Under Article 77 of the EU Batteries Regulation (Regulation (EU) 2023/1542), industrial batteries above 2 kWh require a battery passport from 18 February 2027, and as of September 2026 no legislative proposal changing that date has been identified. Breaking down the passport data attribute list (the version aligned with DIN DKE SPEC 99100) for the stationary ESS category shows that, of 80 mandatory attributes, only 5 static attributes must be recorded on the line at individual-battery level; the remaining static attributes are fixed once at battery-model level. In an assumed scenario (4 GWh/year pack line, pack takt time 338.6 s), passport-driven line capture events amount to 5 per pack (0.0148…