8 EV Makers Jointly Deny 'Battery Locking' Investigation Rumors

On May 10, 2026, eight leading Chinese new energy vehicle and battery manufacturers—including BYD and CATL—issued a joint statement clarifying that no regulatory authority had summoned them over alleged battery 'locking' practices. The clarification directly addresses growing concerns in key export markets—including Southeast Asia, Australia, and Latin America—regarding software-based battery capacity restrictions, OTA update transparency, and ongoing compliance with UL/UN38.3 certification requirements for EV battery packs and related accessories.

Event Overview

On May 10, 2026, BYD, Contemporary Amperex Technology Co. Limited (CATL), and six other major Chinese EV and power battery enterprises jointly released an official clarification denying rumors that they had been summoned by regulators over battery 'lock-down' or 'capacity limiting' practices. The statement confirmed no such regulatory engagement occurred and emphasized adherence to international safety and performance standards for exported EV battery packs and associated components.

Industries Affected

Direct Exporters of EV Battery Packs and Accessories

These companies face heightened scrutiny from overseas customs, certification bodies, and end customers regarding firmware behavior and post-sale capacity management. The joint clarification helps stabilize buyer expectations, especially in markets where UL/UN38.3 re-certification or local type-approval may be triggered by perceived software interventions.

Supply Chain Service Providers (e.g., Certification Agencies, Logistics Compliance Advisors)

Service providers supporting cross-border EV component shipments must now verify whether clients’ OTA policies and battery management system (BMS) documentation align with the clarified position. Misalignment could delay shipments or trigger additional audit requests in jurisdictions requiring full disclosure of embedded software logic affecting battery performance.

Aftermarket Parts Distributors and EV Accessory Retailers

Distributors selling branded or white-label battery modules, thermal management kits, or BMS upgrade tools in target regions may experience shifting customer due diligence requirements. Buyers are increasingly requesting evidence of non-restrictive firmware design and verifiable compliance continuity—not just initial certification.

Key Focus Areas and Recommended Actions for Stakeholders

Monitor Official Regulatory Communications in Target Markets

While no formal investigation occurred, regulators in Australia (ACCC), ASEAN member states (e.g., Thailand’s TISI, Indonesia’s BSN), and Brazil’s INMETRO have recently published draft guidance on EV software transparency. Stakeholders should track final versions and assess alignment with current product documentation and OTA release notes.

Review Documentation Packages for Exported Battery Products

Specifically verify that user manuals, technical datasheets, and UL/UN38.3 test reports explicitly state whether BMS software includes configurable or remotely adjustable capacity limits—and whether such features are disabled or disclosed in export variants. Ambiguity here increases compliance risk during post-market surveillance.

Distinguish Between Policy Signals and Operational Requirements

The joint statement resolves a rumor—but does not alter existing certification rules. Companies should avoid assuming this eliminates future scrutiny; instead, treat it as confirmation that proactive transparency (e.g., publishing BMS update logs, offering firmware version verification tools) remains the most effective risk mitigation strategy.

Prepare Customer-Facing Materials for Regional Sales Teams

Develop standardized Q&A documents and technical briefings for regional partners and distributors—focused on how battery pack compliance is maintained across OTA cycles, and what contractual or technical safeguards prevent unintended capacity reduction. These materials support consistent messaging during procurement reviews or technical audits.

Editorial Perspective / Industry Observation

Observably, this joint clarification functions less as a policy milestone and more as a market-stabilizing signal. It does not introduce new regulation nor revise existing standards—but it does confirm that major suppliers prioritize export-market compliance consistency over opaque software-based optimization strategies. Analysis shows that the coordinated response reflects growing sensitivity among exporters to reputational and operational risks tied to perceived lack of software transparency. From an industry perspective, this episode highlights how informal market rumors—especially those touching on safety-critical systems—can rapidly affect procurement confidence across fragmented regulatory environments. Continued attention is warranted, particularly as ASEAN and LATAM countries advance localized EV technical regulations.

In summary, the May 10, 2026 clarification reaffirms the operational stability of China’s EV battery exports under current international compliance frameworks—but underscores that software-related disclosures are now a de facto component of technical due diligence. It is better understood not as a resolution of underlying regulatory questions, but as a timely reinforcement of transparency expectations in global EV supply chains.

Source: Official joint statement issued by eight Chinese EV and battery enterprises on May 10, 2026. Note: No regulatory body has confirmed or denied involvement; the statement represents the sole verified source. Ongoing developments in ASEAN, Australian, and Brazilian EV regulatory drafts remain under observation.