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A comment on Ask HN: Who is building credit card size tracker using U1 spec?. Parent comment

Re:Ask HN: Who is building credit card size tracker using U1... by lukeboi on Monday September 12, 2022 @12:04PM (#32812371)
Normal airtags don't use rechargable lipos - they use a CR2032 coin cell battery
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Re:Ask HN: Who is building credit card size tracker using U1... by kube-system on Monday September 12, 2022 @12:38PM (#32812855)
I know. I am entertaining the OP's exercise in how one might make a thinner device. CR2032s are more than 4 times as thick as a credit card, even without a socket or a housing.

The thinnest commonly available coin cells are 1.2mm thick, which is better, but still will require a creative interpretation of "credit card size".

An ISO credit card is 0.76mm thick.

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