The second life of retired EV batteries: repair, reuse or recycle

When an EV battery is removed, technicians assess its condition to decide whether it can be repaired, reused in another vehicle, or sent for recycling. Many retired packs retain 70 to 80 percent of their original capacity and can be repurposed for stationary energy storage or grid support. California, for example, has used Nissan Leaf and Honda batteries to store solar power.

After removal, EV batteries are inspected by specialists. A pack holds many cells, often grouped in modules, so a technician may replace a module or part rather than discard the whole unit. If safe, a used pack might serve in another compatible car. Severe crash damage or total-loss vehicles can make repair impractical.

Undamaged retired packs may hold 70–80% of original capacity. They can become stationary storage, backup power, or grid-balancing assets; California has used Nissan Leaf and Honda batteries to store solar energy. Recycling recovers steel, aluminum, and copper. Shredding and separation yield black mass containing electrode materials, with chemistry determining further heat or chemical extraction. Recycling is costly and energy-intensive but can lower demand for mined resources.