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Just the other day, my iPhone told me that the Apple AirTag that keeps me from losing my keys pretty much every day needed a new battery. I was away at the time (yeah, wouldn't that have been the perfect time to lose my keys) and so, unwisely chose to ignore it.
Luckily by then, I'd got hold of a replacement, but it still felt like a close one. I've grown reliant on AirTags to bring order into the chaos I create.
And even luckier for me, I knew where my keys were when it happened.
Apple says that AirTags have a battery lifespan of "more than a year" for everyday use, which is defined as "four play sound events and one Precision Finding event per day," so depending on your usage, you might get a lot more than a year, or a lot less than a year out of the battery in your AirTag.
I got a lot less than a year. I know, because I'd replaced the battery nine months ago.
Replacing AirTag batteries is easy -- I've covered the process here. All you need is a good quality CR2032 button cell – I recommend Energizer, Duracell, or the Amazon Basics brands.
However, be aware that if the replacement button cell has a bitter coating to prevent children from putting it in their mouths (button cells might seem innocuous, but they can cause serious injury or even death), you might have to remove some of that bitterant for the battery to work (I go through that process in detail here).