On 18 February 2027 the battery passport becomes mandatory for EV batteries, industrial batteries above 2 kWh, and LMT batteries — the first concrete moment when the Digital Product Passport (DPP) turns from EU concept into a hard production requirement. For an MES, this means exposing roughly seventeen attributes per unit: material origin, carbon footprint, recycled content, batch ID, durability, cell health data. This article walks through ESPR (2024/1781) and the Battery Regulation (2023/1542) without fluff: which MES functions already produce the data, what is missing, how to wire it up architecturally with GS1 Digital Link, and what to do in the nine months left before the deadline.