What are the odds of a serious injury from a child swallowing a button battery?
Evidence quality 4.88/5
Eight-dimension review score against the quality rubric . Each dimension scored 1–5.
- D1 Source grounding
- 5/5
- D2 Source authority
- 5/5
- D3 Arithmetic
- 5/5
- D4 Uncertainty
- 4/5
- D5 Scope
- 5/5
- D6 Prose
- 5/5
- D7 Perception honesty
- 5/5
- D8 Caveat completeness
- 5/5
Lifetime probability · lifetime, subgroup
1 in 250,000
0.0004% lifetime chance
Most people underestimate this.
range 1 in 500,000 to 1 in 100,000
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≈ As likely as
Perceived
Button battery ingestion is one of the child-safety fears that most parents have heard of but few carry an accurate mental model of. Compared with choking, drowning, and falls, it rarely comes up in baby-proofing checklists, and when it does it is usually framed as "watch for loose batteries" rather than as a time-critical pediatric emergency. The fear is typically vague rather than numeric — parents know it is bad but do not know how bad, how fast, or which batteries matter most.
Rough estimate: Most parents do not carry a number for this fear at all — the hazard is known to exist but the severity, the 2-hour window, and the specific role of 20mm lithium coin cells are usually absent from the mental model
Source: editorial intuition, not polled
Actual
~15 severe pediatric injuries per year (US children under 6)
US children 0-6, severe button-battery injuries (esophageal burns, perforations, tracheoesophageal fistulae, vocal cord paralysis, death)
Show derivation
Likelier normally reports lifetime-US-adult probabilities, but this entry is scoped to the peak-risk age window (0-6) for a single US child. The headline number counts severe outcomes — esophageal burns, perforations, tracheoesophageal fistulae, vocal cord paralysis, and death — not the much larger count of any emergency-department visit for a battery exposure. Jatana and colleagues (Pediatrics, 2022) estimated about 7,032 battery-related pediatric ED visits per year in the US across 2010-2019, of which 85% involved button batteries and 84% were children aged 5 years or younger. That yields roughly 5,000 button battery ED visits per year in the under-6 group — an order of 1 in 700 for any ED-visit exposure across a seven-year window against a population of ~24 million US children 0-6. The severe-outcome subset is much smaller. CPSC documented 27 deaths and an estimated 54,300 battery-related injuries treated in US EDs across 2011-2021, a bit over 2 deaths per year. National Capital Poison Center and Litovitz et al. surveillance puts the "major or fatal outcome" count on the order of 10-20 per year, concentrated almost entirely in the 20mm+ lithium coin-cell subset. 15 severe injuries per year across 24 million children, compounded over a seven-year window, is 15 × 7 / 24,000,000 ≈ 4.4e-6, which rounds to about 1 in 250,000 per child during the 0-6 window. The fatal subset alone is roughly an order of magnitude lower — on the order of 1 in 2 to 4 million per child during the same window.
Caveats: The severe-injury headline counts esophageal burns, perforations, tracheoesophag…
The severe-injury headline counts esophageal burns, perforations, tracheoesophageal fistulae, vocal cord paralysis, and death — not the much larger all-exposures count that shows up in Jatana's ED-visit dataset. The ratio between the two is roughly two orders of magnitude and is the main source of confusion when comparing sources: Litovitz and the NCPC registry count outcomes, Jatana counts encounters, and the two numbers look inconsistent only because they are measuring different things. Both are cited above. Litovitz 2010 and Pasternak 2018 draw on overlapping National Capital Poison Center surveillance, so they are two views of the same dataset, not independent verification. The 20mm+ lithium coin-cell subgroup carries the overwhelming majority of severe outcomes — older 1.5V alkaline and silver-oxide cells, and cells under 15mm, are meaningfully less dangerous per ingestion, though still not benign. Post-Reese's-Law enforcement began in 2023-2024, which is too recent for the published surveillance literature to resolve its effect; the protective multiplier above is a forward-looking estimate rather than a measured one. Finally, this entry covers ingestion and insertion injuries together because the CPSC figure bundles them; roughly 90% of ED visits in Jatana's data were ingestions and the rest were nasal, ear, or mouth exposures.
Regional breakdown
The headline figure averages across very different populations. Here’s how the probability varies by geography or context:
| Region / context | Lifetime probability | Notes |
|---|---|---|
| Severe injury (the headline), US child 0-6 | 1 in 250,000 |
~15 severe pediatric injuries per year — esophageal burns, perforations, tracheoesophageal fistulae, vocal cord paralysis, death — concentrated almost entirely in the 20mm+ lithium coin-cell subset. Compounded across the 0-6 window against a US population of ~24 million children in that age band. |
| Any battery-related ED visit, US child 0-5 | 1 in 667 |
Jatana et al. reported 24.5 battery-related ED visits per 100,000 US children aged 5 or younger per year across 2010-2019. Compounded across six years of the peak-risk window, cumulative exposure rate is roughly 1.5 per 1,000 — about 400 times the severe-injury rate. Most of these are uneventful radiographs and observation discharges, not major complications. |
| Fatal outcome only, US child 0-6 | 1 in 1,428,571 |
CPSC counted 27 pediatric battery deaths in the US across 2011-2021, or roughly 2-3 deaths per year. Spread across 24 million children in the 0-6 band and compounded across the seven-year window, fatal-outcome risk is on the order of 1 in 1.5 million per child — roughly an order of magnitude below the all-severe-injury headline. |
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Pick challenger
Roughly 15 severe injuries and about 2 to 3 deaths per year in US children
are attributable to button battery ingestion — esophageal burns, perforations,
tracheoesophageal fistulae, vocal cord paralysis, and fatal outcomes. Against a US
population of about 24 million children in the 0-6 window, compounded across seven
years, that works out to roughly 1 in 250,000 per child for any severe outcome
and on the order of 1 in 1.5 million per child for a fatal one. Those are small
numbers in absolute terms — comparable in magnitude to the lifetime odds of dying
in a plane crash — and they are the reason button battery ingestion is tagged
underrated rather than a top-ten parental fear. The shape of the risk is wrong
for availability bias: low frequency, high severity, and concentrated in a single
product subtype most parents cannot name.
The interesting feature is the two-hour window. Button batteries lodged in the esophagus cause injury not by mechanical obstruction but by electrolysis — the tissue contacting the anode and cathode completes a local circuit and generates alkaline fluid, which can burn through the esophageal wall in as little as two hours. Pasternak and colleagues, in a 2018 review in Insights into Imaging, document full-thickness burns and perforations occurring inside that window. Litovitz and colleagues, in the canonical 2010 Pediatrics surveillance paper, reported a 6.7-fold increase in major or fatal outcomes from 1985 to 2009 — an increase that tracked the rise of 20mm lithium coin cells (CR2032 and similar) in remote controls, key fobs, greeting cards, and small electronics. The same paper found that 92% of fatal ingestions were not witnessed and at least 54% of fatal cases were initially misdiagnosed, usually as coins on radiography. The two-hour clock is often already running before anyone knows there is a clock.
Reese’s Law, named for Reese Hamsmith, an 18-month-old who died in 2020 after ingesting a button cell from a remote control, was signed on August 16, 2022. It directs the CPSC to mandate child-resistant packaging for button and coin batteries and secured battery compartments in consumer products — either tool access or two independent simultaneous movements to open. In September 2023 the CPSC adopted ANSI/UL 4200A-2023 as the mandatory federal standard. That the law was passed in 2022 rather than earlier is the most economical summary of this entry: the hazard has been documented in the peer-reviewed literature since the 1980s, the severe-outcome rate was rising rather than falling, and federal regulatory action took two decades and a named fatality. Post-enforcement epidemiology will take several more years to resolve, so the 1-in-250,000 headline is a pre-Reese’s-Law number and should be expected to drift downward for the compliant subset.
Claim ledger
Every number below is what each source reported, with the verbatim quote we relied on and how we arrived at our figure. Click any link to verify directly.
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[1] Pediatrics — Jatana KR, Rhoades K, Melchionna A, Fosnight AM, Smith GA — Pediatric Battery-Related Emergency Department Visits in the United States: 2010-2019
Pediatric Battery-Related Emergency Department Visits in the United States: 2010-2019- Statistic
An estimated 70,322 (95% CI: 51,275-89,369) battery-related pediatric ED visits in the US across 2010-2019, or 9.5 per 100,000 children annually; 24.5 per 100,000 per year among children 0-5; button batteries implicated in 84.7% of cases where battery type was described; ingestions accounted for 90.0% of ED visits- Excerpt
“"An estimated 70 322 (95% confidence interval: 51 275-89 369) battery-related ED visits [occurred in the United States from 2010 through 2019] or 9.5 per 100 000 children annually. [...] The ED visit rate was highest among children aged ≤5 years compared with those 6 to 17 years (24.5 and 2.2 per 100 000 children, respectively). The mean patient age was 3.2 years (95% confidence interval: 2.9-3.4). [...] Button batteries were implicated in 84.7% of visits where battery type was described. [...] Ingestions accounted for 90.0% of ED visits, followed by nasal insertions (5.7%), ear insertions (2.5%), and mouth exposures (1.8%)." ”
- Source data from
- 2022-09-01
- Accessed
- 2026-04-11 · archived copy
- Calculation
- Jatana et al. is the anchor for the all-exposures denominator. 9.5 per 100,000 children per year across all ages 0-17 translates to 24.5 per 100,000 per year in the under-6 peak-risk band. Compounded across the seven-year 0-6 window, cumulative ED-visit risk for any battery exposure is roughly 1.7e-3, or about 1 in 580 per child. Restricting to button batteries (85% of visits) drops that to about 1 in 680. This is the "any exposure" figure, which is two orders of magnitude higher than the severe-outcome headline. The severe-outcome headline comes from the Litovitz 2010 surveillance data and NCPC fatal-case registry rather than from Jatana's all-cause ED visits, because Jatana's dataset is designed to count encounters rather than outcomes.
- Independence
- Jatana et al. draws from the NEISS product-injury sampling system (CPSC), which is a distinct pipeline from the National Capital Poison Center surveillance that feeds Litovitz 2010 and Pasternak 2018. Genuine independent corroboration on the ED-encounter side of the problem, though both ultimately describe US pediatric battery exposures.
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[2] Pediatrics — Litovitz T, Whitaker N, Clark L, White NC, Marsolek M — Preventing Battery Ingestions: An Analysis of 8648 Cases
Preventing Battery Ingestions: An Analysis of 8648 Cases- Statistic
8,648 battery ingestions reported to the National Battery Ingestion Hotline (1990-2008); 6.7-fold increase in major or fatal outcomes from 1985 to 2009; 20-25mm cell ingestions rose from 1% to 18%; lithium-cell ingestions rose from 1.3% to 24%; outcomes significantly worse for 20mm+ lithium cells in children under 4; 92% of fatal and 56% of major outcome ingestions were not witnessed; at least 27% of major outcome and 54% of fatal cases were initially misdiagnosed- Excerpt
“"All 3 data sets showed worsening outcomes, with a 6.7-fold increase in the percentage of button battery ingestions with major or fatal outcomes from 1985 to 2009. [...] Ingestions of 20- to 25-mm-diameter cells increased from 1% to 18% of ingested button batteries between 1990 and 2008, paralleling a rise in lithium-cell ingestions from 1.3% to 24%. [...] Outcomes were significantly worse for large-diameter lithium cells [...] and children younger than 4 years. The 20-mm lithium cell was implicated in most severe outcomes. Most fatal (92%) or major outcome (56%) ingestions were not witnessed. At least 27% of major outcome and 54% of fatal cases were misdiagnosed, usually because of nonspecific presentations." ”
- Source data from
- 2010-05-24
- Accessed
- 2026-04-11 · archived copy
- Calculation
- Litovitz et al. is the canonical surveillance paper for the severe-outcome side of button battery ingestion. The 6.7-fold rise in major or fatal outcomes from 1985 to 2009, concentrated in 20mm+ lithium coin cells, is the empirical basis for the "underrated" myth framing and for the 20-fold personal multiplier on 20mm+ lithium cells. The under-4 age concentration is the basis for the 0-6 scope. This study is also the source for the "not witnessed" and "frequently misdiagnosed" caveats — the reason the 2-hour window matters is that parents and clinicians often do not know the clock has started.
- Independence
- Litovitz draws from the National Battery Ingestion Hotline and the NCPC fatal-case registry — the primary US pipeline for severe-outcome tracking. Pasternak 2018 is a downstream review of the same NCPC data. Methodologically distinct from Jatana's NEISS-based encounter counts and from CPSC's product-incident database, which together bracket the denominator.
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[3] Insights into Imaging — Pasternak et al. — Button battery ingestion in children — a potentially catastrophic event of which all radiologists must be aware
Button battery ingestion in children — a potentially catastrophic event of which all radiologists must be aware- Statistic
~3,300 battery-related ED attendances per year in the US between 1990 and 2009; 13 fatalities and 73 major complications over 1985-2009; 4.4-fold increase in clinically significant events over the final 3 years vs the initial 3 years; 12.6% of children under 6 ingesting 20-25mm cells had a major complication or death; full-thickness burns and esophageal perforation can occur within 2 hours- Excerpt
“"[...] an annual incidence of 3300 battery-related emergency department attendances in the USA between 1990 and 2009 [...] 13 fatalities and 73 major complications [...] a 4.4-fold increase in clinically significant events and a 6.7-fold increase in major or fatal outcomes over the final 3 years compared to the initial 3 years. [...] 12.6% of children under 6 years ingesting 20-25 mm battery cells experiencing a major complication or death. [...] full thickness burns and oesophageal perforation which may occur within as little as 2 h following the ingestion of button batteries [via] electrolytic production of alkaline fluid via formation of a local circuit by oesophageal tissue contacting both the anode and cathode." ”
- Source data from
- 2018-04-24
- Accessed
- 2026-04-11 · archived copy
- Calculation
- The Pasternak review is the cleanest source for the 2-hour window and the electrolytic injury mechanism, both of which are load-bearing for the "underrated" framing and for the >2-hour personal multiplier. The 12.6% major-complication rate among under-6 ingesting 20-25mm cells is also the empirical anchor for the 20mm+ lithium subgroup multiplier. This review and Litovitz 2010 draw on overlapping NCPC surveillance data, so treat them as two views of the same underlying dataset rather than independent estimates.
- Independence
- Pasternak's numbers trace back to the same National Capital Poison Center surveillance that Litovitz maintains, so this source corroborates rather than independently verifies the Litovitz figures.
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[4] US Consumer Product Safety Commission (CPSC) — Making Families Safer from Button Cell or Coin Battery Dangers; Reese's Law Leads to New Federal Mandatory Safety Standard
Making Families Safer from Button Cell or Coin Battery Dangers; Reese's Law Leads to New Federal Mandatory Safety Standard- Statistic
At least 27 deaths and an estimated 54,300 injuries treated in US emergency rooms from button cell or coin battery ingestions or insertions, 2011-2021; Reese's Law signed August 16, 2022; CPSC voted to adopt ANSI/UL 4200A-2023 as mandatory safety standard in September 2023- Excerpt
“"Between 2011 and 2021 in the United States, there were at least 27 deaths and an estimated 54,300 injuries treated in emergency rooms resulting from button cell or coin batteries being ingested or inserted. [...] Reese's Law, named in honor of Reese Hamsmith, an 18-month-old child who died after ingesting a button cell battery from a remote control, was enacted on August 16, 2022 [and] mandates that CPSC implement federal safety requirements for button cell or coin batteries and consumer products containing such batteries." ”
- Source data from
- 2023-09-20
- Accessed
- 2026-04-11 · archived copy
- Calculation
- 27 deaths / 11 years ≈ 2.5 pediatric battery deaths per year in the US; 54,300 injuries / 11 years ≈ 4,900 ED injury visits per year, consistent with Jatana's 7,000 all-age battery-related ED visits per year once restricted to severe injuries and/or under-18. Used to anchor the mortality sub-figure (~1 in 2-4 million per child 0-6) and the "severe injury" count cited in the native figure. Also the authoritative citation for Reese's Law dates and requirements.
- Independence
- CPSC's product-incident database integrates death-certificate data with hospital and consumer hazard reports. Partially overlaps with Litovitz's NCPC surveillance (both track US pediatric battery deaths) but adds product-identification metadata. Treat as complementary to NCPC and NEISS rather than independent.