I can recommend rechargeable for the wallet based tags, but for coin/keytag style, go with cr2032.Wow! I didn't realise there were so many options.
Rechargeable would be best. Coin like the airtag - small and discreet. And ability to turn off and on the beeper 😂
They last forever, are dirt cheap, ubiquitous, and dont need to worry about keeping it topped off. it would be lame to not be able to track your stuff bc its dead.
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