Independent BYD Battery Health Testing for Used EVs
Managix provides independent battery health testing for used BYD EVs, giving buyers, sellers, and dealers a verified state of health (SOH) report they can trust. Unlike the estimated range shown on a BYD's own dashboard, our test measures actual Blade Battery performance and produces a shareable Managix Battery Health Certificate, ready before you buy or sell.
Independent diagnostics for every used BYD model.
Why test the battery before buying or selling a used BYD?
A Managix independent battery health test matters when buying or selling a used BYD 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 Blade 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 BYD'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 BYD's warranty period
What does a BYD battery health test include?
A Managix BYD battery health test includes a State of Health (SOH) measurement of the Blade Battery, cell balance and voltage analysis, a check of charging curve and fast charge performance, and a comparison of current tested range against the original WLTP rating. Every test concludes with a written report and a Managix Battery Health Certificate.
State of Health (SOH) measurement
We measure the Blade 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 Blade 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 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 BYD battery health certification work?
Managix certifies a used BYD'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 BYD'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 BYD'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 BYD models does Managix test?
Managix tests every used BYD model: the Atto 3's Blade Battery pack, all BYD Dolphin battery configurations sold in Australia, the larger Blade Battery packs fitted to the Seal sedan and Seal U SUV, and the Sealion range as it becomes established in the Australian used EV market.
Atto 3 battery health testing
Independent SOH and charging performance testing for the BYD Atto 3's Blade Battery pack.
Dolphin battery health testing
Full diagnostic testing covering all BYD Dolphin battery configurations sold in Australia.
Seal and Seal U battery health testing
Testing for the larger Blade Battery packs fitted to the BYD Seal sedan and Seal U SUV.
Sealion battery health testing
Independent testing for the BYD Sealion range as it becomes established in the Australian used EV market.
What is a good battery health score for a used BYD?
A used BYD's battery is generally considered to be in good health when the capacity retention measured in a Managix battery health test sits above BYD's own warranty threshold and is broadly consistent with its age and total kilometres travelled. BYD's battery warranty is structured around a capacity retention threshold, commonly cited at around 70%, over the warranty period.
BYD's Blade Battery uses lithium iron phosphate (LFP) chemistry, which typically degrades more gradually and linearly than the nickel based chemistries used in some other EVs.
| Approximate age / distance | Typical degradation range |
|---|---|
| 0 to 50,000 km | 0 to 4% |
| 50,000 to 100,000 km | 4 to 8% |
| 100,000 to 150,000 km | 7 to 12% |
| 150,000 km+ | 10 to 18% (varies by model and usage pattern) |
Figures are general guidance ranges based on publicly reported LFP battery degradation data and BYD'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 BYD battery health tests?
Here are answers to common questions about the Managix independent BYD battery health test, including what it costs, how long it takes, using the certificate when you list your BYD for sale, testing at your location, acceptance by dealers and finance companies, and how BYD's Blade Battery differs to test.
How much does a BYD battery health test cost?
Managix's independent BYD 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 BYD 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 BYD 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 BYD's battery condition.
Is BYD's Blade Battery different to test compared to other EV batteries?
BYD's Blade Battery uses lithium iron phosphate (LFP) cell chemistry rather than the nickel based chemistry used in many other EVs. LFP batteries typically show a flatter degradation curve and are generally more tolerant of frequent full charging, but they still benefit from independent state of health testing to confirm actual condition rather than relying on the dashboard estimate alone.
How do I book a BYD battery health test?
Book a Managix independent BYD 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 BYD, the certificate gives everyone in the transaction the same verified facts, in a report you can trust.
Sources: BYD's published battery warranty terms; independent EV battery degradation research (for example, Geotab EV battery degradation studies).