If a child swallows a button battery or two or more powerful rare-earth magnets, proceed immediately to an emergency department equipped for endoscopy: do not induce vomiting or wait for bowel passage

A button battery lodged in the esophagus can generate caustic electrical burns that cause irreversible necrosis within 2 hours, even while the child appears cheerful. Two or more swallowed rare-earth magnets attract each other across bowel loops, pinching tissue until the intestine perforates. If ingestion is even suspected, rush immediately to an emergency hospital for radiographic localization. Never induce vomiting, never wait for it to pass in stool, and never wait for symptoms to manifest.

Zero financial outlay for prevention; emergency diagnostic X-rays and endoscopic/surgical removal incur standard clinical hospital fees. At home, screw battery compartments tightly shut on TV remotes, electronic scales, key fobs, and children's toys, and lock spare coin batteries and neodymium magnetic spheres far out of reach. The difficulty is that button battery ingestions are unwitnessed in the majority of cases, and children often appear completely asymptomatic initially.

Data from the National Poison Data System spanning 1985 to 2009 showed a 6.7-fold increase in the percentage of button battery ingestions resulting in major injury or fatality. The greatest danger stems from 20 mm diameter lithium coin cells (such as CR2032). Children under age 4 swallowing >=20 mm cells experience disproportionately catastrophic clinical outcomes. Lodged in the esophagus, a battery generates an electrical current that hydrolyzes tissue fluids into concentrated sodium hydroxide, causing severe liquefaction necrosis with lifelong sequelae in as little as 2 to 2.5 hours. In fatal cases, 92% of ingestions were unwitnessed; among major injuries, 56% were unwitnessed. At least 54% of fatal cases and 27% of severe morbidity cases were initially misdiagnosed due to non-specific initial symptoms. Furthermore, injury progression continues deeply after battery extraction; esophageal perforation, tracheoesophageal fistula, aortoesophageal fistula, and fatal exsanguination have occurred days post-removal. In an analysis of 8,648 cases, 61.8% of batteries swallowed by children under 6 were extracted directly by the child from household battery-powered electronics. National Capital Poison Center guidelines instruct: if battery ingestion is suspected, "do not induce vomiting"; lodged batteries cause severe burns "in as little as 2 hours" and "do not wait for symptoms to develop." All patients under 12 years require immediate emergency X-ray imaging. Surveillance data from Guangdong CDC revealed nearly 100 pediatric battery ingestions over 5 years (92.9% involving children aged 0–6, with 39.3% sustaining moderate-to-severe injuries and 25.0% requiring inpatient hospitalization), mandating immediate emergency care and cautioning against home-induced emesis. When multiple neodymium magnet balls (e.g. Buckyballs) are swallowed, magnetic attraction clamps adjacent bowel segments, causing ischemia, bowel necrosis, intestinal obstruction, and perforation. A 2025 systematic review of 130 children who developed entero-enteric fistulas from multiple magnet ingestion found a median age of 3.3 years, with 95.5% requiring major surgical laparotomy, 19% developing postoperative complications, and 1 fatality.

Graded Evidence Grade B because findings derive from national poison control registries and case series rather than randomized controlled trials. Benefit is categorized as High because coin cells cause fatal esophageal erosion within 2 hours, and mortality is concentrated in unwitnessed and delayed-diagnosis cases. Beneficiaries are predominantly young children. When transporting the child, bring an identical battery sample, product packaging, or the opened device to assist emergency physicians in rapid radiographic size identification. Guidance regarding pre-hospital oral honey administration differs between jurisdictions: National Capital Poison Center suggests giving 10 mL of pure honey every 10 minutes (up to 6 doses) if the child is >=1 year old, ingestion occurred <12 hours prior, the child can swallow, and honey is immediately at hand, based on ex vivo porcine models demonstrating that honey buffers alkaline burns. However, human evidence remains limited, and infants <1 year must never receive honey due to infant botulism risks; Guangdong CDC recommends fasting and strictly avoiding oral fluids or emetics. Never delay hospital transit to search for honey. If a battery is ingested concurrently with a magnet, poison centers mandate urgent endoscopic removal even if it has reached the stomach. The elderly are also vulnerable: 15.5% of 8,648 recorded ingestions involved adults mistaking batteries (predominantly 36.3% hearing aid button cells) for oral prescription pills. For acute airway obstruction, see Chapter 13, Rule 26 (back blows and abdominal thrusts) or Rule 43 (infant choking). Ingestion of caustic household cleaning chemicals is covered in Chapter 13, Rule 20.

Litovitz T 等 (2010). Emerging battery-ingestion hazard: clinical implications. Pediatrics 125(6):1168-1177. https://doi.org/10.1542/peds.2009-3037；Litovitz T, Whitaker N, Clark L (2010). Preventing battery ingestions: an analysis of 8648 cases. Pediatrics 125(6):1178-1183. https://doi.org/10.1542/peds.2009-3038；National Capital Poison Center. National Battery Ingestion Hotline Guideline：「If battery ingestion is suspected: Do not induce vomiting」「Batteries lodged in the esophagus may cause serious burns in as little as 2 hours. Do not wait for symptoms to develop」. https://www.poison.org/battery/guideline；广东省疾病预防控制中心 (2025). 监测发现：这3种小物件易被孩子误吞，很多人家里都有，赶紧放好！. https://cdcp.gd.gov.cn/jkjy/jkzt/zlkz/content/post_4686546.html；Kelaidi N 等 (2025). Entero-Enteric Fistula Following Multiple Magnet Ingestion in Children: A Systematic Review. Journal of Clinical Medicine 14(17):6235. https://doi.org/10.3390/jcm14176235；Nugud AA 等 (2023). Pediatric Magnet Ingestion, Diagnosis, Management, and Prevention: A European Society for Paediatric Gastroenterology Hepatology and Nutrition (ESPGHAN) Position Paper. Journal of Pediatric Gastroenterology and Nutrition 76(4):523-532. https://doi.org/10.1097/MPG.0000000000003702；Anfang RR 等 (2019). pH-neutralizing esophageal irrigations as a novel mitigation strategy for button battery injury. Laryngoscope 129(1):49-57. https://doi.org/10.1002/lary.27312；Schmidt YM, Muensterer O, Wendling-Keim D (2023). The use of honey in button battery ingestions: a systematic review. Frontiers in Pediatrics 11:1259780. https://doi.org/10.3389/fped.2023.1259780