The Apple AirTag uses a CR2032 lithium 3V coin battery. This type of battery is chosen for its long-lasting lithium chemistry and ability to operate in extreme temperatures. When replacing the battery, it is important to insert it with the positive side facing up. Additionally, Apple recommends using CR2032 batteries without bitterant coatings, as some coatings might interfere with the battery's contact and prevent it from working properly with the AirTag. The battery typically lasts about 12 to 18 months depending on use.
