Every compliance artefact a supplier has built before ends at despatch. The battery passport does not. It is a live record that must remain accurate for the working life of the pack — state-of-health data updated as the battery is used, repaired, repurposed and eventually recycled, served on demand to whoever has a legitimate reason to ask. That single characteristic changes the architecture entirely, because you are not producing a document for an audit, you are operating a data service with a fifteen-year horizon against an asset you no longer own. Worth separating two things that get conflated constantly: the regulation is the law, and the passport is the specific data infrastructure that law demands. Building the second without understanding that distinction produces a compliance filing where a live system was required. Ask for the deployment brief to see the linkage mapped against your own cell supply.
Battery Passport and Cell Traceability
Linking cells to packs to vehicles when the cells come from several suppliers, carrying provenance the regulation actually asks for, handing state-of-health data to second-life operators, and building a record that stays live long after the sale.
What Is Actually In Scope
Precision here saves wasted effort, because two common battery types are outside it entirely.
The Cell-to-Pack Problem
The hardest part of the architecture, and the part generic passport guidance skips entirely.
Tiered Access Is a Design Constraint
The passport serves regulatory, operational and circularity purposes simultaneously, which means it has to show different things to different people.
| Tier | Who reads it | Typical content | What it means for your build |
|---|---|---|---|
| Public | Anyone scanning the code | Battery identification, model designation, chemistry, recycling instructions | Must be reachable without authentication and legible to a non-specialist |
| Legitimate operational need | Repair, remanufacturing, second-life, dismantling and recycling actors | Health and performance data needed to assess further use or safe dismantling | Requires an access model that admits parties you have no commercial relationship with |
| Regulatory and authorised | Authorities and notified parties | Verified declarations, conformity evidence, due diligence records | Role-based control protecting commercially sensitive detail while still disclosing |
Carbon Footprint Has an Unusual Unit
Worth reading carefully, because it is not the figure most carbon programmes already produce.
What Is Required When
The regulation phases obligations rather than landing them all at once, and the first passport is narrower than the full framework.
| Point | What applies | Practical implication |
|---|---|---|
| Already in force | Carbon footprint declaration accompanying the battery, third-party verified and publicly accessible | Data collection is a current requirement, not a future one |
| 18 February 2027 | Passport required for every in-scope battery, reachable through a unique identifier on the physical unit | The fixed statutory date — and the first passport centres on identification, type, model and key technical characteristics |
| 2028 onward | Documentation on the share of recovered materials in electric vehicle and industrial batteries | Recycled-content evidence needs supplier declarations gathered well in advance |
| Further delegated acts | Expansion of both scope and format, with lifecycle performance and durability statistics anticipated | Build for extension rather than for the first field list, since amendments may add fields |
Second Life Is an Obligation, Not an Opportunity
Three consequences of the handover requirement, and the third is commercial rather than regulatory.
Where to Start If You Supply Into a Pack
Six moves, ordered by lead time rather than by urgency. The first two have external dependencies you do not control.
Frequently Asked Questions
From 18 February 2027, every electric vehicle battery, every industrial battery above 2 kWh and every light means of transport battery placed on the EU market. Portable and starting, lighting and ignition batteries currently fall outside that scope with no timeline set for extension. The obligation follows the market rather than the manufacturing location — a battery made anywhere needs a passport if it sells into the single market, and customs authorities can electronically verify a valid registered passport on import.
It does not close. State-of-health data must be updated throughout the battery's operational life, and the record has to stay accurate as the pack is used, repaired, repurposed and recycled — served on demand throughout. That makes it a data service with a multi-year horizon rather than a document assembled at despatch, and it is the single characteristic that most changes the architecture required.
By treating it as a supplier data programme rather than an internal reporting project. A pack aggregates cells from multiple suppliers, sites and batches, but the passport is issued against the pack — so the provenance, carbon and recycled-content data underneath it has to be collected from each cell supplier and combined into a single compliant record. Capture which cells and batches went into which pack at assembly, because that linkage cannot be reconstructed afterwards.
Kilograms of carbon dioxide equivalent per kilowatt-hour of the total energy the battery is expected to provide over its service life — a functional unit that makes durability part of the carbon result. The methodology requires site-specific and batch-level data rather than corporate or annual averages, and the figure must be third-party verified and publicly accessible. Until it is reachable through the passport in 2027, the declaration must accompany the battery, so collection is a present obligation.
Three tiers. Public access for battery identification, model designation, chemistry and recycling instructions. An operational tier for parties with a legitimate need — repair, remanufacturing, second-life, dismantling and recycling actors. And a regulatory tier for authorities, with role-based control protecting commercially sensitive information. The middle tier is the design challenge, since it grants access on the basis of role to organisations you have no commercial relationship with.
Secure a verification partner. Carbon footprint, recycled content and due diligence declarations all require third-party verification, and verification capacity in Europe for battery-specific requirements is described as limited relative to the volume needing certification by 2027 — with early procurement explicitly advised for complex supply chains or novel chemistries. It is the longest external lead time in the programme and the one you cannot compress by working harder.
Two. Carbon data is verified and publicly comparable, and authorities can use it to establish performance classes — so demonstrable carbon performance becomes a competitive position rather than only an obligation. And second-life asset value depends on demonstrable condition, which means a pack carrying a credible continuous state-of-health history is worth more than one whose condition must be assessed from scratch. The compliance record doubles as a residual value instrument. Start free with three assets and begin with the linkage.
