Lead is used in some EV battery production, and workers face real exposure risks during manufacturing

Lead appears in certain types of EV batteries—particularly in the lead-acid auxiliary batteries that power vehicle accessories and in some experimental solid-state battery designs. During manufacturing, workers who handle raw materials, assemble cells, or work near smelting and casting operations can inhale lead dust or absorb lead through skin contact. Unlike a single dramatic event, lead exposure builds up over time in the body, particularly in bones and organs, and causes damage that may not show symptoms for years.

The risk is not theoretical. Lead is a neurotoxin that affects the nervous system, kidneys, and reproductive system even at low doses. Children are more vulnerable than adults, but occupational exposure in manufacturing plants is the primary concern for workers themselves. Battery manufacturers in the United States operate under Occupational Safety and Health Administration (OSHA) standards that set exposure limits, but enforcement varies and some facilities have recorded violations.

Key Takeaways

  • Lead-acid auxiliary batteries in EVs contain lead, and manufacturing these batteries exposes workers to lead dust and fumes during smelting, casting, and assembly.
  • OSHA sets a permissible exposure limit of 50 micrograms per cubic meter of air averaged over an 8-hour shift, but this limit is based on standards set in 1978 and some health experts argue it is too high.
  • Workers in battery plants should receive baseline blood lead testing before employment and periodic testing during employment to catch exposure early.
  • Lead exposure accumulates in the body over time and can cause neurological damage, kidney problems, and reproductive harm even when individual exposures seem small.
  • Battery manufacturing facilities in the United States must follow OSHA lead standards, but enforcement and worker awareness of rights vary by location and employer.

Where lead appears in EV battery manufacturing

The lead-acid battery that powers an EV's 12-volt electrical system—the one that starts the car and runs the lights, windows, and infotainment system—contains lead plates and lead oxide. This is separate from the main lithium-ion battery pack that propels the vehicle. During manufacturing, lead ore or recycled lead is melted at high temperatures, cast into plates or grids, and assembled with other components. Each step releases lead dust or fumes into the air.

Some experimental solid-state battery designs also incorporate lead compounds as part of the electrolyte or electrode material. These are not yet in mass production, but research facilities and pilot manufacturing lines handle lead in these contexts. The exposure risk is highest for workers directly involved in smelting, casting, grid assembly, and quality testing—roles that exist in every battery plant that produces lead-acid units.

How lead enters the body and what it does

Lead enters the body primarily through inhalation of dust or fumes, though skin contact with lead-contaminated surfaces can also contribute. Once inhaled, lead particles lodge in the lungs and are absorbed into the bloodstream. The body treats lead similarly to calcium and deposits it in bones, where it can remain for decades. Lead also accumulates in soft tissues including the brain, kidneys, and liver.

The damage occurs at the cellular level. Lead interferes with the function of enzymes and disrupts the formation of myelin, the insulation around nerve fibers. In workers, this can cause reduced nerve conduction velocity (slowed reflexes and coordination), memory problems, difficulty concentrating, and mood changes. Lead also damages the kidneys, raising blood pressure and increasing the risk of chronic kidney disease. Reproductive harm includes reduced sperm count in men and increased miscarriage risk in women. The critical point is that these effects can occur at blood lead levels below what causes obvious symptoms.

OSHA standards and what they actually protect

OSHA's Lead in General Industry standard (29 CFR 1910.1025) sets a permissible exposure limit (PEL) of 50 micrograms of lead per cubic meter of air, averaged over an 8-hour workday. Employers must measure air lead levels in work areas where lead is handled, and if levels exceed the action level of 30 micrograms per cubic meter, they must implement engineering controls (like ventilation), work practice controls (like wet sweeping instead of dry sweeping), and personal protective equipment.

The 50-microgram limit was established in 1978 and has not been updated since, despite advances in understanding lead's health effects. The Centers for Disease Control and Prevention (CDC) considers a blood lead level of 5 micrograms per deciliter or higher in adults to be elevated, and some occupational health researchers argue that the OSHA PEL should be lower. This gap means that a worker can be in compliance with OSHA standards and still accumulate lead in their body over time.

Employers must also provide medical surveillance: baseline blood lead testing before a worker begins handling lead, and periodic testing (at least every six months) during employment. If a worker's blood lead level reaches 40 micrograms per deciliter, OSHA requires the employer to remove the worker from lead exposure until the level drops. This is a safety net, but it only works if testing actually happens and results are communicated to workers.

Enforcement and real-world compliance in battery plants

OSHA inspects workplaces in response to complaints, accidents, or as part of routine scheduling, but the agency does not inspect every facility every year. Battery manufacturing plants in the United States have received citations for lead standard violations, including inadequate air monitoring, failure to provide medical surveillance, and insufficient use of personal protective equipment. The frequency and severity of violations vary by facility and region.

Some battery manufacturers have invested in modern ventilation systems, enclosed smelting operations, and rigorous testing protocols. Others operate with older equipment and less rigorous controls. A worker's actual exposure depends on the specific plant, the age of the equipment, the maintenance of ventilation systems, and whether supervisors enforce the use of protective equipment. This variability means that two workers in different plants can face very different exposure risks, even though both are manufacturing lead-acid batteries.

What workers should know about their rights and protections

If you work in EV battery manufacturing and handle lead, you have the right to request a copy of your blood lead test results and the right to know the air lead levels in your work area. Your employer must provide this information. You also have the right to request an OSHA inspection if you believe your workplace is not following lead standards—you can file a complaint confidentially through OSHA's website or by calling your regional OSHA office.

Before accepting a job in battery manufacturing, ask the employer about their lead monitoring program, the results of recent air sampling, and the blood lead levels of current workers (employers may be reluctant to share this, but the question signals that you are informed). If you are already working in the plant, keep your own records of blood lead test results and any symptoms you notice—fatigue, headaches, difficulty concentrating, or mood changes—even if they seem minor. These records can be important if you need to document exposure later.

If you believe you have been exposed to unsafe levels of lead, you can contact your state's occupational health and safety agency (some states run their own programs under OSHA approval) or the National Institute for Occupational Safety and Health (NIOSH), which investigates workplace hazards and can provide guidance.

The broader context: Lead in battery recycling and supply chains

Lead exposure in EV battery manufacturing is part of a larger picture that includes battery recycling and the mining and smelting of raw lead. Recycled lead from old car batteries and other sources is melted and reused in new batteries, and this recycling process also generates lead dust and fumes. Workers in recycling facilities face similar exposure risks as those in primary manufacturing.

The supply chain for lead also matters. Lead ore is mined in several countries, and smelting often occurs in regions with less stringent environmental and occupational standards than the United States. Some of the lead used in U.S. battery manufacturing may come from facilities abroad where worker protections are weaker. This does not change what happens in a U.S. battery plant, but it reflects the global nature of the problem.

Frequently Asked Questions

Can lead from EV batteries leak into the environment if the battery is damaged?

Lead-acid auxiliary batteries are sealed units, so lead does not leak under normal conditions. If a battery is damaged in a crash or during recycling, lead can be released. This is why proper recycling of old batteries is important—facilities that recycle batteries are required to handle lead safely and prevent environmental contamination.

Is the lead in EV batteries the same as the lead that was in old car batteries?

Yes. The lead-acid auxiliary battery in an EV is essentially the same technology as the 12-volt battery in a gasoline car. The main difference is that an EV's auxiliary battery is smaller because the vehicle does not need to start an engine. The lead exposure risk during manufacturing is the same.

What should I do if I think I have been exposed to lead at work?

Request a blood lead test from your employer or occupational health clinic. Keep a record of the result. If you have symptoms like fatigue, headaches, or difficulty concentrating, see a doctor and mention your work with lead. You can also contact OSHA or your state occupational health agency to report concerns about workplace conditions.

Are newer EV batteries eliminating lead?

Lithium-ion batteries, which power the main propulsion system in most EVs, do not contain lead. However, the 12-volt auxiliary battery in nearly all EVs is still lead-acid. Some manufacturers are experimenting with lithium-ion auxiliary batteries, which would eliminate lead from the vehicle entirely, but this transition is still in early stages and has not become standard.

How long does lead stay in the body?

Lead in soft tissues (blood, organs) has a half-life of about 30 days, meaning half of it is eliminated in that time. However, lead stored in bones has a half-life of 20 to 30 years, so it can remain in your body for decades. This is why cumulative exposure over a career is the real concern for workers.