Those tiny batteries used in hering aids calculators cameras and watches can pose a danger to delicate ear and nasal tissues and should be kept out of reach of children according to Dr.Joseph M. Capo and Frank E. Lucente of the New York Eye and Ear Infirmary.
The mini-batteries are considerably more dangerous than most objects young children put into their noses or ears such as small plastic toys or rubber erasers Batteries rapidly destroy the tissues because moisture in the nose or ear canal may erode the metal casing This allows caustic materials to leak or generates an electrical current through body tissues