You 2 are talking around each other. You're probably both right about 2 different technologies. Lithium ions are rechargeable batteries; lithium primaries are

You 2 are talking around each other. You're probably both right about 2 different technologies. Lithium ions are rechargeable batteries; lithium primaries are non rechargeable, high performance batteries. Apple air tags use lithium primaries, but I suspect airlines do not care and both kinds are banned (from loaded-in-device-in-baggage flight).