{
  "slug": "button-battery-ingestion",
  "question": "What are the odds of a serious injury from a child swallowing a button battery?",
  "category": "kids",
  "tags": [
    "toddler",
    "household"
  ],
  "no_reliable_estimate": false,
  "perceived": {
    "description": "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.\n",
    "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",
    "kind": "intuition"
  },
  "native": {
    "display": "~15 severe pediatric injuries per year (US children under 6)",
    "numerator": 1,
    "denominator": 250000,
    "unit": "per child, 0-6 age window",
    "population": "US children 0-6, severe button-battery injuries (esophageal burns, perforations, tracheoesophageal fistulae, vocal cord paralysis, death)"
  },
  "normalized": {
    "lifetime_us_adult": 0.000004,
    "display": "1 in ~250,000 per child during the 0-6 window (US)",
    "log_value": -5.4,
    "assumptions": "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.\n",
    "uncertainty": {
      "low": 0.000002,
      "high": 0.00001
    },
    "scope": "subgroup_lifetime"
  },
  "sources": [
    {
      "url": "https://pubmed.ncbi.nlm.nih.gov/36032018/",
      "title": "Pediatric Battery-Related Emergency Department Visits in the United States: 2010-2019",
      "publisher": "Pediatrics — Jatana KR, Rhoades K, Melchionna A, Fosnight AM, Smith GA",
      "source_type": "peer_reviewed",
      "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%).\"\n",
      "source_date": "2022-09-01",
      "source_accessed": "2026-04-11",
      "archive_url": "http://web.archive.org/web/20250915161535/https://pubmed.ncbi.nlm.nih.gov/36032018/",
      "calculation_notes": "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.\n",
      "independence_note": "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.\n"
    },
    {
      "url": "https://pubmed.ncbi.nlm.nih.gov/20498172/",
      "title": "Preventing Battery Ingestions: An Analysis of 8648 Cases",
      "publisher": "Pediatrics — Litovitz T, Whitaker N, Clark L, White NC, Marsolek M",
      "source_type": "peer_reviewed",
      "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.\"\n",
      "source_date": "2010-05-24",
      "source_accessed": "2026-04-11",
      "archive_url": "https://web.archive.org/web/20260413164200/https://pubmed.ncbi.nlm.nih.gov/20498172/",
      "calculation_notes": "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.\n",
      "independence_note": "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.\n"
    },
    {
      "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC5966199/",
      "title": "Button battery ingestion in children — a potentially catastrophic event of which all radiologists must be aware",
      "publisher": "Insights into Imaging — Pasternak et al.",
      "source_type": "peer_reviewed",
      "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.\"\n",
      "source_date": "2018-04-24",
      "source_accessed": "2026-04-11",
      "archive_url": "http://web.archive.org/web/20260420032638/https://pmc.ncbi.nlm.nih.gov/articles/PMC5966199/",
      "calculation_notes": "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.\n",
      "independence_note": "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.\n"
    },
    {
      "url": "https://www.cpsc.gov/Newsroom/News-Releases/2023/Making-Families-Safer-from-Button-Cell-or-Coin-Battery-Dangers-Reeses-Law-Leads-to-New-Federal-Mandatory-Safety-Standard",
      "title": "Making Families Safer from Button Cell or Coin Battery Dangers; Reese's Law Leads to New Federal Mandatory Safety Standard",
      "publisher": "US Consumer Product Safety Commission (CPSC)",
      "source_type": "govt_report",
      "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.\"\n",
      "source_date": "2023-09-20",
      "source_accessed": "2026-04-11",
      "archive_url": "https://web.archive.org/web/20260420032639/https://www.cpsc.gov/Newsroom/News-Releases/2023/Making-Families-Safer-from-Button-Cell-or-Coin-Battery-Dangers-Reeses-Law-Leads-to-New-Federal-Mandatory-Safety-Standard",
      "calculation_notes": "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.\n",
      "independence_note": "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.\n"
    }
  ],
  "comparison_anchors": [
    {
      "label": "Toddler food choking death, US child 0-4",
      "lifetime_us_adult": 0.00002
    },
    {
      "label": "SIDS, per US infant",
      "lifetime_us_adult": 0.00035
    },
    {
      "label": "Death in a plane crash, lifetime (US adult)",
      "lifetime_us_adult": 0.000017
    },
    {
      "label": "Death by lightning strike (lifetime, US)",
      "lifetime_us_adult": 0.00000354
    }
  ],
  "regional_breakdown": [
    {
      "region": "Severe injury (the headline), US child 0-6",
      "probability": 0.000004,
      "notes": "~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.\n"
    },
    {
      "region": "Any battery-related ED visit, US child 0-5",
      "probability": 0.0015,
      "notes": "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.\n"
    },
    {
      "region": "Fatal outcome only, US child 0-6",
      "probability": 7e-7,
      "notes": "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.\n"
    }
  ],
  "personal_factor_multipliers": [
    {
      "factor": "20mm+ lithium coin cell swallowed (CR2032 and similar)",
      "multiplier": 20,
      "notes": "The dominant severity driver. Litovitz et al. documented a 6.7-fold rise in major or fatal outcomes from 1985 to 2009 that tracked almost perfectly with the rise of 20mm+ lithium cells in consumer products. Pasternak and colleagues found that 12.6% of children under 6 who ingested a 20-25mm cell had a major complication or death, compared with a vanishingly small rate for smaller and older chemistries. The 20x multiplier is the rough ratio of severe-outcome rates between the 20mm+ lithium subset and the all-batteries average.\n"
    },
    {
      "factor": "ingestion >2 hours before treatment",
      "multiplier": 10,
      "notes": "Full-thickness esophageal burns and perforation can occur within roughly two hours of ingestion via electrolytic production of alkaline fluid where esophageal tissue bridges the anode and cathode. Cases reaching medical care inside the two-hour window have dramatically better outcomes than cases that present late. This is the reason poison control advises immediate hospital transport for any suspected ingestion and why misdiagnosis as a coin on radiography is so consequential.\n"
    },
    {
      "factor": "Reese's Law child-resistant packaging and secured compartments in use",
      "multiplier": 0.3,
      "notes": "Reese's Law (signed August 2022) and the CPSC's adoption of ANSI/UL 4200A-2023 require that button and coin batteries be sold in child-resistant packaging and that consumer products either require a tool or two independent simultaneous movements to open the battery compartment. The multiplier is qualitative — the law is too new for post-enforcement epidemiology — but earlier voluntary-standard periods in comparable foreign-body hazards suggest a 3-5x reduction for the compliant subset.\n"
    },
    {
      "factor": "age 1-3 (peak risk)",
      "multiplier": 2,
      "notes": "Jatana et al. reported a mean patient age of 3.2 years and an ED-visit rate roughly eleven times higher in children 0-5 than in 6-17. Within the 0-6 band, the 1-3 subset is over-represented among severe outcomes because that is when mouthing behavior and access-to-small-objects intersect.\n"
    }
  ],
  "short_label": "Button battery",
  "myth_framing": "underrated",
  "outcome_severity": "serious_harm",
  "exposure_pattern": "acute",
  "outcome_type": "serious_permanent_harm",
  "valence": "negative",
  "caveats": "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.\n",
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    "d6": 5,
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    "avg": 4.875,
    "scored_by": "claude-code-8d",
    "scored_at": "2026-05-25",
    "methodology_version": "1.2"
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  "reviewer": "likelier-phase-5-agent",
  "last_reviewed": "2026-04-11",
  "reviewed": true,
  "generated_at": "2026-04-11",
  "image": {
    "alt": "A single small round button-cell battery resting on a pale grey-blue surface, viewed from directly above, flat vector illustration."
  },
  "attribution": "Likelier — https://likelier.app",
  "license": "https://creativecommons.org/licenses/by-sa/4.0/",
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