What happens to EV batteries when they reach the end of their life?

Electric vehicles are becoming more common on UK roads. As more drivers switch to EVs, questions are growing about what happens to their batteries when they reach the end of their useful life.

The good news is that an EV battery does not simply become waste. Like a smartphone or laptop battery, its capacity gradually decreases over time. When it no longer delivers the range or performance a driver expects, it may still have useful life left.

Repair, reuse and second life

Depending on its condition, technicians can repair or refurbish an EV battery. This can allow the battery to continue powering the vehicle.

When a battery no longer suits automotive use, it could have a second life. Companies can repurpose retired EV batteries for stationary energy storage. For example, they can store electricity from solar panels or help manage electricity demand.

Repurposing a battery takes more than simply removing it from a vehicle. Specialists must assess, dismantle and safely adapt each battery. They also need to consider its remaining capacity, reliability and cost.

What happens when the battery is finished?

Eventually, repair or reuse may no longer make financial or practical sense. At this point, recycling becomes the next step.

EV batteries contain valuable materials such as lithium, nickel, cobalt, copper and graphite. Specialist recycling processes can recover these materials for future use. This reduces the need to extract new raw materials.

The International Energy Agency (IEA) describes battery recycling as an increasingly important future source of critical minerals. It could also help make battery supply chains more secure and resilient.

Recycling still has an environmental impact. It requires energy, transportation and specialist facilities. However, recovering materials instead of relying solely on virgin resources can help create a more circular economy:

Raw materials → battery → vehicle → reuse → recycling → recovered materials → new battery

How are EV batteries recycled?

There is no single recycling method for every EV battery. Different battery chemistries require different processes. These can include mechanical separation, high-temperature treatment and chemical processing.

Some recycling processes produce black mass. This concentrated mixture contains valuable materials from lithium-ion batteries. Recycling companies can then process the black mass to recover individual elements.

Technology continues to develop. Researchers are working to improve battery collection, sorting and the recovery of materials such as lithium, nickel, cobalt and copper.

We’re still at the beginning

EV battery production has grown rapidly, but most batteries produced in recent years are still in vehicles. This creates a time lag before large numbers reach the end of their first life.

The IEA estimates that end-of-life batteries will not become the dominant source of recycling feedstock until around the mid-2030s. The systems being developed today will therefore need to handle a much larger volume of batteries in the future.

Governments are also introducing measures to improve battery sustainability. For example, the EU’s Batteries Regulation sets targets for recovering valuable materials from waste batteries. It also includes requirements covering collection, recycling and battery design.

In the UK, batteries used to power electric and hybrid vehicles fall under the industrial battery category. Businesses that handle, treat or export waste batteries must follow specific requirements.

Are EV batteries bad for the environment?

There is no simple answer. Manufacturing EV batteries has an environmental impact. Raw material extraction and the energy needed for manufacturing are key factors.

However, looking only at battery production or disposal misses the bigger picture. A battery could go through several stages before it reaches the end of its useful life:

Repair → refurbishment → vehicle use → second life → recycling → recovered materials → new batteries

The aim is to keep the battery and the valuable materials inside it in use for as long as possible.

As EV numbers grow, the industry will need safe, efficient and economically viable ways to manage batteries throughout their lifecycle.

The battery’s first life may end, but that does not necessarily mean its useful life has to.