To replace an AirTag battery, you'll need a new CR2032 3-volt lithium battery, and it helps to have a pair of rubber gloves.

Apple AirTag batteries are designed to last up to a year under normal conditions, but factors like frequent location pings ...

If you need to replace the battery inside an AirTag, Apple is warning against using a replacement CR2032 coin battery with a bitterant coating because there's a chance it won't work. Coin batteries ...