“…Batteries may cause injury by several mechanisms: 1) electrical discharge with hydrolysis and the creation of hydroxide ions in adjacent tissues causing mucosal burns, 2) necrosis due to direct pressure, 3) caustic injury due to alkalis (sodium or potassium hydroxide), and 4) mercury toxicity [26,27]. Esophageal necrosis, perforation, and death have been reported after button battery ingestion [17,26,28]. Although a large study found that mercury toxicity is rare [29], some batteries contain 5 g of mercuric oxide, which is a lethal dose.…”