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ClearWatt vs Altelium: Battery Test Comparison

Compare ClearWatt and Altelium EV battery solutions. OBD-based Battery Scorecard and passive testing vs Lloyd's-underwritten battery warranty for UK dealers.

ClearWatt vs Altelium — How Do They Compare?

ClearWatt and Altelium take very different approaches to the EV battery confidence challenge. ClearWatt now offers both an OBD-based Battery Scorecard (developed with the NFDA) and passive health monitoring during normal driving. Altelium combines health assessment with an insurance-backed battery warranty through the GardX EVerity programme.

Here is how they compare for dealers evaluating battery confidence solutions.

Side-by-Side Comparison

Feature	ClearWatt	Altelium
Test method	OBD-based Battery Scorecard + passive monitoring	Assessment + warranty programme
Certification	No third-party test certification	Lloyd's of London underwritten warranty
Accuracy	Not independently verified	Not publicly stated
Test time	Approximately 2 minutes (Battery Scorecard)	Varies by programme
Vehicle coverage	90%+ BEVs	Coverage tied to warranty eligibility
Cell-level analysis	No — A+ to D grading system	Not publicly detailed
Price point	£39.99/vehicle (consumer); dealer pricing available	Warranty pricing varies (1-3 year options)
Key partnerships	NFDA, Department for Transport	GardX (EVerity programme)
Output type	Unvalidated proprietary A+ to D grade	Warranty eligibility assessment
Unique advantage	Battery Scorecard (NFDA-developed), patent-pending ClearWatt Engine	Battery warranty as add-on product

What Each Provider Does Well

ClearWatt's Strengths

ClearWatt has expanded significantly with the launch of their OBD-based Battery Scorecard in December 2025, developed in partnership with the NFDA. This ~2-minute OBD test covers 90%+ of BEVs and gives ClearWatt a direct point-in-time testing product for dealers, alongside their original passive monitoring.

Partnerships with both the NFDA and Department for Transport provide strong institutional backing. Their patent-pending ClearWatt Engine powers the passive monitoring side, analysing 50+ indicators during normal driving with the consumer-friendly A+ to D grading system. Consumer pricing is £39.99/vehicle, with dealer pricing also available.

Altelium's Strengths

Altelium is unique in offering an insurance-backed battery warranty. The GardX EVerity programme makes this accessible through the dealer channel, with Lloyd's of London underwriting providing genuine financial security behind warranty claims.

Warranty options of 1 to 3 years give flexibility. The warranty is a sellable product — dealers can generate revenue from it, not just incur testing costs. For buyers hesitant about EV battery longevity, a warranty can close the sale.

Key Differences

Testing vs insurance: ClearWatt tests and reports on current battery health (via OBD Battery Scorecard or passive monitoring). Altelium insures against future battery failure. These address different anxieties — "is this battery healthy?" vs "what if this battery fails?"

Dealer fit: ClearWatt's Battery Scorecard now offers a ~2-minute OBD test that aligns with dealer workflows for certifying vehicles at intake. Altelium's warranty programme integrates into the F&I (finance and insurance) process that dealers already run. Both now fit dealer operations, but in different ways.

Market positioning: ClearWatt has moved into the dealer market through the NFDA partnership, adding to their consumer base. Altelium, through GardX, is built for the dealer channel. Both now serve dealers, though from different starting points.

Revenue opportunity: Altelium is a revenue product — dealers sell the warranty and earn margin. ClearWatt is a testing cost (£39.99 consumer; dealer pricing available). For the dealer business case, Altelium has a more straightforward ROI story, though ClearWatt's testing supports the evidence case for CRA compliance.

Output interpretation: ClearWatt's A+ to D grading system simplifies the output, but the grades are based on ClearWatt's own methodology — if challenged, the dealer cannot point to independent validation of what an 'A' or 'B' grade means. Altelium's warranty does not provide a diagnosis of battery condition at all.

What Neither Provider Offers

Both ClearWatt and Altelium have significant limitations for dealers who need certified point-of-sale evidence:

No TUV certification — Neither testing methodology is independently TUV-certified
No verified accuracy — Neither publishes validated accuracy data
No cell-level analysis — Neither provides individual cell condition heatmaps
No energy-based SoH — Neither uses energy-based State of Health methodology
No independently interpreted output — ClearWatt's grading methodology has not been independently validated. Altelium provides warranty eligibility, not an interpreted diagnosis of battery condition

For dealers who need independently certified evidence of battery condition at point of sale, Battery Health Check powered by AVILOO delivers the world's first dual TUV-certified test with +/-3% accuracy, cell-level heatmap analysis, and results in 3 minutes at £35 per test.

The Bottom Line

ClearWatt and Altelium serve different needs. ClearWatt now offers both point-in-time OBD testing (Battery Scorecard) and ongoing passive monitoring, serving both dealers and consumers. Altelium is strongest as a dealer-channel warranty product through GardX.

Neither, however, provides the independently TUV-certified point-of-sale evidence that UK dealers need for Consumer Rights Act compliance. For that requirement, the dual TUV-certified testing available through Battery Health Check is the market standard.

See How Battery Health Check Compares