The EU Battery Regulation (2023/1542) establishes a comprehensive legal framework to ensure that batteries placed on the EU market are sustainable, safe, and recyclable, with far-reaching implications for global battery industries, research communities, and supply chains. Among its key provisions, Article 7 introduces mandatory carbon footprint (CF) reporting for certain battery types, beginning with electric vehicle (EV) batteries. The current situation conflicts with the objectives of the EU Green Deal and the EU Battery Regulation itself, both of which depend on timely, transparent, and reliable CF rules to support decarbonization and resource efficiency. Swift adoption of clear and stable methodological rules is urgently needed to provide regulatory certainty, enable market readiness, and maintain Europe's competitive position in the sustainable battery market. More information: Mohammad Ali Rajaeifar et al, The EU battery carbon footprint rules need urgent attention, Nature Energy (2025).