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AVILOO vs ClearWatt: Battery Test Comparison
Compare AVILOO and ClearWatt EV battery health testing. TUV-certified cell-level testing vs OBD-based Battery Scorecard and passive analysis for UK car dealers.
AVILOO vs ClearWatt — How Do They Compare?
AVILOO and ClearWatt both offer battery health testing for the dealer market, though they take different approaches. AVILOO provides TUV-certified, cell-level analysis through dedicated hardware. ClearWatt offers both an OBD-based Battery Scorecard for point-of-sale testing and passive analysis during normal driving.
Here is how they compare for dealers.
Side-by-Side Comparison
| Feature | AVILOO (Battery Health Check) | ClearWatt |
|---|---|---|
| Test method | Dedicated AVILOO Box via OBD-2, stationary | OBD-based Battery Scorecard + passive driving analysis |
| Certification | TUV Nord + TUV Sud certified | No third-party test certification |
| Accuracy | ±3% (independently verified via TÜV) | No independent verification published |
| Test time | 3 minutes (FLASH test) | ~2 minutes (Battery Scorecard) or driving period (passive) |
| Vehicle coverage | 95%+ of EVs and PHEVs | 90%+ BEVs (Battery Scorecard) |
| Cell-level analysis | Yes — individual cell heatmap | No — grading system (A+ to D) |
| Price point | ~£35 per test | £39.99/vehicle (consumer); dealer pricing available |
| Key partnerships | BCA, Cox Automotive, ADAC, Mercedes-Benz, Hyundai | NFDA, Department for Transport |
| Output type | TUV-certified interpreted certificate (SoH %, cell severity ratings) | Unvalidated proprietary A+ to D grade |
| Unique advantage | World's first dual TÜV-certified test | Patent-pending ClearWatt Engine, 50+ indicators, combined active + passive testing |
What ClearWatt Does Well
ClearWatt has built a credible position in the UK market with both government and industry backing. Their December 2025 launch of the Battery Scorecard — developed in partnership with the NFDA and aligned with the Electric Vehicle Approved (EVA) scheme — added a dealer-focused OBD testing product to their existing passive monitoring capability.
The Battery Scorecard evaluates cell voltages, thermal systems, pack chemistry, charging patterns, and warranty indicators via OBD in approximately 2 minutes, covering 90%+ of BEV models. Their A+ to D grading system is intuitive and easy for non-technical buyers to understand.
ClearWatt's unique strength is combining point-of-sale OBD testing with ongoing passive monitoring during normal driving. The patent-pending ClearWatt Engine analyses 50+ indicators. For consumers buying privately, the passive mode means no workshop visit is required — a genuine gap in the market. The Department for Transport backing and NFDA partnership lend credibility to their approach.
Where AVILOO Leads
TÜV-Certified Output
Both providers now offer rapid point-of-sale testing. The key differentiator is what you get at the end. The AVILOO FLASH test delivers a TÜV-certified certificate in 3 minutes — an independently verified document with established evidential weight. ClearWatt's Battery Scorecard delivers results in a similar timeframe, but without independent third-party certification of the testing methodology.
Dual TÜV Certification
AVILOO is the world's first provider with dual TUV certification (TUV Nord and TUV Sud). This independent certification means the methodology has been audited and validated to meet rigorous engineering standards. Under the Consumer Rights Act 2015, a TÜV-certified certificate provides stronger evidential weight than an uncertified health grade.
Cell-Level Diagnostics
AVILOO analyses every individual cell in the battery pack, producing a visual heatmap with severity indicators. ClearWatt uses an A+ to D grading system that communicates overall health but does not provide cell-level diagnostic detail. For dealers who need to understand exactly what they are selling — and defend that understanding if challenged — cell-level data is essential.
Interpreted Results vs Raw Data
ClearWatt's A+ to D grade simplifies the output, but the grading methodology is not independently certified. The criteria behind each grade are ClearWatt's own — if challenged in a dispute, the question becomes who validated that an 'A' grade means what ClearWatt says it means.
AVILOO's certificate delivers an interpreted State of Health calculated by algorithms independently validated by TUV. The difference is not just presentation — it is whether the interpretation behind the result has been independently certified. For dealers, this determines whether your evidence stands on its own authority or on yours.
Verified Accuracy
AVILOO publishes a verified +/-3% accuracy figure, independently validated through TUV certification. This level of precision gives dealers and buyers confidence in the specific State of Health percentage reported on the certificate.
Enterprise Scale
With 550,000+ tests globally, 750+ clients in 30+ countries, and named enterprise partners including BCA, Cox Automotive, and Mercedes-Benz, AVILOO operates at a scale that validates the technology across thousands of vehicle models and conditions. The EUR 30 million Armira Growth investment provides long-term platform stability.
Different Strengths
ClearWatt and AVILOO now both serve the dealer market with rapid point-of-sale testing. ClearWatt's additional strength is combining this with passive ongoing monitoring and their NFDA partnership. AVILOO's core advantage is independent TÜV certification, cell-level diagnostic depth, and proven global enterprise scale.
For dealers who prioritise legally defensible, independently certified results with cell-level analysis, AVILOO through Battery Health Check remains the stronger choice. For dealers who value the combined active + passive approach and NFDA alignment, ClearWatt is a credible alternative worth evaluating.
Ready to See the Difference?
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See also: The Certificate | How It Works | All Providers Compared