A failing CMOS battery, typically a CR2032 or CR2025 coin cell, loses its ability to keep a motherboard's clock and BIOS/UEFI settings intact when the system is unplugged. Symptoms include the date resetting to a default like January 1, 2000, boot-time warnings, and BIOS settings such as boot order reverting to factory defaults. Replacing the battery is cheap and simple, and using sleep mode instead of rebooting can temporarily preserve settings on a dead battery.
engadget.com
· 2026-10-26
AirTags use a standard CR2032 coin cell battery that typically lasts a year or more, though heavy use of features can shorten that to a few months. Users can check battery status via the Items tab in Find My, which shows an orange icon only when a replacement is needed. Replacing the battery involves twisting off the steel back cover and swapping in a new cell with the positive side up.
engadget.com
· 2026-10-24
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.
engadget.com
· 2026-10-24
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