AVILOO vs ClearWatt: Battery Test Comparison

AVILOO vs ClearWatt

AVILOO is the world's first independent, TÜV-certified battery diagnostic system for electric vehicles¹, used by 750+ clients across 30+ countries, with 550,000+ tests to date². AVILOO's FLASH Test is also CARA Approved³.

ClearWatt is a UK-based EV data company offering both a passive consumer health test and a dealer-facing Battery Scorecard launched in December 2025 in partnership with the National Franchised Dealers Association (NFDA)⁴. ClearWatt explicitly positions itself as going "beyond simple state of health (SoH) values taken from the vehicle's battery management system"⁵.

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At a glance

	AVILOO	ClearWatt
Type of credential	TÜV-certified engineering certification of the testing methodology1; on CARA Europe's approved providers list3	NFDA-aligned (EVA scheme); not on the CARA approved providers list3; not TÜV-certified
SoH calculation	Independently calculated by AVILOO from raw cell-level data6	OBD data + ClearWatt's "further proprietary data"; positions itself as going "beyond" BMS-reported SoH5
SoH methodology	Energy-based, GTR22-aligned, WLTP-aligned7	A+ to D grading system on the dealer Battery Scorecard4
Reported scale	550,000+ cumulative tests; over 750 clients across more than 30 countries (Feb 2026)2	UK-focused; growing dealer base via NFDA channel4
Major customers	Mercedes-Benz, Hyundai, Cox Automotive, BCA, ADAC, Emil Frey, Pickles Australia, Arval8	NFDA member dealers via the EVA scheme4
Cell-level heatmap with severity indicators	Yes — since June 20256	As of 5 May 2026, no cell-level heatmap is described in ClearWatt's public materials
Geographic scope	Europe, Asia, Australia, USA8	UK9
Test time (dealer)	3 minutes — independent analysis10	"A couple of minutes" — Battery Scorecard report5
Pricing	£35 per test (dealer)	£39.99 per consumer test11; dealer pricing on request

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Two different product structures

ClearWatt and AVILOO are organised differently.

AVILOO is a single battery-diagnostic platform with one test methodology, available in two formats: the FLASH Test (3 minutes, dealer-facing) and the PREMIUM Test (full discharge cycle, consumer-facing). Both are TÜV-certified¹; the FLASH is also CARA Approved³.

ClearWatt has three product lines⁹:

1. Copilot — passive, hardware-free, consumer-facing battery health monitoring
2. EV Flash Reports — dealer-facing, OBD hardware-based, with the Battery Scorecard sitting within this framework
3. EV Check Plus — market-wide intelligence + vehicle history

For UK dealers, the relevant ClearWatt product is the OBD-based Battery Scorecard launched December 2025, developed with the NFDA and aligned with their EVA scheme⁴.

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Certification and credentials

AVILOO holds TÜV certification of its testing methodology¹, with TÜV SÜD as a long-standing partner since April 2022¹² and TÜV NORD also a partner¹³. AVILOO is also on CARA Europe's approved providers list (AVILOO Flash Test)³.

ClearWatt has different kinds of recognition. The Battery Scorecard was developed in partnership with the National Franchised Dealers Association (NFDA), aligning with the NFDA's EV Approved (EVA) scheme⁴. The NFDA is a UK trade association of franchised motor retailers; the EVA scheme is a guideline framework, not an engineering certification of the testing methodology. ClearWatt does not appear on CARA Europe's approved providers list³ and does not hold TÜV certification.

These are different categories of credential. Trade-association alignment supports adoption; independent engineering certification (TÜV) is a separate, methodology-level credential.

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Cell-level analysis

AVILOO has shipped a cell-level heatmap with severity indicators on every certificate since June 2025⁶. The heatmap displays each individual cell's condition, highlighting any anomalies with severity ratings, designed for non-specialists to interpret at a glance.

ClearWatt publishes the dealer Battery Scorecard as an A+ to D grade⁴. As of 5 May 2026, we have not located a published description of a cell-level heatmap or per-cell severity ratings in ClearWatt's public materials. The dealer report focuses on a summary grade plus "fault detection beyond basic OEM values"⁹.

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The bottom line

If a buyer's solicitor under the Consumer Rights Act 2015 challenges the SoH figure on the certificate, the dealer needs an answer to one question: what evidence backs that figure?

• AVILOO's certificate carries an independently calculated SoH with cell-level severity heatmap, backed by TÜV certification of the methodology and CARA Approval of the diagnostic system, drawn from a global dataset of 550,000+ tests across 30+ countries.
• ClearWatt's Battery Scorecard delivers an A+ to D grade developed with the NFDA, aligned with the EVA scheme. The grading methodology has not been independently certified by TÜV or CARA Europe.

ClearWatt's broader EV-data offering — Copilot, market intelligence, ongoing monitoring — is a different kind of product and may suit dealers wanting an integrated EV-data partner. Battery Health Check chose AVILOO because, on the specific question of what evidence sits behind the SoH on the certificate, AVILOO is the system that produces an independent answer.

Get started with Battery Health Check

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Sources

This page reflects publicly available materials reviewed and captured on 5 May 2026.

1. AVILOO official flyer (PDF) — primary AVILOO marketing.
2. Battery diagnostics specialist Aviloo secures €30 million — electrive.com, 11 February 2026.
3. CARA Europe approved providers list — AVILOO Flash Test on the list; ClearWatt not listed.
4. ClearWatt launches Battery Scorecard to support used EV sales — GreenFleet, 5 December 2025.
5. ClearWatt launches new Battery Scorecard for used EV assessment — AM Online, December 2025.
6. AVILOO launches next-gen battery certificate — electrive.com, 12 June 2025.
7. AVILOO Whitepaper: Health State of the Battery (SoH) — AVILOO whitepaper on energy-based SoH.
8. AVILOO secures €30 million strategic investment — Batteries News, February 2026.
9. ClearWatt approach — ClearWatt's product overview.
10. AVILOO FLASH Test product page — AVILOO's own product specification.
11. ClearWatt EV Health Test — ClearWatt's consumer test page.
12. AVILOO: Battery test for professionals — TÜV SÜD's own newsletter, April 2022.
13. AVILOO homepage — partner logo grid.

See also: How It Works | The Certificate | All Providers Compared