For many in the automotive industry, the battery passport is currently viewed through the lens of compliance. As implementation deadlines approach and regulatory requirements become clearer, much of the conversation has focused on what information must be captured, stored and shared.
However, this lens risks overlooking the opportunities presented by the passport. Instead of being viewed as a compliance burden, battery passports could play a valuable role in determining what happens to batteries in the next stage of their life.
As electric vehicles mature and increasing numbers enter the used market, stakeholders across the automotive ecosystem are being asked to make increasingly complex decisions about battery repair, reuse, repurposing and recycling. Many are finding that these decisions are having to be made without access to trusted lifecycle information.
The result is uncertainty. Consumers question battery health and longevity. Fleet operators struggle to assess residual value. Insurers may replace batteries that could potentially be repaired. Second-life operators inherit assets with limited visibility of their condition and history. Ultimately, value that could have been retained within the system is often lost.
Battery passports have the potential to change that; current discussions largely focus on manufacturing information, material traceability and carbon footprint data – the important foundations, but they only provide part of the picture. We recognise that understanding how a battery was produced is crucial information, however understanding how it has performed throughout its life may be even more valuable.
A battery's repair history, damage history, inspection records and State of Health trends can all provide critical context when determining the most appropriate next step in its lifecycle. The battery passport could become a decision-making tool that helps stakeholders understand a battery's current condition, future potential and remaining value.
For many years, the default industry response to a battery fault has often been replacement. This does not always represent the most technically, economically or environmentally effective outcome. As battery repair capability continues to develop, a growing number of batteries may be suitable for repair rather than replacement, provided sufficient information exists to support that decision.
Battery passports could help build that confidence by recording key lifecycle events, including diagnostic outcomes, repair activities, parts replacements, software updates and post-repair validation testing. Together, these records provide a transparent history of the battery, helping to demonstrate that a repaired battery remains safe, reliable and fit for continued service.
For warranty providers and manufacturers, improved lifecycle data supports faster claims processing, better root cause analysis and more informed decision-making. For fleets and remarketing businesses, it could provide greater confidence when assessing residual value. For consumers, it could help answer some of the most important questions in the used EV market: Has the battery been damaged? Has it been repaired? What is its current condition? How much useful life might remain?
Perhaps most significantly, richer lifecycle data could help unlock greater confidence in second-life applications.
Not every battery that leaves a vehicle has reached the end of its useful life. Many may retain sufficient performance for stationary energy storage and other secondary applications. But determining suitability requires confidence in a battery's condition, safety and remaining lifespan. A battery passport that provides trusted evidence of these factors could help reduce uncertainty and support more informed decisions about repurposing rather than recycling.
Ultimately, the industry's long-term challenge is not simply tracking batteries. It is retaining as much value as possible throughout their lifecycle.
If battery passports evolve to support those decisions, they have the potential to become far more than a compliance requirement. They could become one of the key enablers of a more circular battery economy, helping the industry preserve value, reduce waste and keep batteries in productive use for longer.
