Small and shiny, button batteries power everything from singing greeting cards to remote controls, flashlights, and kids’ watches. They are everywhere in a child’s world. And they are deadly when swallowed. If your child has a severe injury from a button battery that came loose from a product, you need to understand product liability law. This is not about punishing a company. It is about holding the right party responsible for a defect that harmed your child.

Product liability claims against children’s products normally fall into one of three buckets. The first is a manufacturing defect. That means something went wrong during the actual production of the item. The product as designed was safe, but one specific unit came off the line with a flaw. For a button battery compartment, a manufacturing defect might be a plastic casing that was not properly sealed or a screw that was stripped, allowing the battery door to pop open. It is not a general design issue. It is that one unit that is bad.

The second bucket is a design defect. This is broader. The entire product category has a problem because the design itself is unreasonably dangerous. For example, a toy’s battery compartment might be secured by a single screw that children can easily unscrew with a coin. Or the compartment door might rely on friction rather than a locking mechanism. If the basic design fails to keep a coin-sized battery out of a toddler’s hands, that is a design defect. The manufacturer knew or should have known that children younger than three would be able to open it. A design defect exists even if every unit was built exactly as intended.

The third bucket is a failure to warn. This is about instructions and labels. Even if the battery compartment is secure, the manufacturer must clearly warn parents about the choking and chemical burn hazards of the battery itself. A vague warning that says “keep away from children” is not enough. The warning must state the specific danger of internal burns within two hours if swallowed. It must also tell parents to seek emergency medical care immediately. If the warning is buried in tiny print on the back of the package, or it does not mention the severe injury risk, that is a failure to warn.

Button battery injuries are particularly brutal. When a battery lodges in a child’s esophagus, saliva triggers an electrical current. That current creates hydroxide, a caustic chemical that burns through tissue. In as little as two hours, a child can suffer serious esophageal burns or a perforation that requires multiple surgeries or a feeding tube. Some children die. This injury is unlike choking on a toy part, where a child chokes and can be saved by Heimlich. The burn continues even after the battery is removed if tissue damage is done.

Which parties can you sue? The manufacturer of the product itself, first. But also the battery producer in some cases, if the battery design itself is unsafe, such as not having a bitter coating or a child-resistant packaging. Retailers who sold the damaged product can also be liable in some states. However, the most direct target is the company that designed and marketed the product. You need to prove that the product was defective when it left the defendant’s control and that the defect caused your child’s injury. You do not need to prove negligence. Product liability is a strict liability area. That means you do not have to show that the company was careless. You only have to show that the product was defective and that the defect caused harm.

For children’s products, the law is tougher. A child cannot be said to have assumed the risk of a defective product. A toddler chewing on a toy is not acting unreasonably. And if the product is meant for a child, the manufacturer must anticipate how a child will actually interact with it. That means kids will put things in their mouths. They will pull on parts. They will try to open compartments. A manufacturer that ignores this reality is held to a higher standard.

If your child has been injured by a button battery, take immediate steps. Seek medical care, then preserve the product and the battery if possible. Do not send the product back to the company without photographing and documenting the condition. Contact a product liability attorney who handles children’s injuries. You may be entitled to compensation for medical expenses, pain and suffering, future care, and loss of income. And in some cases, punitive damages if the company willfully ignored known risks.

Do not let the company convince you that the injury was your fault. If a battery compartment failed, or the warning was inadequate, the law is on your side. Manufacturers owe a duty to children who cannot protect themselves. When they breach that duty, they pay.