China EV OTA Battery Locking Debate Raises Concerns Over Range and Charging Performance

Concerns surrounding China EV battery locking have intensified after multiple new-energy vehicle owners claimed remote OTA software updates significantly reduced driving range and charging performance in their vehicles. According to reports broadcast by China state media, some EVs originally capable of nearly 500 km CLTC-rated range reportedly delivered less than 300 km in real-world usage after updates modified battery management system parameters. Owners also claimed DC fast-charging times increased considerably following the software revisions, triggering wider debate around transparency, battery safety, and consumer rights across the country’s rapidly growing EV industry.

The practice widely referred to as “battery locking” involves automakers remotely adjusting battery management system settings through OTA updates or dealership software flashing. Vehicle owners alleged these updates reduced usable battery capacity, limited charging power, and restricted discharge depth without clearly explaining the real-world impact beforehand. Industry experts noted that manufacturers can implement such measures by modifying charging thresholds and discharge limits within the battery management system. These restrictions may help lower thermal runaway risks and reduce long-term battery degradation, but they can also result in slower charging speeds and shorter driving range for customers.

One EV owner interviewed during the television report claimed his vehicle previously accepted more than 100 kWh during charging sessions before receiving an OTA update. After the software revision, the vehicle reportedly accepted only around 80 kWh despite the battery health indicator still displaying 95% health status. The same owner also claimed the vehicle’s practical driving range declined from approximately 450–480 km to below 400 km after the update was installed. Such complaints have increased public scrutiny regarding how automakers communicate OTA software changes affecting battery performance and ownership experience.

China regulators have already introduced stricter oversight measures related to EV OTA management. Earlier this year, the Ministry of Industry and Information Technology and the State Administration for Market Regulation released updated guidelines covering OTA software practices. Chinese media referred to the measures as the “OTA four prohibitions,” which include restrictions against undisclosed battery locking, silent forced updates, and the use of OTA software revisions to avoid official vehicle recalls. The updated framework aims to improve transparency and ensure consumers are informed when software updates alter vehicle functionality.

The controversy also expanded after online rumours claimed several automakers had been summoned by regulators regarding alleged battery locking investigations. Reports circulating online suggested eight automakers were questioned and three companies were formally investigated over OTA-related battery restrictions. However, the China Association of Automobile Manufacturers later rejected those reports, stating the rumours lacked official sources and did not align with verified information. Automakers including BYD, Tesla, and Zeekr also denied the online allegations connected to the controversy.

The broader discussion around OTA battery management has emerged alongside rising attention toward EV charging stress and battery safety. Recent industry discussions intensified after tests involving ultra-fast charging systems recorded elevated battery temperatures during high-power charging sessions. Analysts noted that manufacturers are increasingly balancing charging speed, thermal management, and long-term battery durability while competing to offer faster charging technologies. As EV adoption accelerates, software-controlled battery optimization is expected to remain a critical area for both vehicle safety management and customer satisfaction.

China EV Battery Market Share Overview

Legal experts interviewed during the report stated that remotely changing vehicle operating parameters without customer consent could create concerns under consumer protection law, property law, and data privacy regulations. The broadcaster also noted that OTA parameter changes are generally stored within automaker cloud systems, making independent verification difficult for ordinary vehicle owners. As a result, consumers may struggle to confirm whether software updates directly altered battery performance, charging limits, or usable capacity.

Experts advised EV owners who suspect unauthorized OTA changes to disable automatic software installation features, maintain records of charging sessions and software versions, and seek independent third-party inspections where possible. Legal professionals also suggested consumers can file complaints through official consumer protection channels and industry regulators if they believe undisclosed OTA changes negatively affected their vehicles. The debate highlights growing pressure on automakers to improve transparency as software-defined vehicle technologies become increasingly central to the modern EV ownership experience.

Frequently Asked Questions

What is battery locking in electric vehicles?
Battery locking refers to the remote adjustment of battery management system settings through OTA software updates that may reduce usable battery capacity, charging speed, or discharge limits. Automakers may implement these changes to improve battery safety, reduce thermal risks, and slow long-term degradation. However, EV owners in China have raised concerns that such updates can significantly reduce practical driving range and charging performance without clear disclosure about the impact on vehicle usability and ownership experience.

Why are Chinese EV owners concerned about OTA updates?
Chinese EV owners are concerned because some claim OTA updates reduced their vehicles’ driving range and increased charging times after battery management parameters were changed remotely. Several owners reported noticeable declines in usable battery capacity despite healthy battery status indicators remaining unchanged. The issue has raised broader questions about consumer rights, software transparency, and whether automakers should obtain explicit owner consent before making OTA updates that alter core vehicle performance characteristics.

What actions have Chinese regulators taken regarding OTA battery updates?
Chinese regulators introduced updated OTA management rules that prohibit undisclosed battery locking, forced silent updates, and the use of software revisions to avoid recalls. The Ministry of Industry and Information Technology and the State Administration for Market Regulation implemented these measures to improve transparency and strengthen consumer protection in the EV sector. The regulations aim to ensure vehicle owners are informed whenever OTA updates significantly affect battery performance, charging behavior, or driving range.

How can EV owners protect themselves from unauthorized OTA changes?
EV owners can reduce risks by disabling automatic OTA installation settings, keeping detailed charging records, and documenting software version changes after updates. Experts also recommend seeking independent third-party battery inspections if performance changes are suspected. Maintaining evidence related to charging behavior and battery performance may help consumers file complaints through official consumer protection platforms or regulatory channels if undisclosed software modifications negatively impact their vehicle functionality.