In a collaborative effort, Apple and Google have developed an industry-standard detection feature called “Detecting Unwanted Location Trackers” (DULT) for Bluetooth trackers. This standard allows users on iOS and Android devices to be alerted if an unknown Bluetooth tracker is monitoring their location.
No, both types are:
Since most people have no idea how many grams of lithium are in their lithium batteries, airlines just ban them from checked luggage outright.
It clearly says:
This is in general for carry-on and checked luggage. And then there’s the other paragraph about Lithium Ion batteries needing to go into the carry-on.