Check the battery.

Buying a used electric or plug-in hybrid? Read the state of health of its battery with an OBD2 Bluetooth reader, from the browser and without installing anything.

DemoMade-up data from an example car, not yours. Leave the demo

Not connected

Your carYear of first registrationKilometres (optional)

What this car reports

State of health (SoH)yes
Capacity compared with newno
Charge levelyes
Cell voltage (balance)yes
Battery temperatureyes
Rapid charges or cyclesno
Lifetime energy chargedno

The demo imitates the battery computer of the chosen model, with made-up data.

Is your car not on the list?

We only list cars whose battery data is documented in an open source we can cite. Rather than make up a figure, we prefer to tell you we do not know.

Tesla (Model 3, Model Y, Model S, Model X)It does not give battery data through the OBD socket without a special cable; look at the battery status on the car's screen (Service menu) or ask Tesla for the report.
Volkswagen ID.3, ID.4, e-Golf · Cupra Born · Škoda Enyaq · Audi Q4 e-tronThere is no open, checked table to read them through the OBD socket with a simple reader. Ask an official service for the battery certificate.
BMW i3 · MINI Cooper SEThe public definitions have a licence we cannot use in Testigo, and they need a reader mode that many cheap readers lack.
Peugeot e-208 / e-2008 · Opel Corsa-e / Mokka-e · Citroën ë-C4 · Fiat 500eThere is no open, checked source for their battery data yet. Ask a dealer for the maker's battery report.
MG4 · MG ZS EV · MG5They need security steps from the car that a normal OBD reader cannot do.
Hyundai Kona (2023 en adelante) · Kia Niro EV (2022 en adelante) · Ioniq 6They are new generations with no checked open data yet.

If your hybrid or electric car is not there, choose “Another hybrid, plug-in or electric”: we will try the standard value, which some cars give.

The car's data stays in your browser. It only leaves it if you share the report.

Want to read the engine fault codes? Go to Connect your car.

What you need

An OBD2 Bluetooth LE adapter

It costs about €15–25 in car parts shops or online. The box or the listing should say “Bluetooth LE”, “BLE” or “Bluetooth 4.0”. The ones that only say “Bluetooth” (the classic kind) or “Wi-Fi” won't work with the browser.

How to do the test

Ask the seller's permission before plugging anything into their car.
With the car parked, switch it on (READY showing) or turn the ignition on. Best while it is not charging.
Plug the reader into the OBD2 socket under the steering wheel and choose the model in the list.
Press “Check the battery” and choose the reader in the Bluetooth list.

The reading is more reliable with the battery between 30 and 80 % and at a mild temperature.

It only reads, it changes nothing

Testigo only asks the battery computer questions: it does not erase codes or change any car settings.

Works with Chrome or Edge, on Android and on computers. Not on iPhone or iPad.

Usual wear per year: Geotab, battery health study of more than 22,700 electric cars (January 2026).