ClearWatt

ClearWatt: independent battery certification for electric vehicles

ClearWatt is a British company that operates a technology platform focused on the state of health of electric vehicle batteries. Its proposition consists of turning real-world driving data and vehicle history into clear reports that serve as independent evidence for buying, selling or evaluating an electric car. The company presents itself as an intelligence layer for the electric vehicle and places its activity in the second-hand market, where uncertainty about the battery is one of the main barriers for buyers.

Battery health reports for buyers, sellers and owners

The platform organises its services into three different journeys depending on the user's objective:

• Buying an electric vehicle: it offers independent evidence on any car before committing to the purchase.
• Selling an electric vehicle: it provides battery evidence and reports aimed at dealers and fleets.
• Checking your own vehicle: it allows you to understand the state of health of the electric car you already drive.

The service is delivered through a mobile app. The user completes a series of drives with the vehicle and, based on the data collected directly from the car, the platform generates a health report. This report includes a classification of the battery's condition, range estimates according to the type of road (urban or motorway) and the season (winter or summer), range performance prediction, battery age, remaining warranty in miles and years, and the number of previous owners. It also includes a comparison with other vehicles of the same model, which helps contextualise whether the observed degradation falls within a normal range.

Data provided in the report

According to the platform's own information and the testimonials collected, the ClearWatt report covers the following specific aspects:

• Classification of the battery's state of health, with ratings such as A+.
• Range estimate differentiated by urban and motorway environments, and by winter or summer season.
• Range performance prediction.
• Battery age and remaining warranty expressed in miles and years.
• Number of previous owners of the vehicle.
• Comparison with other vehicles of the same model (benchmarking).
• Additional data about the vehicle, such as the location of the charging port.

The report is generated after completing several drives, a process the company describes as straightforward and requiring little effort from the user. The app guides the data collection and the final result is presented in a professional, easy-to-read document.

Target audience and practical applications

ClearWatt targets both individuals and industry professionals. Among individual users are buyers of second-hand electric vehicles looking to verify the battery's condition before purchasing a car, and sellers who want to demonstrate the real condition of their vehicle to give confidence to potential buyers. In the professional sphere, the company offers reports for dealers and fleets, with specific pricing for businesses.

The testimonials collected on the website mention use cases such as checking a 2021 Tesla Model 3, verifying the battery within the 14-day grace period after a purchase, or comparing several second-hand electric vehicles before deciding on one. The usefulness of the report for tracking battery degradation over time is also highlighted.

User ratings

The platform shows an average rating of 4.7 stars based on customer reviews. The comments highlight the usefulness of the report in reducing uncertainty in the buying and selling of second-hand electric vehicles, the clarity of the document, the support team's attentiveness and the possibility of obtaining independent proof of the battery's condition. Several users note that they are not aware of other similar services accessible to the general public outside motor industry specialists.

Additional tools and resources

In addition to the main reporting service, ClearWatt maintains a blog with content about the transition to electric vehicles and offers complementary tools on its platform. The company also has a business pricing section and an account area to manage contracted services.

Location and contact

County Hall Belvedere Road London, SE1 7PB