Airline check-in luggage rules are such nonsense. Li-ion batteries are not allowed (short-circuit risk?), but devices containing Li-ion batteries are, but then mobile "batteries" aren't (but they're a power supply device, not a battery?), but a combo BT speaker+battery is OK.
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I believe the underlying check-in rule is "does this have exposed contacts on it anywhere?" and even then if you cover them appropriately it's OK. I vaguely recall reading about it somewhere in ICAO regs.
ANA made me take out two little portable USB mobile batteries from my check-in sometime this year (they pulled my suitcase out to the gate and called me to go through and take them out!). I was confused because to me they aren't "batteries" per se. Protected & only USB A exposed.
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It doesn't make much sense but this seems to match up with what the FAA says: https://www.faa.gov/about/office_org/headquarters_offices/ash/ash_programs/hazmat/passenger_info/media/Airline_passengers_and_batteries.pdf … "Spare lithium metal and lithium ion/polymer batteries are prohibited in checked baggage—this includes external battery packs"
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My guess is they either can't easily distinguish bare LiPos from those with USB circuitry, or they don't want to rely on airline employees determining if an external battery pack is safe or not
End of conversation
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