Independent Tesla Battery Health Testing for Used EVs
Managix provides independent battery health testing for used Tesla EVs, giving buyers, sellers, and dealers a verified state of health (SOH) report they can trust. Unlike the estimated range shown on a Tesla's own dashboard, our test measures actual battery performance and produces a shareable Managix Battery Health Certificate before you buy or sell.
Independent diagnostics for every used Tesla model.
Why test the battery before buying or selling a used Tesla?
A Managix independent battery health test matters when buying or selling a used Tesla because the range figure on the dashboard is an estimate, not a direct measurement, and it can be influenced by recent driving conditions, temperature, and charging history. A proper test isolates the battery's actual condition from those short term variables.
The problem with relying on the in-car battery display
The estimated range shown on a Tesla's touchscreen is calculated from recent driving data and can shift day to day. It is not a certified measurement of the battery's state of health, and it cannot be independently verified by a buyer, seller, or third party. It is simply the car reporting on itself.
What a degraded battery can cost you
- Reduced real world driving range compared to the original advertised figure
- Lower resale value if degradation is discovered after purchase
- Potential disputes between buyer and seller with no independent evidence to resolve them
- Unexpected battery replacement or repair costs once outside Tesla's warranty period
What does a Tesla battery health test include?
A Managix Tesla battery health test includes a State of Health (SOH) measurement, cell balance and voltage analysis, a check of charging curve and fast charge performance, and a comparison of current tested range against the original rating. Every test concludes with a written report and a Managix Battery Health Certificate in plain language.
State of Health (SOH) measurement
We measure the battery's current usable capacity against its original factory capacity, expressed as a percentage.
Cell balance and voltage analysis
We check individual cell groups for voltage imbalance, which can indicate uneven wear or early stage battery issues not visible from range alone.
Charging curve and fast charge performance
We assess how the battery accepts charge across the charging curve, since a healthy battery should charge in line with its original specification.
Range degradation versus original rating
We compare the vehicle's current tested range against its original EPA or WLTP rated range for that specific model and battery configuration.
Full diagnostic report with certificate
Every test concludes with a written report and a Managix Battery Health Certificate summarising the result in plain language.
How does Tesla battery health certification work?
Managix certifies a used Tesla's battery in five steps: you book online through the Managix certification form, a diagnostic scan is performed on-site through our mobile testing service, the data is analysed against Tesla's published battery benchmarks, a certificate is issued digitally, and you use it to support a faster sale or more confident purchase.
- 1
Book your test online via the Managix certification form.
- 2
Vehicle diagnostic scan performed on-site through our mobile testing service.
- 3
Data analysis against Tesla's published battery benchmarks and known degradation patterns for the model and age of your vehicle.
- 4
Certificate issued delivered digitally, ready to share with a buyer, seller, or dealer.
- 5
Use your certificate to support a faster sale or a more confident purchase.
Which Tesla models does Managix test?
Managix tests every used Tesla model: the Model 3 in both Standard Range and Long Range variants, all Model Y battery configurations sold in Australia, and the larger battery packs fitted to the Model S and Model X, including older pre-refresh variants. Each test ends with a Managix Battery Health Certificate.
Model 3 battery health testing
Independent SOH and charging performance testing for both Standard Range and Long Range Model 3 variants.
Model Y battery health testing
Full diagnostic testing covering all Model Y battery configurations sold in Australia.
Model S and Model X testing
Testing for the larger battery packs fitted to Model S and Model X, including older pre-refresh variants.
What is a good battery health score for a used Tesla?
A used Tesla's battery is considered to be in good health when the capacity retention measured in a Managix battery health test sits above Tesla's own warranty threshold and is broadly consistent with its age and kilometres travelled. Tesla's battery and drive unit warranty is structured around a capacity retention threshold, commonly cited at around 70%, over the warranty period.
| Approximate age / distance | Typical degradation range |
|---|---|
| 0 to 50,000 km | 0 to 5% |
| 50,000 to 100,000 km | 5 to 10% |
| 100,000 to 150,000 km | 8 to 15% |
| 150,000 km+ | 10 to 20%+ (varies by model and battery chemistry) |
Figures are general guidance ranges based on publicly reported Tesla battery degradation data and Tesla's own warranty terms. Individual results vary by vehicle, climate, and charging habits. An independent test gives you the actual figure for your specific vehicle.
What do people ask about Tesla battery health tests?
Here are answers to common questions about the Managix independent Tesla battery health test, including what it costs, how long it takes, using the certificate when you list your Tesla for sale, testing at your location, acceptance by dealers and finance companies, and how it differs from Tesla's own battery data.
How much does a Tesla battery health test cost?
Managix's independent Tesla battery health test is priced at $175 plus GST, regardless of model, and includes a mobile technician visit, the battery scan and a CARA approved State of Health certificate.
How long does a Tesla battery health test take?
A standard independent battery health test takes under 10 minutes on-site, with the full diagnostic report and certificate issued digitally within 10 minutes.
Can I use the Managix certificate when listing my Tesla for sale?
Yes. The Managix battery health certificate is designed to be attached to online listings or shown to prospective buyers to independently verify the battery's state of health at the time of sale.
Does Managix test at my location or do I need to visit a testing centre?
Managix tests at your home or workplace across Greater Brisbane, Greater Sydney and Greater Melbourne, or you can visit an NWG ADAS & Windscreens testing centre.
Is the battery health certificate accepted by dealers and finance companies?
Managix's independent battery health certificate is produced to a standard designed for use by private buyers and sellers, used car dealers, and finance or insurance providers assessing a used Tesla's battery condition.
What's the difference between Tesla's own battery data and an independent test?
Tesla's in-car display shows an estimated range figure that can be affected by driving style, temperature, and recent charging habits. An independent test measures state of health, cell balance, and charging performance directly, giving a more objective picture that isn't controlled by the vehicle's own software.
How do I book a Tesla battery health test?
Book a Managix independent Tesla battery health test online through the Managix certification form, and the diagnostic scan is performed on-site through our mobile testing service. Whether you are buying or selling a used Tesla, the certificate gives everyone in the transaction the same verified facts, in a report you can trust.
Sources: Tesla's published Battery and Drive Unit Limited Warranty terms; independent EV battery degradation research (for example, Geotab EV battery degradation studies).