Air tag shows low battery after multiple replacements
I have replaced the battery in my AirTag three times and it will not clear the low battery warning from Find My. Is there a way to do this without removing and re-adding the device?
Question marked as
First are you sure you are using new fresh batteries? Second, did you check to see that the replacement batteries do NOT have a bitterant coating? Finally, are you the original owner of this AirTag?
If yes to all of these, then I suggest that you both "forget" it from your iPhone, and also reset it BEFORE trying to pair it again to your phone.
Ref: How to reset your AirTag - Apple Support