A new recommended national standard for electric vehicle battery durability has taken effect, giving electric vehicle owners, manufacturers and service providers a more consistent way to measure how much usable energy remains in an electric vehicle battery after years of operation. The standard, identified as GB/T 46991.1-2025 and titled “Electric vehicle on-board power battery durability requirements and test methods Part 1: Light vehicles,” was organized by the Ministry of Industry and Information Technology and implemented on July 1, 2026.
The central purpose of the standard is straightforward: it aims to make the condition of an electric vehicle battery easier to understand. Many electric vehicle owners ask how much battery capacity remains after five years of use, how much longer the battery can serve the vehicle, and whether the battery health figure shown on the instrument panel is reliable. The new standard addresses those questions by introducing a unified assessment measure for electric vehicle battery durability and by setting disclosure and performance requirements connected to that measure.
For the electric vehicle market, the significance extends beyond a single technical definition. Battery durability is closely linked to electric vehicle resale value, warranty discussions, consumer confidence and long-term ownership costs. A standardized way to describe remaining electric vehicle battery capacity can help buyers compare vehicles more clearly, help owners understand changes in range, and help manufacturers communicate battery performance in a more transparent manner.
1. A Single Metric Brings Electric Vehicle Battery Health Into Focus
The new standard uses SOCE, described as battery usable energy state, as the unified scale for assessing electric vehicle battery durability. In simple terms, SOCE is the ratio of the current actual usable energy of an electric vehicle battery to the usable energy of a new electric vehicle battery. This ratio provides a direct way to describe how much of the original electric vehicle battery capability remains available for driving and other vehicle functions.
The standard explains the concept through a practical example. If a new electric vehicle battery can store enough energy to support 500 km of driving, and after several years of use the battery can store enough energy to support 400 km of driving, the SOCE is 400 divided by 500, or 80 percent. That figure gives the electric vehicle owner a clear indication that the battery now provides 80 percent of the usable energy associated with the new electric vehicle battery condition described in the example.
A higher SOCE value means that the electric vehicle battery still provides a relatively high level of usable energy, so the driving range is closer to the new electric vehicle condition. A lower SOCE value means that electric vehicle battery degradation is more pronounced. This makes SOCE a simple but useful reference point for electric vehicle owners who want to understand changes in battery performance over time.
The use of SOCE also helps reduce confusion caused by different descriptions of electric vehicle battery health. Electric vehicle battery degradation can be discussed in terms of capacity, range, resistance, efficiency or other technical parameters. By placing usable energy at the center of the assessment, the standard gives electric vehicle stakeholders a common reference for durability. The metric is not intended to replace all other technical information, but it provides a consistent benchmark for electric vehicle battery condition.
For electric vehicle owners, the value of such a benchmark is practical. An electric vehicle owner may notice that a vehicle needs charging more often than before, or that the estimated range shown by the vehicle has declined. SOCE helps explain those changes in a structured way. Instead of relying only on subjective impressions, the electric vehicle owner can refer to a standardized ratio that reflects the usable energy remaining in the electric vehicle battery.
2. SOCE Disclosure Rules Target Trustworthy Electric Vehicle Battery Data
The standard also sets disclosure requirements for SOCE data. Electric vehicle manufacturers are expected to provide SOCE information to consumers, and the difference between the displayed SOCE value and the measured SOCE value must not exceed 5 percent. This requirement is designed to ensure that the electric vehicle battery information shown to consumers is accurate and credible.
Under the standard, electric vehicle owners can access SOCE information through the vehicle central display screen or through the manufacturer’s official app. This means that electric vehicle battery condition can be checked in a way that is transparent and easy to find. The requirement that displayed and measured values remain within a 5 percent difference adds an important accuracy check to the disclosure process.
The disclosure rule responds to a common concern among electric vehicle owners: whether the battery health number shown by the vehicle is a true reflection of electric vehicle battery condition. If an electric vehicle battery health display is vague, inconsistent or disconnected from actual usable energy, owners may find it difficult to judge degradation or prepare for future battery-related decisions. The new standard seeks to reduce that uncertainty by tying disclosure to SOCE and by setting an accuracy threshold.
For electric vehicle manufacturers, the disclosure requirement places greater emphasis on data quality and communication. Electric vehicle battery management systems already collect extensive information about battery operation, charging and temperature. The standard encourages manufacturers to present usable energy information in a way that is consistent with the SOCE concept and accurate enough to meet the disclosure threshold. This can support better electric vehicle owner experiences and more constructive discussions when battery performance changes.
- Electric vehicle owners should be able to view SOCE through the vehicle display or the official manufacturer app.
- The displayed SOCE value should remain within 5 percent of the measured SOCE value.
- The SOCE disclosure is intended to make electric vehicle battery condition transparent and comparable.
- The accuracy requirement supports confidence in electric vehicle battery health information.
Transparency in electric vehicle battery data can also support the second-hand electric vehicle market. A used electric vehicle buyer often wants to know how much battery capability remains. If SOCE information is available and subject to a clear accuracy expectation, the used electric vehicle market can benefit from a more consistent way to describe battery condition. This does not eliminate the need for inspection or testing, but it provides a common language for electric vehicle battery durability.
3. Minimum Performance Requirements Set a Durability Floor for Electric Vehicle Batteries
The standard establishes minimum performance requirements, or MPR, for electric vehicle battery durability. These requirements apply at specific mileage and time checkpoints: 5 years or 100,000 km, 8 years or 160,000 km, and 10 years or 200,000 km. At these checkpoints, the standard defines MPR indicators measured by SOCE, providing a baseline for electric vehicle battery performance over time.
These checkpoints are important because electric vehicle battery durability is not a single moment in time. An electric vehicle battery changes gradually, and the rate of change can vary with use patterns, climate, charging behavior and other factors. By setting assessment points at defined time and mileage intervals, the standard gives electric vehicle stakeholders a structured way to consider battery durability across the ownership period.
| Element | Provision | Meaning for Electric Vehicle Stakeholders |
|---|---|---|
| Standard | GB/T 46991.1-2025, “Electric vehicle on-board power battery durability requirements and test methods Part 1: Light vehicles” | Provides a recommended national standard for electric vehicle battery durability assessment in light vehicles. |
| Core Metric | SOCE, battery usable energy state | Expresses current usable energy relative to new electric vehicle battery usable energy. |
| Example | New electric vehicle battery supports 500 km; later it supports 400 km; SOCE equals 400 divided by 500, or 80 percent. | Gives electric vehicle owners a clear ratio for remaining usable energy. |
| Disclosure Accuracy | Displayed SOCE value and measured SOCE value must differ by no more than 5 percent. | Supports trustworthy electric vehicle battery health information. |
| Checkpoints | 5 years or 100,000 km; 8 years or 160,000 km; 10 years or 200,000 km. | Sets defined points for assessing electric vehicle battery durability. |
| Vehicle Categories | Differentiated MPR indicators for light passenger vehicles and light commercial vehicles. | Reflects different electric vehicle use patterns and operating needs. |
| Status | Recommended national standard implemented on July 1, 2026. | May be promoted more widely across the electric vehicle industry over time. |
The MPR provision is described as a minimum performance requirement, which means it provides a baseline for electric vehicle battery durability rather than a complete description of every possible use case. The standard also differentiates between light passenger vehicles and light commercial vehicles, recognizing that these electric vehicle categories can have different operating patterns and durability expectations. This differentiated approach makes the standard more relevant to real-world electric vehicle use.
For electric vehicle owners, MPR indicators can serve as a reference when considering battery performance at key ownership milestones. For electric vehicle manufacturers, the requirements provide a clearer durability benchmark for product planning, testing and customer communication. For the broader electric vehicle market, the combination of SOCE, disclosure accuracy and MPR indicators creates a more structured framework for discussing battery durability.
4. Electric Vehicle Owners Gain a More Transparent Basis for Warranty Discussions
Battery durability is often connected to warranty discussions. An electric vehicle owner may ask whether a decline in range is normal, whether the electric vehicle battery still meets expected performance, and whether a warranty claim is justified. The new standard can help make those discussions more concrete by providing a common metric and defined durability checkpoints.
When SOCE information is available through the vehicle display or the manufacturer’s official app, an electric vehicle owner can monitor changes over time. If the electric vehicle battery shows a measurable decline, the owner can refer to SOCE rather than relying only on estimated range or general impressions. This can make conversations with electric vehicle dealers, service centers and manufacturers more focused on data.
The standard does not eliminate the need for warranty terms, inspection procedures or technical diagnosis. However, it can reduce misunderstandings by giving electric vehicle owners and manufacturers a shared reference for electric vehicle battery condition. The 5 percent accuracy expectation for displayed SOCE also supports confidence that the information shown to the electric vehicle owner is meaningfully connected to measured battery performance.
For electric vehicle owners, greater transparency can also support better planning. A used electric vehicle buyer may want to know how much usable energy remains. An electric vehicle owner considering a long trip may want to understand how battery condition affects range. A fleet operator managing multiple electric vehicle units may want to compare battery durability across vehicles. SOCE and MPR indicators can provide a common basis for those decisions.
The standard’s consumer-facing value therefore lies in clarity. Electric vehicle battery degradation is a natural process, but uncertainty about that process can create anxiety. By making electric vehicle battery condition easier to read and compare, the standard aims to replace guesswork with a more structured understanding of electric vehicle battery durability.
5. Electric Vehicle Manufacturers Face a Clearer Durability Benchmark
For electric vehicle manufacturers, the standard provides a clearer framework for battery durability assessment and communication. The SOCE metric offers a common way to describe usable energy, while the disclosure requirement places attention on the accuracy of information provided to electric vehicle owners. The MPR checkpoints give manufacturers defined durability milestones for light passenger and light commercial electric vehicle applications.
This framework can support engineering and product planning. Electric vehicle battery durability is influenced by cell chemistry, pack design, thermal management, charging strategy and vehicle usage. A standardized assessment approach can help manufacturers compare designs, validate durability performance and communicate results in a consistent manner. It can also encourage greater attention to the full lifecycle of electric vehicle batteries.
The standard is expected to guide electric vehicle manufacturers toward increased investment in accurate battery life evaluation and long-life battery technology. As electric vehicle battery durability becomes more measurable, manufacturers may face stronger incentives to improve battery longevity, refine battery management strategies and provide clearer information to electric vehicle owners. This can support the transition of the electric vehicle industry from scale expansion toward quality improvement.
Manufacturers also need to consider how SOCE information is presented. The standard’s requirement that displayed and measured SOCE values differ by no more than 5 percent means that display logic, data processing and customer interfaces must be aligned with the underlying electric vehicle battery condition. This is not only a technical matter but also a communication matter, because electric vehicle owners need to understand what the displayed value means.
Clear communication can strengthen trust in electric vehicle technology. When electric vehicle owners see that battery health information is standardized and subject to accuracy expectations, they may feel more confident in the vehicle and in the manufacturer’s support. This trust is important for the continued growth of the electric vehicle market, especially as more consumers consider electric vehicle ownership for the first time.
6. The Standard Encourages Long-Life Battery Technology for the Electric Vehicle Industry
The standard’s emphasis on durability can influence research and development priorities across the electric vehicle industry. Battery life is a key factor in electric vehicle ownership costs, resale value and environmental performance. By providing a common metric for electric vehicle battery durability, the standard can help focus attention on technologies and strategies that extend useful battery life.
Long-life battery technology is not limited to cell chemistry. It also involves pack design, thermal management, charging control, software algorithms and service practices. The standard’s SOCE and MPR framework can support a more comprehensive approach to electric vehicle battery durability by connecting measurement, disclosure and performance expectations. This can encourage electric vehicle manufacturers and battery suppliers to consider durability throughout the product lifecycle.
Accurate battery life evaluation is another important area. If electric vehicle battery condition can be assessed more reliably, manufacturers can improve warranty planning, service diagnostics and product development. Electric vehicle owners can benefit from clearer information, while the industry can benefit from better data on how electric vehicle batteries perform in real-world use.
The standard’s potential influence on the electric vehicle industry also extends to competition. When durability is measured in a consistent way, electric vehicle manufacturers may compete not only on range, charging speed and features but also on long-term battery performance. This can support higher quality in the electric vehicle market and give consumers more meaningful information when comparing electric vehicle models.
At the same time, the standard is described as a recommended national standard at present. Its wider adoption across the electric vehicle industry may develop over time. Even in its current form, it provides a reference framework that can guide electric vehicle manufacturers, suppliers, service providers and consumers toward a more transparent understanding of battery durability.
7. Light Passenger and Light Commercial Electric Vehicle Applications Receive Tailored Treatment
The standard applies to light vehicles and sets differentiated MPR indicators for light passenger vehicles and light commercial vehicles. This distinction recognizes that electric vehicle use patterns can differ significantly between passenger and commercial applications. A light passenger electric vehicle may be used primarily for personal mobility, while a light commercial electric vehicle may operate with different load, route and duty cycles.
Differentiated requirements help the standard remain relevant to real-world electric vehicle operation. For light commercial electric vehicle users, battery durability can directly affect route planning, operating costs and vehicle availability. For light passenger electric vehicle owners, battery durability can affect range confidence, resale value and long-term ownership satisfaction. By considering both categories, the standard addresses the electric vehicle market in a more practical way.
The standard’s structure also allows electric vehicle stakeholders to compare durability expectations within the appropriate vehicle category. This is important because a single durability target may not reflect the varied demands placed on different electric vehicle types. The differentiated approach supports a more balanced assessment of electric vehicle battery performance.
For fleet operators using light commercial electric vehicles, standardized SOCE information can support decisions about vehicle rotation, maintenance and replacement. For individual electric vehicle owners, SOCE information can support decisions about charging habits, service checks and resale. In both cases, the value of the standard lies in providing a common reference for electric vehicle battery condition.
8. Implementation Status Leaves Room for Wider Electric Vehicle Market Adoption
The standard is a recommended national standard and was implemented on July 1, 2026. It is expected that the standard may be promoted across the electric vehicle industry in the future. This implementation status is important because it indicates that the framework is available for use while the electric vehicle market continues to develop its practices around battery durability assessment and disclosure.
As electric vehicle manufacturers, suppliers and service providers gain experience with SOCE and MPR indicators, the standard may support greater consistency in how electric vehicle battery durability is described. Consumers may also become more familiar with SOCE as a way to understand electric vehicle battery condition. Over time, this familiarity can strengthen the role of standardized battery durability information in the electric vehicle market.
The standard’s implementation also creates an opportunity for the electric vehicle industry to align technical measurement with consumer communication. A metric is most useful when it is both accurate and understandable. SOCE is designed to be simple enough for electric vehicle owners to interpret while still being connected to measurable battery performance. The 5 percent disclosure threshold reinforces the importance of accuracy in that communication.
Wider adoption may also encourage the development of supporting services for electric vehicle battery inspection and evaluation. As SOCE information becomes more common, electric vehicle owners may seek clearer explanations of battery condition, and service providers may need to align their diagnostic practices with the standard’s concepts. This can contribute to a more mature electric vehicle after-sales ecosystem.
9. What Electric Vehicle Stakeholders Should Watch as the Standard Takes Effect
Electric vehicle owners should watch for SOCE information in vehicle displays and manufacturer apps. Understanding the ratio can help owners interpret changes in battery performance and prepare for service discussions. Owners may also want to track SOCE at different points in the ownership period to see how electric vehicle battery condition changes over time.
Electric vehicle manufacturers should watch for how SOCE disclosure requirements influence vehicle interfaces, data accuracy and customer communication. The standard’s 5 percent accuracy expectation places importance on reliable battery data and clear presentation. Manufacturers that communicate battery durability transparently may strengthen trust among electric vehicle buyers and owners.
Electric vehicle dealers and service providers should watch for the standard’s role in battery health discussions. SOCE and MPR checkpoints can provide a common reference for explaining electric vehicle battery condition and for discussing maintenance, warranty and resale topics. A consistent vocabulary can reduce confusion and support more productive conversations with electric vehicle owners.
Used electric vehicle buyers should watch for the availability of SOCE information as a useful supplement to inspection and testing. While SOCE does not replace a thorough vehicle evaluation, it can provide a standardized indicator of remaining usable energy. This can help used electric vehicle buyers compare options with greater clarity.
Policymakers and industry bodies should watch for the standard’s broader adoption and for the development of supporting practices around electric vehicle battery durability. The standard’s combination of SOCE, disclosure accuracy and MPR indicators provides a foundation for more consistent electric vehicle battery assessment. Continued development in this area can support consumer confidence and quality improvement in the electric vehicle market.
10. Electric Vehicle Battery Durability Becomes Measurable and Comparable
The new standard marks an important step in making electric vehicle battery durability more measurable and comparable. By using SOCE as a unified assessment measure, by requiring SOCE disclosure with a 5 percent accuracy threshold, and by setting MPR indicators at defined time and mileage checkpoints, the standard gives electric vehicle stakeholders a structured framework for understanding battery condition.
For electric vehicle owners, the framework can reduce uncertainty about battery health and provide a clearer basis for warranty discussions. For electric vehicle manufacturers, it can support more consistent durability assessment and communication. For the electric vehicle industry, it can encourage investment in accurate battery life evaluation and long-life battery technology, supporting a shift toward quality improvement.
As the standard takes effect and potentially gains wider use across the electric vehicle market, its impact will depend on implementation. Accurate data, clear presentation and consistent application will be essential. If those elements are delivered, electric vehicle owners can gain greater confidence in battery information, and the electric vehicle industry can benefit from a more transparent and durable foundation for future growth.
The core message of the standard is simple: electric vehicle battery durability should not be a matter of guesswork. Through SOCE, disclosure requirements and minimum performance requirements, the standard gives electric vehicle users and the electric vehicle industry a common language for battery condition. That common language can help electric vehicle ownership become more predictable, more transparent and more closely connected to real-world battery performance.