After activating a brand-new AirTag, you can expect to replace that first battery in about a year. The timing of subsequent replacements really depends on the quality of the batteries you purchase, as well as how much you use the tracker.
Most lithium CR2032 coin batteries will work just fine. A four-pack of the batteries costs around $6 on Amazon. Just know that some of these CR2032 batteries have been treated with a bitter coating to discourage children from swallowing them.
Removing the old battery and adding in the fresh one is simple. Flip the AirTag so the silver side with the Apple logo is facing you. Use your fingertips to press down and rotate the silver piece about a quarter turn counterclockwise.
The coated batteries that do work will clearly say 'Compatible With Apple AirTag' on the package, so if yours has this coating, make sure to double-check the packaging.
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