Sustainability Language

Circular Economy & Materials

Battery second life

The reuse of electric vehicle batteries — typically retired from vehicles at 70–80% of original capacity — in less demanding stationary applications before recycling.

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Definition

The practice of giving used EV batteries a further working life in applications with lower performance demands, such as stationary energy storage, home solar integration, grid support and backup power. Vehicle batteries are generally considered at end-of-life for automotive use when state of health falls to roughly 70–80% of initial capacity — a level at which most of their energy capacity remains usable.

References

Circunomics

70–80% SoH retirement threshold; stationary storage applications; economic and environmental rationale.

Overview

What it means

Second life extends the value extracted from each battery's embedded materials and manufacturing footprint, spreads production costs over more years, and delays recycling. It creates a cascade between transport and energy sectors: the same asset first powers a vehicle, then buffers a building or grid. Realising this requires reliable state-of-health data — one reason the EU battery passport mandates it.

How it is used

Automakers, energy companies and specialist repurposers run second-life projects (for example stadium and data-centre storage built from retired EV packs). Economics depend on testing and requalification costs versus falling prices of new batteries; safety, warranty and liability frameworks are still maturing.

Why it matters

With millions of EV batteries approaching retirement this decade, second life determines whether they become a waste problem or a storage resource. It is a concrete test of circular design: batteries engineered for disassembly and data transparency capture far more second-life value.

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