China Sets EV Traction Battery Testing Standard for 2027

China Introduces National Standard for In-Service EV Traction Battery Testing

China has released a national standard establishing testing methods for traction batteries used in electric vehicles, addressing the need for consistent battery condition assessments across the new energy vehicle (NEV) market. Announced by the State Administration for Market Regulation (SAMR) on October 21, the standard, titled Test Method for Electric Vehicles Traction Battery in Service (GB/T 48100-2026), was jointly released by SAMR and the Standardization Administration of China (SAC). It will take effect on March 1, 2027. The new framework establishes general testing conditions, inspection requirements, and assessment methods for in-service traction batteries, with applications spanning battery safety hazard screening, used vehicle transactions, and functional testing.

Organizations Behind GB/T 48100-2026

The Ministry of Industry and Information Technology (MIIT) proposed the standard, while several automotive and battery industry organizations contributed to its drafting. The main drafting organizations include China Automotive Technology and Research Center Co., Ltd. (CATARC), Contemporary Amperex Technology Co., Ltd. (CATL), and BYD Auto Industry Co., Ltd. Their involvement brings together organizations associated with automotive technology research, battery manufacturing, and vehicle production. The standard establishes a common technical basis for assessing batteries already in service, rather than focusing exclusively on new battery products. Its implementation is intended to support more consistent inspections and provide a clearer framework for evaluating traction battery condition across relevant electric vehicle applications in China.

Battery Inspection Requirements and Testing Methods

GB/T 48100-2026 specifies general test conditions for traction batteries in service and defines inspection items covering several important aspects of battery condition. These include visual appearance, airtightness, insulation, and thermal management systems. Together, these inspection areas provide a structured approach to examining physical condition and selected safety-related characteristics. The standard also establishes methods for estimating usable capacity retention rates, voltage consistency, and internal resistance consistency. These measurements can help characterize battery performance and the consistency of battery operation. By specifying common testing procedures, the standard provides a more uniform technical basis for evaluating in-service traction batteries during safety screening, functional assessments, and other applicable inspection activities.

Applications in Battery Safety Screening and Used Vehicle Transactions

The standard is designed for multiple applications involving electric vehicles and their in-service traction batteries. One application is battery safety hazard screening, where structured inspection methods can support the identification and assessment of potential battery-related concerns. Another is used vehicle transactions, where battery condition can be an important consideration for buyers and sellers. Functional testing is also covered, giving the framework relevance beyond vehicle resale alone. The standard's common inspection items and assessment methods are intended to make battery condition evaluations more consistent across these use cases. However, the announcement does not specify a single mandatory inspection procedure for every transaction or establish a particular battery health threshold for determining whether a vehicle may be sold.

Addressing Inconsistent Battery Assessment Practices

Before the introduction of GB/T 48100-2026, the absence of unified testing methods for in-service traction batteries in new energy vehicles created a need for a more standardized assessment framework. Differences in testing approaches can make battery condition information harder to compare between inspections and transactions. The new national standard addresses this gap by defining general test conditions, inspection items, and methods for estimating selected battery performance characteristics. Its stated objectives include improving transparency about battery condition and vehicle transactions, protecting consumer rights and interests, and promoting more standardized practices in the NEV aftermarket. These objectives are particularly relevant when vehicle stakeholders need a consistent technical basis for discussing the condition of a battery that has already been in use.

Implementation Timeline and Standard Identification

The national standard is identified as GB/T 48100-2026 and will become effective on March 1, 2027. Its release was announced by SAMR on October 21, with SAMR and SAC identified as the organizations responsible for releasing it. MIIT proposed the standard, and CATARC, CATL, and BYD Auto Industry were among its main drafting organizations. The implementation date gives relevant stakeholders a defined point from which the standard takes effect. The announcement, however, does not provide additional implementation milestones, enforcement arrangements, compliance penalties, or detailed transition requirements. Those matters should not be assumed from the publication date alone. The confirmed scope concerns methods for testing traction batteries in service, including safety screening, used vehicle transactions, and functional testing.

Industry Impact & Outlook

GB/T 48100-2026 establishes a common testing framework that could make traction battery assessments more comparable across China's electric vehicle aftermarket. For used vehicle buyers and sellers, more consistent information about battery condition may support clearer transaction discussions and help address uncertainty surrounding battery performance. Inspection providers and other relevant stakeholders will have a defined set of testing areas and assessment methods to consider as the standard takes effect on March 1, 2027. For automakers and battery manufacturers, the framework also highlights the importance of evaluating batteries throughout their service life, not solely when they are produced. The announcement does not establish specific market outcomes, mandatory battery health thresholds, or enforcement details, so the practical effects will depend on how the standard is applied.

Frequently Asked Questions

What is China's GB/T 48100-2026 standard?
GB/T 48100-2026 is China's national standard specifying test methods for traction batteries that are already in service in electric vehicles. Jointly released by the State Administration for Market Regulation and the Standardization Administration of China, it establishes general testing conditions, inspection items, and methods for assessing selected battery characteristics. Its scope includes battery safety hazard screening, used vehicle transactions, and functional testing. The standard is intended to address the lack of unified testing methods for in-service traction batteries and improve transparency about battery condition in the new energy vehicle aftermarket.

When does the new electric vehicle battery testing standard take effect?
China's GB/T 48100-2026 standard will take effect on March 1, 2027, following its release by the State Administration for Market Regulation and the Standardization Administration of China. The announcement was made on October 21. The effective date identifies when the standard comes into force, but the announcement does not specify additional implementation milestones, transition arrangements, or enforcement penalties. Stakeholders should distinguish the confirmed effective date from any separate implementation guidance that may be issued. The standard covers testing methods for in-service electric vehicle traction batteries rather than providing a general set of requirements for every aspect of electric vehicle manufacturing or operation.

Which battery inspection items are covered by GB/T 48100-2026?
GB/T 48100-2026 identifies appearance, airtightness, insulation, and thermal management systems among the inspection items for in-service electric vehicle traction batteries. It also provides methods for estimating usable capacity retention rates, voltage consistency, and internal resistance consistency. These elements address different aspects of battery condition and performance and create a common technical basis for applicable testing activities. The standard's scope includes safety hazard screening, used vehicle transactions, and functional testing. The announcement does not provide numerical acceptance thresholds for these measurements, so specific pass-or-fail limits should not be inferred from the list of inspection items alone.

Who proposed and drafted China's new traction battery testing standard?
The Ministry of Industry and Information Technology proposed GB/T 48100-2026, while the main drafting organizations include China Automotive Technology and Research Center Co., Ltd., Contemporary Amperex Technology Co., Ltd., and BYD Auto Industry Co., Ltd. The standard was released jointly by the State Administration for Market Regulation and the Standardization Administration of China. These organizations have different roles in the standard's development and release. The announcement identifies the principal organizations involved but does not provide a complete list of every contributor or describe the individual drafting responsibilities of each organization.

How could the standard affect used electric vehicle transactions in China?
The standard could support more transparent used electric vehicle transactions by establishing consistent methods for assessing the condition of traction batteries already in service. Battery condition is a relevant consideration when evaluating a used electric vehicle, and common inspection methods may help stakeholders discuss selected battery characteristics using a more uniform technical basis. The standard specifically identifies used vehicle transactions as one of its applications. It is also intended to protect consumer rights and promote standardized aftermarket practices. However, the announcement does not establish a mandatory battery health score, a minimum capacity retention threshold for resale, or a guarantee that every used vehicle transaction will include battery testing.

What is the main objective of GB/T 48100-2026?
The main objective of GB/T 48100-2026 is to establish unified testing methods for traction batteries in service and improve transparency about battery condition and electric vehicle transactions. The standard addresses the previously identified lack of consistent testing methods for batteries in new energy vehicles. By specifying general test conditions, inspection items, and methods for estimating selected performance characteristics, it provides a common framework for relevant assessment activities. Its stated aims also include protecting consumer rights, encouraging standardized practices in the NEV aftermarket, and supporting the industry's high-quality and sustainable development. The actual effects will depend on how the framework is applied after its effective date.