EV Battery Certification
We carry out an independent assessment of the traction battery's state of health (SoH) in electric (BEV) and plug-in hybrid (PHEV) cars and issue a battery condition certificate to the CARA Approved® standard.
“We don't just read what the car reports - we can verify it and repair it.”
Independent assessor
Certificate to the CARA Approved® standard
We issue the certificate using an industry-accredited method bearing the CARA Approved® mark - a recognised, independent standard for assessing traction-battery condition. This guarantees the result is not our subjective opinion but a repeatable measurement following an independent assessor's methodology.
- Independent, industry method - CARA Approved® mark
- Repeatable, objective result - not a workshop's opinion
- Document recognised in sales, import and remarketing
What is CARA Approved®?
CARA (Car Remarketing Association) is the international industry body for vehicle remarketing - it brings together fleet, leasing and professional used-car trading companies. The CARA Approved® mark is granted only to EV battery test methods that have passed independent verification for repeatability and measurement reliability. Our certificate is issued using exactly such a method.
Why do we have it?
The EV market needs an objective language for describing battery condition - a "workshop opinion" is not enough when selling, importing or settling a lease. That is why we invested in a test method bearing the CARA Approved® mark: our measurement result follows the standard used by the professional vehicle trade across Europe.
Why is it worth it?
Selling? The certificate ends the "worn-out battery" debate, backs up your price and speeds up the sale. Buying? You get a verified SoH measurement instead of the seller's assurances - and a solid negotiating argument. The PDF document with a QR code can be verified online at any time.
We work on two levels
From a fast certificate to real measurement and repair
Level 1
Condition certificate (fast)
SoH measurement based on data from the battery management system (BMS) via the OBD port, using the accredited CARA Approved® method. A result in minutes and a report ready on the spot - ideal when selling or buying a car.
- Result in a few minutes
- PDF report + online version with QR code
- Accredited method - CARA Approved®
Level 2
Independent and corrective diagnostics
Measurement at module and cell level, load analysis and diagnostics of the entire high-voltage (HV) system. When a Level 1 certificate shows an anomaly, we verify it with a real measurement and can repair it - module regeneration or replacement.
- Module and cell measurement under load
- HV system diagnostics (EVDiag, Benning meters)
- SEP G1 (E/D) qualifications and Bosch HV certificate
How we do it
The process step by step
Vehicle identification
VIN read-out and matching to the model database - we determine the pack type and reference point.
SoH measurement
OBD connection and read-out of battery parameters from the BMS using the accredited CARA Approved® method.
Analysis
SoH in %, real capacity, module/cell voltages and balance, temperature, deviation detection and comparison to the model benchmark.
Certificate
A PDF report plus an online version with a QR verification code to confirm authenticity.
In-depth diagnostics / repair (optional)
When the result needs verification or intervention - module- and cell-level measurement, repair or replacement.
What the certificate includes
Substance, not marketing
- Vehicle data - make, model, VIN, year, mileage, type (BEV/PHEV)
- SoH indicator (%) - battery state of health
- Real available capacity (kWh) and estimated real range
- Module/cell balance and condition - voltages and deviations
- Pack temperature and status
- Comparison to typical condition for the model, age and mileage (benchmark)
- Test date, measurement method and assessor ID
- QR verification code - check authenticity online
Pricing
Simple, clear pricing
Battery condition certificate (SoH)
PLN 400
Certificate to the CARA Approved® standard - PDF report and online version with QR code. Price per vehicle (BEV/PHEV). In-depth diagnostics and repair - individual quote.
Order a battery testOn-site service
Visit our workshop in Katowice - full diagnostic facilities and the option to repair on the spot.
Mobile service
We come to the dealership, used-car lot or customer - battery testing on location, ideal for several cars at once.
Who it's for
Who benefits from a battery certificate
Used-car lots & EV/PHEV dealers
A certificate as a sales tool - greater buyer trust and less haggling over the “unknown” that is the battery.
EV importers
A certificate as a standard attached to the imported car - a differentiator versus offers without battery verification.
Buyers - pre-purchase (PPI)
An independent assessment of the car you want to buy. Don't buy a used EV blind.
EV/PHEV owners
Battery health checks, verification before the warranty ends and peace of mind about the car's most expensive part.
Leasing, fleets, remarketing
SoH assessment on returns and resale - managing the vehicle's residual value.
Appraisers & insurers
A technical document for valuations, claims and disputes over battery condition.
Benefits
Value for both sides of the deal
For the seller
- A car with a certificate sells faster and inspires greater trust.
- An objective argument in price negotiations - the battery stops being an “unknown”.
- Your listing stands out against cars with no verification.
For the buyer
- Certainty about the car's most expensive part (the battery is often 30-40% of an EV's value).
- An independent assessment - you don't rely solely on the seller's word or the car's raw read-out.
- Protection against a costly buying mistake.
Method & credibility
Independence backed by a standard, equipment and qualifications
SoH is valid as of the measurement date - the battery is a wear item, and the certificate reflects its condition on the day of testing and is not a guarantee for the future. A Level 1 certificate is based on the vehicle's BMS data using the accredited CARA Approved® method; a full independent measurement under load is Level 2.
Dealers & importers
Certify your EVs - sell faster and build buyer trust. Ask about an ongoing B2B partnership and a mobile offer.
Ask about a partnershipBuying or own an EV?
Check the battery before buying or inspect your own car. Book an SoH test - on-site or mobile.
Message us on WhatsAppFrequently Asked Questions
How does the fast certificate differ from in-depth diagnostics?
The condition certificate (Level 1) is based on BMS data read via OBD using the accredited CARA Approved® method - the result is ready on the spot. Independent diagnostics (Level 2) means module- and cell-level measurement, load analysis and testing of the entire high-voltage system. Level 1 is a fast assessment; full independence is Level 2.
How much does the certificate cost and what's included?
The battery condition certificate (SoH) to the CARA Approved® standard costs PLN 400 per vehicle - you receive a PDF report and an online version with a QR code. In-depth diagnostics (Level 2) and any repair are quoted individually.
Is the test on-site or mobile?
Both. You can visit our workshop in Katowice or order the mobile service - we come to the dealership, used-car lot or customer, which works especially well for several cars at once.
Is the certificate valid indefinitely?
No. The battery is a wear item, so the certificate reflects its condition on the measurement date and is not a guarantee of future condition. When selling a car, it's best to keep the test as recent as possible.
What if the measurement detects an anomaly?
Then Level 2 steps in - we verify the read-out with a real module- and cell-level measurement, locate the problem and, where justified, repair it (module regeneration or replacement). We don't just read what the car reports - we can verify it and repair it.
Which vehicles do you test?
Fully electric cars (BEV) and plug-in hybrids (PHEV) - including Tesla, BMW i, Audi, Volkswagen, Mercedes EQ and others. We confirm exact model coverage when booking.
Other EV services
EV and hybrid service
Periodic servicing, battery and HV system diagnostics, heat pump air conditioning, charging system repairs. HV battery diagnostics - 500 zł.
See detailsTraction battery repair
Replacement of only the faulty modules instead of the whole battery - from 3 500 zł. Cell-level diagnostics, measurement report before and after.
See detailsPre-purchase EV inspection
Independent battery SOH measurement, charging test and report with recommendation - from 600 zł, we travel to the car.
See details
Ready for more power?
Contact us - we'll quote your project within 24h.