GoKawiilGuide outlines methods to test CR2032 coin-cell batteries at home
A new guide explains several ways to check whether a CR2032 coin-cell battery still works, including dedicated coin-cell testers, basic multimeters, and a simple LED test where touching the LED's legs to the battery's terminals shows whether it can supply current. It also notes that AirTag and SmartTag2 users can check battery status directly through their companion apps before opening the device.