Why is Japan banning power-bank use on planes?

Safety concern and the rule's scope

Japanese authorities are moving to ban the use of portable power banks on domestic flights, citing fire-safety risks associated with lithium-ion battery devices in the cabin. The decision follows mounting concerns about battery fires in confined aircraft spaces and reflects a cautious regulatory approach to prevent incidents that could endanger passengers or force emergency returns.

Reports describe the measure as a prohibition on using power banks in flight on domestic Japanese carriers. Details about whether the rule also forbids carrying power banks in hand luggage, or requires specific packing or declared capacity limits, remain unclear. Travelers bound for or within Japan should treat the situation as evolving and expect individual airlines to publish clarifying guidance.

How travelers should prepare

• Check your airline’s official notice before travel; domestic Japanese carriers will post the definitive operational rules.
• If you rely on external battery packs, plan alternatives:
• Bring devices with full charges and use battery-saver modes.
• Use airport charging stations before boarding.
• Purchase approved battery packs locally if allowed and needed for onward travel.
• Keep power banks in your carry-on unless an airline explicitly permits otherwise; many jurisdictions already prohibit them in checked baggage.

Until carriers and regulators publish full guidance, err on the side of caution: assume restrictions may affect in-flight charging and pack accordingly. If you have a critical medical device that requires external power, contact your airline in advance to arrange an accommodation.