How do you know that they won't shrink it to a dime size??
It would have to be larger than a dime. A classic 'if this, then that' case:
There are also strings that suggest Apple's tags will be equipped with a removable battery, which would likely be a button cell, aka the small, circular batteries found in many watches and the latest Tile trackers. A low battery warning appears to prompt the tag to send a final location of the item it is attached to.
"Unscrew the back of the item and remove the battery," another string in the internal Find My app bundle reads.
If they take a removable 2016 or 2032 button battery, which is already larger than a dime...
(and other button cells are much thicker)
You can guess the rest.
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Hint: Look at the TrackR Pixel. I have a ton of those, and that's about as small as you can make a device like that - and I imagine Apple is simply going to pick up where TrackR left off.
Two pains in the rear because they're Bluetooth. Walk away and the TrackR already does what Apple's rumored device will do, only if you A, have the app running or B, launch the app to find a device and are surprised to find the battery you replaced last month is dead. The little batteries get costly because a lost / home / away-from-you device is constantly getting Bluetooth pings from other near devices to prove it knows where it is. Hopefully Apple can improve upon that.

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