What happens to used EV batteries? Can the waste and recycling problem be solved?

The more EVs spread, the more used batteries will eventually come out of them. “Won’t those huge packs end up as a mountain of hazardous waste nobody can process?” — this concern cannot be avoided in any discussion of how clean EVs are. Batteries do contain hazardous substances, and landfilling them improperly does pollute. What is actually happening around the world, though, is not disposal but the rapid rise of an industry that recovers batteries as a resource and puts them back into circulation.

The short answer: (1) an EV battery that leaves the car goes first to second-life use as stationary storage, (2) when that is done, recycling recovers around 90% of the lithium, cobalt and nickel, and (3) rules that mandate recovery rates and recycled content, led by Europe, have turned recycling into a promising industry. Let’s take those in turn.

First, don’t throw it away: reuse as the first stage

The basic point is that EV batteries are not discarded the moment they leave the car. A pack retiring from automotive duty normally has 70–80% of its capacity left, which is plenty for stationary storage.

Moving it to gentler work — a battery for a home or a commercial building, a buffer that absorbs the swings of solar and wind, backup power — is second life, the first stage that postpones disposal. It extends the working life of each pack and reduces demand for new cells. EV batteries are less and less a single-use item, and more a two-stage one: the car, then stationary storage.

Recycling recovers around 90% of the metals

Once reuse ends, recycling takes back the metals inside. This is the heart of the “waste problem”.

The technology is already at a practical level. Hydrometallurgical processes achieve recovery rates of 95–99% for nickel and cobalt and 85–95% for lithium [1]. Recovered metals go back into new cells, so once this is established, a closed loop lets battery production continue while mining less.

The economics are a strong motive too. A 75 kWh NMC (nickel-manganese-cobalt) pack contains more than US$2,000 of recoverable metal [2], which makes a battery less a piece of rubbish you pay to dispose of than an urban mine packed with metal. That economics is what lifts recycling into an industry that stands on its own rather than on subsidy.

Rules pushing recovery: Europe first, and mandatory

Alongside technology and economics, regulation is pushing circulation hard. The EU leads, and its Battery Regulation, in force since 2023, sets numerical obligations [3].

It requires recycling efficiency for lithium-ion batteries to reach 65% in 2025 and 70% in 2030, cobalt recovery 90% in 2027 and 95% in 2031, and lithium recovery 50% in 2027 and 80% in 2031 [3]. From February 2025 the carbon footprint of a battery must be declared, and from 2027 a battery passport tracking each battery’s materials and history becomes mandatory [3]. Rules requiring a share of recycled content in new batteries complete the picture: recovered material is pushed, by law, into the next generation of cells.

Obligations like these make the return on a recycling investment easier to see, which is how an industry gets built quickly. In Japan, carmakers and cell makers are building their own collection and recycling arrangements, and regulation is moving in the same direction internationally.

A circular economy taking shape as an industry

Against that background, battery recycling is a fast-growing business. The global EV battery recycling market reached about US$13 billion in 2025 and is expected to grow to some US$16 billion in 2026 [4]. Processing capacity has expanded towards 1.6 million tonnes a year, with specialists such as Redwood Materials and Li-Cycle in the United States and Umicore in Belgium scaling up fast [4].

The question has flipped from a defensive one — how do we dispose of used batteries? — to a constructive one: how do we get the resources back? And because the spread of EVs itself guarantees a steady future supply of feedstock, the outlook for the recycling industry is improving rather than worsening.

What remains, and what comes next

The open problems deserve stating. First, the EVs on the road today have not reached the end of their lives, so the volume of batteries coming back is only now beginning to build. Whether enough recycling capacity is ready in time is the question. Second, putting recovered material into new cells needs downstream capacity, in cathode production above all; the gap between regulatory targets and real plant capacity has to be closed. Third, traceability has to be watertight to keep batteries out of informal, improper disposal routes.

None of these is unsolvable; they are matters of design and investment. Battery passports for provenance, mandated recovery rates and recycled-content requirements together move batteries off the straight line from mine to landfill and onto a loop.

In short, the fear that used batteries will become unmanageable waste is being answered by two stages: reuse, then recycling. The technology recovers around 90% of the metals, the economics support it, and the rules require it. Batteries are being treated as a circulating resource rather than as waste. The question to ask is not how to throw them away, but how quickly the loop can be built out.

Summary

EV batteries go first to second-life stationary storage; they are not discarded straight away.
Recycling recovers 95–99% of nickel and cobalt and 85–95% of lithium, which makes a closed loop possible.
A 75 kWh pack holds over US$2,000 of metal. A battery is an urban mine, and the economics pull recovery along.
The EU Battery Regulation makes recovery rates, recycled content and battery passports mandatory.
The global recycling market reached about US$13 billion in 2025. The work ahead is capacity for the coming wave, and downstream plants to absorb the output.

Batteries are not a disposal problem but a resource in circulation — less a mountain of waste than a way into the circular economy.

References and data sources

[1]: Green Li-ion. (2025). Material recovery rules enhancing waste battery recycling. https://www.greenli-ion.com/post/material-recovery-rules-enhancing-waste-battery-recycling / Energy Solutions. (2026). What happens to old EV batteries? 95% lithium recovery. https://energy-solutions.co/articles/sub/ev-battery-recycling-what-happens

[2]: Transport & Environment. (2025). From waste to value: the potential for battery recycling in Europe. https://www.transportenvironment.org/articles/from-waste-to-value-the-potential-for-battery-recycling-in-europe

[3]: European Commission. (2025, July 4). New rules to boost recycling efficiency from waste batteries. https://environment.ec.europa.eu/news/new-rules-boost-recycling-efficiency-waste-batteries-2025-07-04_en / IEA. EU Sustainable Batteries Regulation. https://www.iea.org/policies/16763-eu-sustainable-batteries-regulation

[4]: Energy Solutions. (2026). What happens to old EV batteries? https://energy-solutions.co/articles/sub/ev-battery-recycling-what-happens (global market about US$13 billion in 2025, capacity 1.6 million tonnes a year, Redwood, Li-Cycle, Umicore)