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AVILOO vs ClearWatt: Battery Test Comparison
Compare AVILOO and ClearWatt EV battery health testing. Workshop-based TUV-certified testing vs passive driving analysis for UK car dealers.
AVILOO vs ClearWatt — How Do They Compare?
AVILOO and ClearWatt take fundamentally different approaches to battery health assessment. AVILOO provides an instant, workshop-based test with TUV-certified results. ClearWatt uses passive testing during normal driving to build a picture of battery health over time.
These are not interchangeable products — they serve different use cases. 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 | Passive testing during normal driving |
| Certification | TUV Nord + TUV Sud certified | No independent certification |
| Accuracy | +/-3% | Not publicly stated |
| Test time | 3 minutes (FLASH test) | Requires driving period |
| Vehicle coverage | 95%+ of EVs and PHEVs | Growing coverage |
| Cell-level analysis | Yes — individual cell heatmap | No — grading system (A+ to D) |
| Price point | ~£35 per test | Consumer app model |
| Key partnerships | BCA, Cox Automotive, ADAC, Mercedes-Benz, Hyundai | Department for Transport backed |
| Unique advantage | Only TUV-certified test worldwide | Patent-pending ClearWatt Engine, 50+ indicators |
What ClearWatt Does Well
ClearWatt has carved out a distinctive position as a consumer-first platform. Their A+ to D grading system is intuitive and easy for non-technical buyers to understand. The Department for Transport backing lends credibility to their research programme.
Their passive testing approach — analysing battery health during normal driving — means no workshop visit is required. The patent-pending ClearWatt Engine analyses 50+ indicators, building a comprehensive health profile over time.
For consumers buying privately, ClearWatt offers a way to assess a vehicle without requiring the seller to visit a dealer or testing centre. This is a genuine gap in the market that ClearWatt addresses.
Where AVILOO Leads
Instant Results for Dealers
The dealer use case is fundamentally different from the consumer use case. Dealers need to certify vehicles as they arrive on the forecourt — not after days of driving. The AVILOO FLASH test delivers a complete certificate in 3 minutes on a stationary vehicle. ClearWatt's passive approach requires a driving period, which does not fit the dealer workflow of certifying stock at intake.
TUV Certification
AVILOO is the only 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 TUV-certified certificate provides materially stronger legal protection 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.
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 Tools for Different Jobs
It is worth noting that ClearWatt and AVILOO are not always direct competitors. ClearWatt's consumer-focused, passive approach suits private buyers and long-term vehicle monitoring. AVILOO's instant, workshop-based approach suits the dealer environment where speed, legal defensibility, and diagnostic depth are priorities.
For dealers, the choice is clear: you need a test that delivers certified results at the point of intake, not after a driving period.
Ready to See the Difference?
Book a demo and run your first TUV-certified battery health test.
See also: The Certificate | How It Works | All Providers Compared