Recycling & Circularity Developed 2025 · C13 4 min
Unlocking the Potential of Second-Life Batteries: Opportunities and Challenges
Second-life batteries take retired electric vehicle packs that can no longer meet automotive demands but still hold useful capacity, and redeploy them for stationary storage and grid support. As electric mobility scales, the volume of retired packs is rising fast, and this case study examines whether repurposing them is economically viable. Written for an investor considering entry into the market, it weighs opportunities against safety risks, performance variability and an incomplete regulatory picture.
The opportunity and its competitive pressures
Retired EV batteries often retain significant energy storage capacity, making them candidates for second-life applications such as utility-scale storage, grid stabilisation, off-grid power banks and wheeled storage systems. The appeal is clear: extend a battery's useful life, capture value that would otherwise be lost, and support a circular economy. The market is young, though, and faces pressure from two directions. Upstream, cheap new batteries imported from China undercut repurposed packs on price. Downstream, recycling companies compete for the same retired batteries as feedstock. Repurposing itself is labour-intensive because pack designs differ across manufacturers, requiring manual inspection for cracks or leaks, testing and grading, disassembly to pack, module or cell level, and reassembly into containers or cabinets to build a second-life BESS.
Regulation across regions
Rules for second-life batteries vary widely and remain in early stages. In the EU, Regulation 2023/1542, specifically Article 73, has helped lawful repurposing take hold, reflected in the number of European players active in the space. To stop qualifying as waste, a battery prepared for reuse must have documented evidence of its state of health confirming fitness for the new use case, with that documentation supplied alongside the battery, and it must comply with a forthcoming Commission act setting technical and verification requirements that is not yet fully specified. The United States has moved further on standards, with UL 1974 defining the sorting and grading of packs, modules and cells intended for repurposing, though relatively few companies operate there despite that clarity. China introduced new rules in early 2025 through its Quality Certification Center, requiring traceability-code modification and application-specific certifications, including standards for second-life LFP batteries in communication base stations. Other markets such as India, Japan and Australia have not yet addressed second-life management and are likely to adapt frameworks from Europe, China or the US later.
Testing, safety and business models
Before a second-life battery can be deployed safely, its condition must be assessed through electrical tests that are non-destructive, since destructive testing would prevent reuse. These tests establish key parameters, above all the state of health and state of charge, to confirm the battery can perform reliably. In the US this evaluation follows UL 1974, and Europe has yet to develop an equivalent standard, which is a notable gap. A recurring source of uncertainty is ownership and the split of responsibility between manufacturers, owners and recyclers across a battery's full life cycle, which complicates warranties and liability. On business models, the case distinguishes remanufacturing, where cells or modules are replaced to extend a pack's first life in a vehicle, from repurposing into stationary BESS. Chemistry shapes the choice: LFP is low cost and expensive to recycle, so reusing it to extend income can make more sense than recovering its materials.
What it means for the industry
The economics of second-life batteries hinge on factors outside the technology itself. Regulation can shape market dynamics decisively, as the contrast between many active EU players and fewer US ones despite UL 1974 suggests. Competition from cheap new imports sets a hard price ceiling, though rising import tariffs in some markets could improve the case for extending existing batteries when local production is limited or not cost-competitive. Standardisation gaps, especially the absence of a European counterpart to UL 1974, add cost and risk, and unresolved ownership questions weigh on financing. For investors, the market rewards those who understand regional regulation, can manage labour-intensive testing and grading reliably, and can position against both new-battery imports and recyclers competing for the same feedstock.
Key Takeaways
Retired EV batteries often retain enough capacity for stationary storage, grid support and off-grid applications.
Repurposing competes upstream with cheap Chinese new batteries and downstream with recyclers chasing the same feedstock.
EU Article 73 requires documented state-of-health evidence before a battery stops counting as waste, with technical rules still pending.
UL 1974 is the leading US standard for sorting and grading second-life packs, and Europe lacks an equivalent.
Non-destructive testing of state of health and state of charge is essential because destructive tests would prevent reuse.
Remanufacturing extends a pack's first life in a vehicle, while repurposing converts packs into second-life BESS.
Low-cost, recycling-expensive LFP is often better suited to reuse than to materia
Disclaimer: This case study was developed and presented by BatteryMBA participants as part of the Case Study Track. Views, analysis and recommendations are the authors' own. BatteryMBA does not take responsibility for the accuracy or completeness of the content and it should not be relied upon as investment, engineering or legal advice.
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