Used BYD Dolphin battery health & degradation data
Last updated: · 1 sourced data points
The Dolphin hatchback uses BYD's LFP Blade cells. We have found only one published independent SoH result so far, from a very low-mileage car. Sources: EV Database.
Battery options: 44.9 kWh and 60.48 kWh LFP Blade battery.
Chemistry: LFP, BYD Blade prismatic cells (44.9 and 60.5 kWh usable). (EV Database)
Limited data so far – contribute yours
We have 1 sourced data point for the BYD Dolphin, all from individual cars (n=1). Single-car results are anecdotes, not typical values. If you own one, sharing your SoH reading (with mileage and how it was measured) helps every buyer.
All data points
| Variant | Mileage | SoH | Type | Sample | Measured by | Source (date) |
|---|---|---|---|---|---|---|
| Dolphin 60.48 kWh (LFP Blade) | 7,902 km ≈ 4,910 mi |
96.6% | Single car | n=1 | AVILOO FLASH Test (independent SoH) | Carma (2026-07-14) Single car (n=1), Australia, very low mileage. Certificate shows 56 of 58 kWh energy. |
Data gaps: One single-car certificate (n=1, 7,902 km, Australia). No higher-mileage independent data found yet. Please share yours.
What to check when buying a used Dolphin
- Do not confuse it with the smaller Dolphin Surf (2025-on), a different car with different battery sizes. (EV Database)
- Compare any test result with the ranges above and with the ADAC rule of thumb: at least 92% at 50,000 km, 88% at 100,000 km, 84% at 150,000 km, 80% at 200,000 km. (ADAC)
How to check the battery on a used Dolphin
- Ask the seller to fully charge the car (ideally a full AC charge) before you inspect or test it, so the battery management system can balance the cells – MG, for example, says a full slow charge is the only way for its battery to reach the balanced "equalisation" state. (MG Motor Europe)
- Ask for an independent battery test. AVILOO lists FLASH-test support for the Dolphin 44.9, 58.56 and 60.48 kWh packs shown above, so a dealer certificate or a mobile tester can give an SoH figure you can compare with the results on this page. (AVILOO GmbH)
Battery warranty (UK)
BYD (warranty manual for EEA, UK and Switzerland): power battery 8 years (96 months) or 250,000 km (155,350 miles), whichever comes first, with a minimum of 70% capacity retention (SOH ≥ 70%). Basic vehicle cover 6 years / 150,000 km. Gradual capacity loss above the 70% threshold is not covered. Confirm the terms for the specific car with BYD. Source: BYD, checked 2026-10-20. Always confirm the terms for the specific car with the manufacturer.
Sources used on this page
5 sources · 1 data points: 0 from non-AVILOO methods, 1 measured with AVILOO tests.
- Single-car tests (1 source, 1 data point): Carma
- Manufacturer (2 sources): BYD, MG Motor Europe
- Other (specs, guides, news, surveys) (2 sources): EV Database, AVILOO GmbH
Owner-reported and listing values are single cars (n=1) read from the car, an app or an OBD tool – useful examples, not averages. Range-retention figures (Recurrent) measure range, not capacity. Full details: methodology & all sources.
Get this specific car tested
Ad disclosure: we are not currently paid by these providers. If that changes, the specific links will be marked "(paid link)" and this box labelled "Ad". How we make money.
Model averages can't tell you about the car in front of you. An independent battery test (typically a short OBD plug-in test, some remote) gives an SoH figure and often a certificate you can use when negotiating.
- AVILOO – Independent OBD-based battery test (FLASH / Premium) with certificate; available via partners in the UK and EU.
- Generational – UK remote battery health assessment and certificate, used by dealers and fleets.
Prices change – check the provider's site. Provider names are used for identification only.
FAQ
What is the BYD Dolphin battery warranty in the UK?
BYD (warranty manual for EEA, UK and Switzerland): power battery 8 years (96 months) or 250,000 km (155,350 miles), whichever comes first, with a minimum of 70% capacity retention (SOH ≥ 70%). Basic vehicle cover 6 years / 150,000 km. Gradual capacity loss above the 70% threshold is not covered. Confirm the terms for the specific car with BYD.
What battery chemistry does the BYD Dolphin use?
LFP, BYD Blade prismatic cells (44.9 and 60.5 kWh usable).
How can I check the battery of a specific BYD Dolphin?
Use an independent battery test (OBD-based or remote) and compare the result with the ranges on this page. Model averages cannot tell you the condition of one specific car.
Part of our Chinese EVs battery health guide (LFP vs NMC, warranties and checks for 13 Chinese-brand and Chinese-built models).
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