Yep, lithium ion battery pack.
Do you need a plane adapter still these days?
generally no. My last flight on a Etihad 380 had a weird magnetic connector but still had the 2 standard 3.5mm plugs, just plug into one of those. The BOSE probably has one in the pack though. Dunno if the 2 prong adapters do anything?
@TRA started
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Yep, lithium ion battery pack.
Do you need a plane adapter still these days?