Great question — answering as the UphillTech team:
In the USA, the https://www.ecfr.gov/current/title-49/subtitle-B/chapter-I/subchapter-C/part-175 defines such regulations. Summary, from this PDF ( mirror , more details ): More details from §175.10: Lithium content ≤ 2 g: installed device may go in checked or carry-on baggage. In checked baggage it must be completely powered off (not sleep/hibernation) and protected from accidental activation and damage. Lithium content ≤ 0.3 g: exempt even from the power-off requirement. Lithium content > 2 g, up to 8 g: only permitted if the device is a portable medical electronic device and the airline has approved it in advance. Two spares in that range are similarly allowed only with approval. Spare...
Full answer by Franck Dernoncourt: https://travel.stackexchange.com/a/204499 (CC BY-SA 4.0).
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