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CR2032 batteries that are in airtags are NOT lithium-ion, they're non-rechargeable and are usually Lithium/Manganese Dioxide [1] (lithium metal). I believe they're fine to have in checked luggage if contained inside some equipment (like the airtag). [2] Look for PI 970 If transported by themselves, they're cargo aircraft only.

Source: [1] https://data.energizer.com/pdfs/cr2032.pdf [2] https://www.iata.org/contentassets/05e6d8742b0047259bf3a700b...

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The wording “containing lithium metal” from the ICAO regulation still applies.

That same org also explicitly calls out button cells are not being covered. They really aren't the same thing as a rechargeable lithium ion cell.

They're fine to have in checked luggage (under some restrictions). But the device containing them must be completely switched off, according to the rules. That is at issue here.

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