How Aviloo Battery Diagnostics Are Restoring Trust in the Used EV Market

If you're shopping for a used EV, that nagging battery question follows every test drive. How much capacity has this thing actually lost in three years? You don't need to be a gearhead to wonder. Austrian diagnostics outfit AVILOO, founded in 2018 and profiled by Forbes in a deep dive with CEO Marcus Berger, has turned that worry into a number you can take to the bank — and they're now backing it with a financial guarantee.

What the PREMIUM and FLASH tests actually do

The PREMIUM test is the consumer version, and it's a real commitment: install a small OBD-II dongle (look, YouTube walked me through it), charge to 100%, then drive down to roughly 10% within seven days. Real errands, not a lab run. The output is a battery health certificate stating your state of health, which AVILOO now backs with a financial guarantee. The FLASH test is the dealership version — much faster, meant for dealers who can't ask a buyer to wait a week.

The cleverness underneath is just data: thousands of voltage, current and temperature readings pulled through the OBD-II port every millisecond, cross-referenced against AVILOO's growing database of every EV model on the road. There is no standardized battery protocol, which is exactly why a third party had to build this in the first place. As Berger told Forbes: "We built AVILOO because the used EV market had a structural trust problem" — and that data infrastructure is what makes the certificate worth more than a handshake.

The real-world sanity check

The Forbes piece walks through testing a six-year-old Tesla on the PREMIUM protocol and landing at 92% of original capacity. That's the number most used EV shoppers are quietly hoping for when they look at a three-to-six-year-old car: not pristine, but plenty of buffer. A standardized certificate means sellers can list with proof, and buyers can walk onto a lot asking for one rather than taking a salesperson's word for it. AVILOO says the UK remarketing market has responded exactly that way — faster turnover, firmer prices, less haggling over phantom battery risk.

The same trust gap is showing up elsewhere. Indian startup TrusTerra, founded in 2024 in Delhi NCR, has built a "credit score" for EVs called TruEV Score, plus a 24-hour cash-buyout service (TerraCash) and a dealer auction platform for certified inventory (TerraBid). They say they've onboarded 150-plus dealers, evaluated more than 2,000 used EVs, and closed roughly $1M in pre-seed funding in October 2025 to expand beyond Delhi NCR.

Two very different companies, on two continents, chasing the same deficit. That's not a coincidence — it's the used EV market admitting out loud that mileage and service history aren't enough anymore.

What I'd do this week

Ask for a third-party battery health certificate before you sign anything. If a dealer can't produce one, that's a signal in itself. Whether you're sizing up a three-year-old EV on a lot or just trying to time your next move, the principle holds: the right signals beat vibes every time. I'm not going back to handshake deals and hope.