The most common technical frustration reported across hardware support forums involves fresh batteries that fail to emit the startup chime. Users assume their tracker suffered water damage or internal logic board failure. In reality, the culprit is child protection chemistry.
To discourage toddlers from swallowing dangerous button cells, manufacturers such as Duracell coat their packaging lines with a non-toxic bitter compound known as Bitrex (denatonium benzoate). This bitter coating issue creates an invisible, non-conductive film over the negative ring and outer edges of the coin cell. Because Apple engineered the AirTag's battery terminal clips with extremely low contact surface area, this film acts as an electrical insulator.
If you insert a coated cell, current cannot jump the terminal gap. You can bypass this obstacle by purchasing uncoated batteries from brands like Energizer, Panasonic, or Sony. Alternatively, if you already have bitterant-coated cells on hand, rubbing the battery casing vigorously with a cotton swab soaked in 90% isopropyl alcohol dissolves the chemical layer and restores standard conductivity.
