Button battery child safety: risks, Reese's Law and first aid
A swallowed 20 mm lithium coin can burn through an esophagus in two hours. Here is what the law changed and what to do in an emergency.
Button batteries injure children when a swallowed cell lodges in the esophagus and generates a caustic burn, with 20 mm lithium coins like the CR2032 causing the worst outcomes. Serious tissue damage can begin within two hours. Immediate action means calling Poison Control at 1-800-222-1222 and getting to an emergency room.
Why are coin lithium batteries so dangerous for children?
The danger is electrical, not chemical leakage. When a battery lodges in the moist tissue of the esophagus, current flows between the two faces of the cell and splits water into hydroxide at the negative terminal. The result is an alkaline burn that deepens for as long as the battery sits there, and it can continue after removal. According to Poison Control, batteries stuck in the esophagus can cause serious burns in as little as two hours, and more than 3,500 button battery ingestions are reported in the United States each year.
Size and chemistry decide the risk. The 20 mm lithium coins, the CR2032, CR2025, and CR2016, are wide enough to catch at the narrow points of a small child's esophagus and carry 3 volts, twice the voltage of an alkaline button cell. Smaller cells like the LR44 usually pass through, though they remain hazardous in the nose or ear. Children under six are at the highest risk, and toddlers between one and three account for most severe injuries. Fatalities have occurred, and survivors of serious cases can face months of feeding tubes, esophageal repairs, and follow up surgeries.
A second, less known scenario: batteries placed in the nose or ear cause the same burns to septum and ear canal tissue. This happens most often with the small cells from hearing aids and toys.
What did Reese's Law change?
Reese's Law is named for Reese Hamsmith, an eighteen month old from Texas who died in December 2020 after swallowing a coin cell from a remote control. Congress enacted the law on August 16, 2022, and it directed the Consumer Product Safety Commission to write mandatory federal rules. Those rules arrived in stages.
| Requirement | What it mandates | In force |
|---|---|---|
| Child resistant packaging | Button and coin cells sold separately or with a product must ship in packaging meeting Poison Prevention Packaging Act standards | February 12, 2023 |
| Product safety standard (ANSI/UL 4200A-2023) | Battery compartments must need a tool or two independent simultaneous movements to open, and must survive abuse testing | October 23, 2023, enforced from March 19, 2024 |
| Package warning labels | Battery packaging must carry standardized keep out of reach and ingestion hazard warnings | September 21, 2024 |
The CPSC business guidance details the testing, and the agency's battery information center summarizes it for families. The practical effect: new remotes, key fobs, scales, and toys sold in the US now hold their batteries behind screws or double action latches, and new coin cells come in packaging that takes scissors and determination to open. The law cannot recall the millions of older devices already in homes, which is why the securing steps below still matter.
What should you do if a child swallows a button battery?
Act immediately, even if the child seems fine. Early symptoms are often absent or look like a cold: drooling, gagging, coughing, refusing food, or irritability.
First, call Poison Control at 1-800-222-1222, or the 24 hour National Battery Ingestion Hotline at 1-800-498-8666, and head to the nearest emergency department. Do not wait for symptoms. Tell the ER staff a battery ingestion is suspected so an X-ray happens fast; a battery shows a telltale double ring halo that distinguishes it from a coin.
Second, give honey if it is safe to do so. Research from Nationwide Children's Hospital showed that honey coats the battery and slows the burn. The Poison Control triage guideline recommends it when four conditions hold: the child is at least 12 months old, the battery was swallowed within the last 12 hours, the child can swallow normally, and honey is on hand. Give 2 teaspoons (10 mL) every 10 minutes, up to 6 doses, on the way to the hospital. Never let honey delay the trip.
Third, know the do nots. Do not induce vomiting. Do not give food or drink other than the honey protocol. Do not use nose or ear drops if a battery is lodged there, since fluid accelerates the injury. Removal of an esophageal battery is an emergency procedure, ideally within two hours of ingestion.
How do you secure batteries and devices at home?
Walk your home with a short checklist. Coin cells hide in remote controls, car key fobs, kitchen and bathroom scales, thermometers, flameless tea lights, musical greeting cards, light up toys, fidget spinners, and hearing aids. Anything from before 2024 likely predates the compartment rules.
Check every battery compartment and retire or tape shut any device whose door opens without a screwdriver. Store spare cells in their original child resistant packaging, inside a locked or high cabinet, never loose in a junk drawer. Dead cells still carry enough charge to injure, so tape both faces of a spent coin cell the moment it comes out of a device and recycle it promptly. Greeting cards and cheap novelty items with sealed cells belong in outside bins, not bedroom wastebaskets a toddler can reach.
Finally, spread the word to grandparents and babysitters, whose homes and hearing aids are a common source. Knowing which cells are in your own devices helps; a quick check on the CellChart lookup or the watch battery chart tells you whether a device takes a high risk 20 mm lithium coin or a smaller, lower risk cell.