Real-world State of Health (SoH) for the BYD Seal, based on 8 aggregated data points across 2023–2023 model years. On average the Seal loses about 1.5% per year — here's what that means for range, resale, and when (if ever) you'd need a replacement.
State of Health vs. mileage, from real Seal data. The curve flattens after the initial break-in drop — the steepest losses happen early, then degradation slows.
| Mileage | Typical SoH | Status | Est. range |
|---|---|---|---|
| 50,000 km | 95.8% | Excellent | 439 km |
| 100,000 km | 93.5% | Excellent | 429 km |
| 150,000 km | 91% | Excellent | 417 km |
Estimates from aggregated real-world data. Individual results vary with climate, charging habits, and use.
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Gentle Level 2 home charging generates far less heat than DC fast charging — the single biggest driver of degradation. See our best home EV chargers for 2026 to slow wear and save on every charge.
Based on aggregated real-world data, the BYD Seal loses roughly 1.5% of its capacity per year. At 100,000 km it typically retains about 93.5% State of Health, and it is covered by a 8-year / 160,000 km battery warranty down to 70% capacity. Most Seal batteries are expected to outlast the rest of the car.
A full BYD Seal pack is around 82.5 kWh. At current installed prices of roughly $120–$180 per kWh, an out-of-warranty replacement would land in the $9,900–$14,900 range — but module-level repair is often far cheaper, and most owners never need it. See our EV battery replacement cost guide.
A used BYD Seal can be an excellent value as long as the battery is healthy. Always check the State of Health before buying — at 90.5% (typical at higher mileage) the car still delivers strong daily range. Run a free VoltChek estimate and confirm with an OBD2 scanner before you commit.
Two ways: get an instant data-driven estimate from VoltChek using your year and mileage (free, no hardware), or read the exact value from the car's Battery Management System with an OBD2 scanner. We recommend starting with the free estimate, then verifying with a scanner.