Battery Health Score Methodology

The 10 Battery Health Evaluation Factors

The high-voltage battery is the single most critical and expensive sub-component in an electric or plug-in hybrid vehicle. Our Battery Health Score models pack integrity across 10 empirical parameters:

1. Chemistry Type & Degradation Profile: Cell chemistry inherent stability (e.g., LFP vs. NMC vs. NCA) and cycle-life degradation rates.
2. Thermal Management Architecture: Liquid cooling vs. passive air cooling, active pre-conditioning efficiency, and extreme climate thermal regulation.
3. Warranty Terms & Capacity Thresholds: Length of warranty (years/miles) and explicit capacity retention guarantees (e.g., 70% retention at 8 yrs/100,000 mi).
4. Real-World Capacity Retention Data: Empirical fleet telemetry tracking capacity loss over 50,000, 100,000, and 150,000 miles.
5. Fast Charging Tolerance & C-Rate Stress: Impact of frequent Level 3 DC fast charging on lithium plating and internal resistance growth.
6. Climate Performance & Cold Sensitivity: Range drop and charging speed degradation in sub-freezing (<20°F) and high ambient (>95°F) temperatures.
7. Pack Repairability & Module Serviceability: Ability to replace individual failed cell modules vs. requiring a mandatory full pack replacement.
8. Out-of-Warranty Replacement Cost: Cost per kWh for remanufactured or OEM replacement battery packs.
9. Recall & Safety History: Thermal runaway risk history, battery management system (BMS) software recalls, and manufacturing defect notices.
10. Known Degradation Anomalies: Specific model-year anomalies such as premature cell imbalance or BMS calibration drift.

Data Status Categories

To ensure complete transparency, every battery evaluation classifies data into three categories:

• Known Data: Verified OEM specifications, EPA testing files, and third-party laboratory cell breakdown analysis.
• Assumed Data: Standardized degradation curves derived from chemistry benchmark testing when vehicle-specific high-mileage data is limited.
• Unknown Data: Proprietary BMS firmware code or unreleased long-term degradation telemetry.