It turns out I was right about AirTags using a CR2032 battery, also known as a “watch battery”. It makes sense though. I’d bet that Apple will release a new version next year that is MagSafe compatible and charge way more money for it. 
Apple somehow manages to sell people on the smallest of upgrades, so yeah, probably. 
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What I was trying to say was: who would consider that an upgrade?
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