The battery carbon footprint declaration: why PCF comes before the passport

Since 18 February 2025, an electric-vehicle battery placed on the EU market must come with a carbon footprint declaration, verified and made public under Regulation 2023/1542. That is a full two years before the digital battery passport becomes mandatory on 18 February 2027, which makes the product carbon footprint (PCF) the first passport attribute to go live in the real world. The declaration is also a preview of how the whole passport will operate: one number per battery model and plant today, performance classes tomorrow, hard limits after that. This article covers how a battery PCF is calculated, which deadlines are stacked behind the first one, and why the recycled content of your feedstock ends up in the carbon arithmetic.

Which batteries need a carbon footprint declaration, and since when?

Article 7 of Regulation 2023/1542 phases the obligation in by battery category. The declaration applies per battery model per manufacturing plant, not per individual unit, and it must be verified by a notified body before the battery is placed on the market.

• EV batteries: declaration mandatory since 18 February 2025.
• Rechargeable industrial batteries above 2 kWh (except those with exclusively external storage): from 18 February 2026.
• LMT batteries (light means of transport, e-bikes and e-scooters): from 18 August 2028.
• Industrial batteries with external storage: from 18 August 2030.

The declaration itself is a short, structured document: the manufacturer's administrative details, the battery model, the geographic location of the plant, the total carbon footprint, its breakdown per lifecycle stage, the identifier of the EU declaration of conformity, and a web link to the public version of the supporting study. From 18 February 2027 the same values become passport data: Annex XIII lists the carbon footprint and its performance class among the publicly accessible attributes of every EV battery passport.

How is a battery carbon footprint calculated?

The unit matters more than most people expect. A battery PCF is expressed in kilograms of CO2 equivalent per kWh of the total energy the battery provides over its expected service life, not per kWh of nameplate capacity. The divisor is therefore capacity times deliverable cycles: a pack that lasts 2,000 cycles spreads its manufacturing emissions across twice as much delivered energy as one that lasts 1,000. Durability is a carbon lever, and the regulation deliberately wires it into the metric.

The numerator covers four lifecycle stages, and the declaration must break the total down by stage:

• Raw material acquisition and pre-processing: mining, refining and precursor chemistry for the cathode and anode materials, plus aluminium, copper and electrolyte inputs.
• Main product production: cell manufacturing and pack assembly, dominated by the plant's electricity consumption.
• Distribution: transport to the point of sale in the EU.
• End of life and recycling: collection, dismantling and treatment, including the credits and burdens of material recovery.

The use stage is excluded: charging electricity is attributed to the vehicle, not the battery. The calculation method is set by delegated act and follows the EU's Product Environmental Footprint rules, with battery-specific requirements on top. The most consequential of these are the electricity modelling rules: for the energy-hungry cell production step, manufacturers must use real, plant-specific electricity data under defined conditions rather than convenient national grid averages. Which is precisely why the same model made in two plants gets two declarations.

What follows the declaration: performance classes and maximum thresholds

The declaration is the first stage of a three-stage ratchet written into Article 7.

• Declaration: state the number, verified, public. In force for EV batteries since 18 February 2025.
• Performance classes: batteries must carry a carbon footprint performance class label, class A being the best. The regulation schedules this from 18 August 2026 for EV batteries, letting buyers compare models on carbon at a glance.
• Maximum thresholds: the Commission sets a maximum lifecycle carbon footprint per category. The regulation schedules this from 18 February 2028 for EV batteries. Above the threshold, the battery cannot be placed on the EU market at all.

Each stage depends on its own delegated act, and delegated acts have slipped before, so treat the later dates as the regulation's schedule rather than a certainty. The direction, however, is not in doubt: carbon moves from a disclosure to a ranking to a market-access condition. A high-carbon battery goes from embarrassing to unsellable within roughly three years of the first declaration.

Why is supplier data the hard part?

Almost none of the difficulty in a battery PCF sits in your own plant. Your electricity meter is yours to read. The dominant share of the footprint sits upstream, in the raw material and precursor stages carried out by suppliers, and often by their suppliers.

• The data is theirs, not yours. Cathode active material, precursor chemicals and refined metals are made by third parties across several tiers. You need their process-level emissions data, per plant, per input.
• Secondary data costs you. Where a supplier cannot or will not provide primary data, generic database values apply, and those conservative defaults are typically worse than what a well-run supplier could actually evidence.
• Consistency is hard. Two suppliers reporting the same material with different methods, boundaries or allocation choices produce numbers you cannot add together. The methodology exists to prevent that, but only if every link applies it.
• Everything must survive verification. A notified body checks the declaration. Every supplier value needs a source, a date and a document behind it, because one unverifiable input makes the whole declaration unverifiable.

This is the same supply-chain plumbing the passport needs for its other attributes, from due diligence to recycled content shares. A manufacturer that solves supplier data collection for the PCF in 2025 has built most of the pipe the 2027 passport will run through.

How does recycled content lower the next battery's footprint?

Recycled feedstock changes the biggest term in the equation. Recovered cobalt, nickel, lithium and copper enter the raw material stage without the mining and primary refining emissions of virgin material, so a cathode built on documented recycled inputs starts life with a structurally lower footprint. Under the PEF rules the benefit is allocated through the circular footprint formula, which makes the credit quantified and auditable rather than a marketing claim.

The regulation then makes that credit compound. From 18 August 2031, new industrial and EV batteries must contain minimum recycled shares: 16% cobalt, 85% lead, 6% lithium and 6% nickel, rising to 26%, 85%, 12% and 15% in 2036. The recyclers feeding those quotas are working from today's end-of-life stage, whose treatment burdens and recovery credits are themselves part of the current declaration. Documented recovered material closes the loop twice: it satisfies the recycled content quota, and it lowers the PCF of the passport it flows into. The catch is provenance. A recycled-content credit is only bankable in a declaration if the batch can be traced from the shredded pack to the new cell, which is a chain-of-custody problem, not a chemistry problem.

Conclusion: the passport's first chapter

The carbon footprint declaration is not an annex to the 2027 passport. It is the passport's first mandatory chapter, live since February 2025, with classes and thresholds queued behind it. Manufacturers who treat it as a one-off PDF will redo the work in 2027; those who treat it as a data pipeline, supplier by supplier and plant by plant, are already building the passport.

Passoria's automated PCF engine turns supplier ESG data into an audit-ready carbon footprint, and our recycled-content chain of custody carries the credit from recovered batch to next passport. If you manufacture, import or recycle batteries for the EU market, our pilot program is open to a limited number of partners.