Apple AirTag; Checking the Current Battery Level and Replacing a battery
In the fourth of his series of podcasts devoted to Apple's new AirTag Bluetooth Tracker, Thomas Domville demonstrates how to check the current battery level of an AirTag and shows us how to replace the battery.
Great podcast, as always. It sounds like you could get new batteries at the dollar store. As for the inaccessibility issue for checking the battery, My guess is that since it won't be needed for a year, maybe Apple figured they could work on that for future updates.