The AirTag uses a standard coin-shaped CR2032 battery, which is designed to last at least a year before needing to be replaced. To replace the battery, follow these steps:

1. Press down on the polished stainless steel battery cover of your AirTag and rotate counterclockwise until the cover stops rotating.
2. Remove the cover and battery.
3. Insert a new CR2032 lithium 3V coin battery (available at most electronic and drug stores) with the positive side facing up. Youll hear a sound indicating that the battery is connected.
4. Replace the cover, making sure that the three tabs on the cover align with the three slots on the AirTag. Rotate the cover clockwise until it stops.

It is important to note that CR2032 batteries with bitterant coatings might not work with AirTag or other battery-powered products, depending on the alignment of the coating in relation to the battery contacts. Therefore, it is recommended to use a brand known to be compatible and avoid batteries with a bitter coating. Additionally, some users have reported that using a generic or low-quality battery may result in a shorter battery life.