Battery ingestion is a time-critical pediatric emergency, particularly when a button battery becomes lodged in the esophagus. Although many ingested batteries pass uneventfully through the gastrointestinal tract, esophageal impaction can cause severe caustic injury within hours and may lead to perforation, fistulization, hemorrhage, and death. A practical clinical framework should therefore distinguish between button batteries (coin/disk cells) and cylindrical batteries (e.g., AA/AAA types), because their injury profiles and management pathways differ.1-3

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As defined by current clinical surveillance, button batteries (also known as coin or disk batteries) are characterized by:4

• Dimensions: Typically, 5-25 mm in diameter and 1-6 mm in height. The 20 mm diameter lithium cell is the most significant driver of severe morbidity due to its propensity for esophageal impaction.

• Chemistry: Formulations include lithium, silver, zinc, and heavy metals such as nickel, cadmium, and mercury.

• Caustic Electrolytes: High concentrations of potassium hydroxide or sodium hydroxide.

 

Epidemiology and demographics

Across contemporary datasets, young children—especially those under 6 years of age—are the highest-risk group. In the Canadian poison-center analysis, 62% of Canadian Surveillance System for Poison Information (CSSPI) system cases and 69% of British Columbia Drug and Poison Information Centre (DPIC) cases occurred in children under 6 years; in the Dutch national pediatric surveillance study, the median age was 2.8 years, and the population-related incidence was 1.18 per 100,000 children per year. In the Lisbon tertiary-center pediatric series, the median age was 26 months, reinforcing the observation that the most serious cases cluster in toddlers.2,3,5

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Male predominance is slight and inconsistent across datasets, so it is more accurate to state that the sex distribution is roughly balanced, with a small male excess in some cohorts, rather than overinterpreting it. In addition, the Canadian surveillance paper identified a meaningful secondary risk group among adults older than 59 years, often involving hearing-aid batteries mistaken for pills. The same paper also showed that poison-center data are useful for surveillance but likely underestimate true clinical burden and long-term complications, so those rates should not be presented as definitive population incidence without qualification.3

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A cautious summary of exposure source is that most pediatric ingestions occur in household settings, commonly involving batteries from consumer products such as hearing aids, toys, watches, flashlights, and other small electronic devices.3,6

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Pathophysiology and mechanisms of Injury

The dominant mechanism of severe esophageal injury is electrolyte-mediated tissue injury, not simple leakage alone. When a button battery contacts esophageal mucosa, the tissue completes an electrical circuit, generating hydroxide ions at the negative pole and rapidly creating a highly alkaline environment that causes liquefactive necrosis. Pressure necrosis and leakage of alkaline contents may contribute, but electrolysis is considered the principal driver of injury. It is a dangerous misconception that "spent" or "dead" batteries are safe. Even batteries that no longer power a device retain sufficient residual voltage to drive the 2nd-order hydrolysis reactions required for full-thickness burns.1,7

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Mucosal injury may begin within 15 minutes, and severe injury can develop within 2 hours; therefore, esophageal impaction is treated as an emergency. The most severe injuries are associated with larger (especially ≥20 mm) 3-V lithium button batteries, particularly in small children, because these cells are both more likely to lodge and to generate rapid alkaline injury. Crucially, while destruction is rapid, the clinical diagnosis of perforation is often delayed; evidence suggests perforation is rarely diagnosed within the first 12 hours, creating a period of deceptive clinical stability that must not lead to complacency.1,2,6

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By contrast, ingestion of cylindrical batteries is usually low risk and often amenable to conservative management, but it is not benign in all cases. In the 2025 pediatric cylindrical battery series, conservative management was appropriate for most children. However, the authors specifically advised timely removal when the battery is A23 or A27 type, damaged, retained, or associated with symptoms, multiple ingestion, or prior abdominal surgery.8

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Clinical presentation: witnessed vs unwitnessed ingestion

Clinical presentation is often nonspecific, and unwitnessed ingestion is especially dangerous because diagnosis is delayed until complications develop. Acute presentations of witnessed ingestion are more likely to include vomiting, drooling, dysphagia, irritability, coughing, stridor, and respiratory distress. In contrast, delayed presentations may include fever, refusal to feed, hematemesis, melena, neck pain/stiffness, cough, hoarseness, or sudden hemorrhage.1,2

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One useful data point from the Lisbon tertiary-center series is that symptoms were present in 100% of esophageal battery cases but only 24% of gastric battery cases. This is a good teaching point, but it should be identified as a single-center observational finding rather than a universal rule.2

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A key red flag is mid-esophageal impaction, which carries the greatest concern for aortoesophageal fistula (AEF) because of proximity to the aorta. Hematemesis or melena in this setting should be treated as a warning sign of advanced injury and possible vascular involvement.1

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Diagnostic imaging

Any suspected battery ingestion requires urgent radiographic evaluation, ideally with two views (Ateroposterior and lateral), including the entire neck, chest, and abdomen. On AP view, clinicians should look for the double-ring / halo sign, representing the battery’s two-layer construction; on lateral view, they should assess for the step-off sign, which helps distinguish a button battery from a coin and identifies the negative pole orientation.1,9

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Advanced imaging is indicated when there is concern for complications. Computed Tomography (CT) or Magnetic-Resonance Imaging (MRI) after battery removal is recommended when there are severe symptoms, evidence of mucosal injury, suspected perforation/fistulization, or delayed diagnosis (e.g., first confirmation or removal more than 12 hours after ingestion), because cross-sectional imaging helps assess mediastinal injury and proximity to major vessels.1

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Emergency intervention and management timeframes

Management is highly time-sensitive. If ingestion is suspected, immediate two-view X-rays should be obtained. If the child is 12 months or older, the ingestion was likely within 12 hours, the child is stable and able to swallow, and perforation is not suspected, it is reasonable to administer 10 mL (2 teaspoons) of honey every 10 minutes for up to 6 doses en route to endoscopy. In a clinical setting, sucralfate suspension 1 g/10 mL may also be given as 10 mL every 10 minutes for up to 3 doses. These measures may reduce injury severity, but must never delay endoscopic removal.1,9,10

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If a button battery is in the esophagus, immediate endoscopic removal is mandatory, ideally within 2 hours. The intervention should not be delayed for fasting status. Endoscopic inspection should document injury depth, location, and battery orientation, because these features guide risk stratification for airway and vascular complications.1,2,9

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For batteries beyond the esophagus, management is more selective. In asymptomatic children, observation is often appropriate. However, retrieval should be considered if symptoms develop, if a magnet was co-ingested, or if a large battery persists in the stomach, especially in younger children. The National Capital Poison Center uses age- and size-based thresholds (for example, persistent ≥15 mm gastric batteries in children <6 years), whereas ESPGHAN allows observation in many asymptomatic cases with follow-up imaging; this should be presented as a guideline-dependent decision, not a single universal rule.1,9

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After removal, if there is no perforation, the injured area may be irrigated endoscopically with 50–150 mL of 0.25% sterile acetic acid. This is a reasonable mitigation strategy, but the evidence base is limited and largely derived from animal/preclinical work and a very small pediatric series, so it should be described as an adjunct rather than a fully established standard.1,9,11

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Clinical outcomes and complications

The most serious injuries are associated with esophageal impaction. In the Lisbon series, all patients with esophageal batteries had severe mucosal injury, acute complications occurred in more than half, and later stenosis was common. Severe tissue injury can occur within hours, but frank perforation is usually identified within 2 days, not necessarily within the first 2 hours.1,2

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Important complications include esophageal perforation, mediastinitis, tracheoesophageal fistula, recurrent laryngeal nerve injury/vocal cord paralysis, esophageal stricture, and aortoesophageal fistula. Delayed catastrophic bleeding remains a central concern: ESPGHAN notes that fistulas can present up to 4 weeks after removal, and the poison-center guideline reports that esophageal-vascular fistulas may present up to 27 days after removal. This justifies prolonged clinical vigilance, especially after mid-esophageal injury or any sentinel bleeding.1,5,9,12