The Battery Passport: Guide to (EU) 2023/1542

Of everything the EU has legislated on product data, the battery passport is the one with the least ambiguity and the least room to wait. It has a fixed date, a defined scope, and a data list that is already written down. If you make batteries in scope, February 2027 is not a planning assumption.

What is the battery passport?

It differs from an ESPR Digital Product Passport in two ways that matter operationally. It comes from its own regulation rather than a delegated act, so its timing is independent. And it is explicitly item-level: every battery gets its own record, keyed to a unique identifier, because the data — particularly state of health — genuinely varies per unit.

Which batteries need a passport?

What data must a battery passport contain?

The regulation and its annexes are unusually specific. The requirements group into six areas, and their difficulty varies enormously.

The three "high" rows share a characteristic: the data does not exist inside your organisation and cannot be created there. It has to come from cell manufacturers, refiners and, for due diligence, mining operations several tiers upstream.

The carbon footprint declaration

The regulation requires a carbon footprint declaration expressed per kWh of total energy delivered over the battery's expected service life, broken down by lifecycle stage and calculated to a Commission-specified methodology.

• Raw material acquisition and pre-processing — usually the largest share, and the one furthest from your control.
• Main product production — cell and pack manufacturing, where your own primary data applies.
• Distribution — transport to the point of placing on the market.
• End-of-life and recycling — treatment and recovery.

Recycled content targets

The regulation sets minimum recycled content shares for four materials, phased in after the passport itself. Reporting recycled content in the passport comes first; hitting the thresholds comes later.

The gap between declaring in 2028 and meeting thresholds in 2031 is the window to change sourcing. Establishing chain of custody to the refiner takes most of it.

State of health: the data that keeps changing

Most passport data is fixed at manufacture. State of health is not — it degrades over years of use, and the regulation requires it to be available to owners and to second-life operators.

This turns the passport from a published record into a maintained one, and it introduces a pipeline problem: battery management system telemetry has to reach the passport over the battery's life, across changes of ownership, and sometimes after the original vehicle has been scrapped.

Who is responsible?

The economic operator placing the battery on the EU market — the manufacturer, or the importer where the manufacturer is outside the EU. In automotive supply chains this is often contested, because the party with the obligation frequently does not hold the data.

• Cell manufacturers hold composition and much of the manufacturing footprint, but often do not place the battery on the market.
• Pack assemblers and OEMs usually carry the legal obligation and must obtain data contractually from cell suppliers.
• Importers carry the obligation for batteries manufactured outside the EU, which is the common case.
• Second-life operators take on responsibilities when a battery is repurposed, including keeping the passport current.

Supply chain due diligence

The due diligence obligation is the requirement most often underestimated, because it is not a data field — it is a management system that has to be documented, third-party verified and published.

Economic operators placing batteries on the EU market must identify and address social and environmental risks associated with the sourcing of cobalt, natural graphite, lithium and nickel. In practice that means knowing where the material came from, which is a far harder question than knowing what it is.

How does the battery passport differ from an ESPR passport?

Both are Digital Product Passports in the general sense, and both are likely to converge on the same underlying standards. But they come from different laws, and the operational differences matter when planning a programme that has to satisfy both.

The row that drives architecture is data volatility. A passport that is written once at manufacture is a publishing problem. A passport that must accept state-of-health updates from a battery management system for fifteen years, across changes of ownership, is a live data pipeline with its own availability and access-control requirements.

If you build for the battery case, the ESPR case is a simplification of it. Building the other way round rarely works, which is a reason for manufacturers subject to both to sequence batteries first even where the ESPR act arrives earlier.

What to do now

1. Confirm scope per product line. The 2 kWh industrial threshold and the LMT definition decide which of your products are affected.
2. Audit cell supplier contracts for data provision obligations, and start renegotiation — this is the critical path.
3. Establish the carbon footprint methodology and identify where you must use primary rather than secondary data.
4. Build the BMS-to-passport pipeline early; state of health is the only requirement that needs a live data path rather than a one-time transfer.
5. Decide serialisation and identity before choosing a platform, so the identifier scheme outlives the vendor.
6. Build one complete passport for a single battery model end to end, well before 2027, to surface the gaps at low cost.