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How to Compare EV Battery Health Checks
Not every EV battery check measures the battery. Some report the figure the car has already calculated about itself. Here is what separates a readout from an independent, TÜV Certified test.
Not every battery check is the same thing
"EV battery check" covers two quite different things. Some tools plug into the diagnostic port and report the State of Health figure the vehicle's own battery management system has already worked out. Others measure the battery independently and issue a certificate from a third party.
That difference decides how much the certificate is actually worth to you, to your buyer, and in a dispute.
A battery readout is not a battery test sets out the difference in full: where each figure comes from, what a pack-level average hides, why the newest EVs will not talk to a basic readout at all, and what an independently measured certificate gives you that a self-reported number does not.
Five things to check, whoever you use
Whatever provider you choose, a certificate worth relying on should be:
- Independent of the car's own BMS figure.
- Certified by a recognised body. Ours is TÜV Certified.
- Cell level, not a single headline percentage.
- Able to reach the newest EVs, which means DoIP capable.
- Verifiable by the buyer, for example with a QR code, and backed by a warranty on the result.
If a provider cannot answer all five, ask what the number on the certificate is actually based on.
Why the answer matters commercially
Under the Consumer Rights Act 2015, dealers face a reversed burden of proof for the first six months after sale. If a battery fault emerges, you need to demonstrate the vehicle was of satisfactory quality at the point of sale. How strong that demonstration is depends on what kind of evidence sits behind the figure on the certificate.
The average EV battery dispute costs £6,193 (Motor Ombudsman, Q4 2025). A battery replacement runs £12,000 to £25,000+. The right test does not just build buyer trust, it protects your business.
Read next
- A battery readout is not a battery test: the full comparison of the two approaches.
- Why an independent battery check matters: the same argument for private buyers and sellers.
- What is on the certificate: a real AVILOO certificate, explained.
Battery Health Check is an independent provider of EV battery diagnostic services using AVILOO technology. This comparison has been prepared by Battery Health Check and is not an official AVILOO corporate publication.
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