Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Just had a notification ping up on my phone that one of my batteries is low in one of my AirTags and needs replacing so I’ve replaced it.
For my other three airtags, one is at approx 25% battery life, one is at 70% and the third still seems to be around 90%. It will be interesting to see if the airtag that I’ve just replaced the battery for depletes at the same rate as the previous battery
 
Just to update this. Swapped over the defective AirTag at the Apple Store yesterday, fairly painless - although obviously helped by the fact that this was still in standard 12 month warranty.

Keep an eye on those batteries, peeps! If one is discharging batteries faster than the others, then do be mindful of repeatedly swapping out batteries rather than raising it with Apple before your warranty elapses.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.