How to remove and replace the battery in your AirTag — Apple Support

To remove and replace the battery in your AirTag, start by holding the AirTag with the polished stainless steel battery cover facing you. Press down on the cover and rotate it counterclockwise until it stops, then release your fingers to allow the cover to pop up. Remove the old battery and insert a new one, ensuring the positive side faces you. Note that batteries with a bitter coating may not work with AirTag, and keep batteries away from children. To reattach the cover, align the three tabs with the slots on the AirTag, press down, and rotate clockwise until it stops. Your AirTag will chime to indicate the battery is connected.

Summary:
– Hold the AirTag with the polished stainless steel cover facing you.
– Press down and rotate the battery cover counterclockwise to open it.
– Remove the old battery and insert a new one with the positive side facing you, keeping batteries away from children.
– To reattach, align the cover tabs with the slots on the AirTag, press down, and rotate clockwise until secure.
– A chime will sound to confirm the battery is properly connected.