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5% or Less: China's New Battery Health Standard Targets the Used-EV Trust Gap

An electric vehicle battery module on a clean production line, with a technician inspecting a digital display showing battery health metrics.
Originally published at China Industry Intel. Read the complete report.

5% or Less: China's New Battery Health Standard Targets the Used-EV Trust Gap

China's MIIT has introduced GB/T 46991.1-2025, a voluntary national standard capping deviation between displayed and measured State of Available Energy (SOCE) at 5%. The rule sets minimum energy retention thresholds: 82% after 5 years/100,000 km, 75% after 8 years/160,000 km, and 70% after 10 years/200,000 km. While initially recommended rather than mandatory, the standard directly addresses consumer distrust in battery health reporting — a friction point that has suppressed used-EV market liquidity.

Key Market Takeaways:

  • Residual value impact: Standardized SOCE disclosure creates a comparable battery health benchmark across brands, enabling more accurate resale pricing and accelerating used-EV market development.
  • Manufacturer burden: Automakers must upgrade BMS reporting systems to account for auxiliary energy consumption via "virtual kilometers," increasing R&D and software costs.
  • Second-life cascade: Clear retention thresholds at 10-year/200,000 km endpoints provide a data foundation for battery recycling and grid storage repurposing economics.

Conclusion: The standard signals China is building the regulatory infrastructure for a mature EV lifecycle economy — not just manufacturing dominance, but post-sale transparency.


>> Read the full in-depth report with complete metric tables and market forecasts on China Industry Intel.


More CII coverage: EV & Battery

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