> AirTag is designed for over a year’s worth of battery life with everyday use. The CR2032 battery is user-replaceable and widely available. Replacement batteries are sold separately. That's the piece of information I wanted to know first. Devices like this can be built, but those can't run on batteries for a reasonable time frame. Apple made it practical.
This device will be used like find my phone - a removable battery will make it trivial for thieves to disable the tracking.