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.
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 ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results