strengthen your negotiating position – or save you from an expensive bad purchase.
When reselling
An official TÜV NORD battery certificate documents the battery's health objectively. That builds trust with the buyer and can have a positive effect on the resale value.
This makes the battery check more than a one-off inspection – it's an investment that can pay off over the entire time you own the vehicle.
When the TÜV NORD battery check is especially useful
You can read more about why an inspection before buying is so important for EVs on the page Have an electric car inspected before buying.
The battery check in the overall electric used car inspection
The battery check is the centerpiece, but not the only part of the electric inspection.
In addition to the battery measurement, a certified automotive master technician inspects the vehicle the classic way: body, interior, charging port, fault codes, onboard charger, software version and – where possible – driving behavior on a test drive.
Only the combination of an objective battery measurement and an expert on-site assessment gives you the complete picture of the vehicle.
You'll find the complete service on the main page for the electric used car inspection.
More topics around the electric used car inspection
Frequently asked questions about the TÜV NORD battery check
The TÜV NORD battery check is a standardized test of the high-voltage battery, certified under the CARA procedure. It determines the state of health (SoH) – the battery's health expressed as a percentage – based on real-time diagnostic data from the control units.
The state of health is a percentage value indicating how much capacity the high-voltage battery still has today compared to when it was new. 100 percent corresponds to the delivery condition. An SoH of 90 percent means the battery still delivers 90 percent of its original capacity.
The range display in the vehicle is an estimate based on the most recent driving profile and depends heavily on temperature and driving style. The TÜV NORD battery check, by contrast, measures the battery's actual remaining capacity via the diagnostic interface – objectively and independently of driving style.
The TÜV NORD battery check is carried out as part of the electric used car inspection. In total, the on-site inspection including the battery measurement usually takes around 60 to 90 minutes.
Yes. You receive an official TÜV NORD battery inspection report with the SoH value, remaining capacity and an assessment – a recognized certificate that builds trust when buying and when reselling later.
The battery check works with the vast majority of common electric cars and plug-in hybrids, as the TÜV NORD Onboard Car Diagnosis is broadly compatible. For very new or rare models, we clarify availability in advance during booking.
Yes. An active warranty is no substitute for measuring the current condition. Warranties usually only kick in from a defined capacity loss, which is often well beyond what is noticeable in everyday use. The battery check shows you the actual condition today.
Understand the battery condition – instead of guessing
Have the EV you want inspected with the TÜV NORD battery check and get the state of health value in black and white.