Japan’s Ministry of Land, Infrastructure, Transport and Tourism (MLIT) signalled stricter cabin rules for portable power banks following international lithium-battery incidents. Japan Airlines (JAL) published a passenger notice describing scheduled changes from mid-April 2026: a limit on how many power banks each passenger may bring, a per-unit watt-hour ceiling, and prohibitions on using aircraft power to recharge power banks or using power banks to charge other devices during the flight. Other Japanese carriers typically align with MLIT guidance — confirm on your airline before travel.
Reported requirements (check JAL’s page for final wording)
- Quantity — Up to two power banks per passenger (as communicated for the mid-April 2026 rollout).
- Energy per unit — Each power bank is typically limited to 160 Wh or less (confirm on JAL’s official notice in case of updates).
- Onboard behaviour — Do not charge a power bank from the aircraft’s outlets or USB, and do not use a power bank to charge phones, tablets, or other devices while on board, per JAL’s 2026 advisory.
- Carry-on — Power banks remain spare lithium batteries: keep them in hand baggage, never in checked luggage.
Planning a trip to or from Japan
If you connect on JAL, ANA, or a regional Japanese carrier, read the English dangerous-goods or battery page for your operating airline the week of travel. MLIT-driven updates can roll out on slightly different dates per carrier.
At the airport: what to expect
Japanese airports are strict about readable labels and cabin-only carriage for spare lithium batteries. Arrive with your power bank in a top pocket of your cabin bag, Wh or mAh visible, and avoid packing spare cells deep inside a cluttered backpack. If you transfer from an international flight onto a domestic Japanese segment, re-read the operating carrier’s English battery page — some notices apply only to certain route types or effective dates.
If security asks you to demonstrate the printed Wh value, show the physical label rather than a screenshot. Keep a photo backup on your phone anyway, in case the label is worn.
Cabin bans on charging differ from carriage bans: you may still be allowed to bring the device while being asked not to use it. Listen for bilingual announcements (Japanese and English) on major carriers; regional props may only announce in Japanese, so watch cabin crew demonstrations if you do not speak the language.
Sources below include JAL’s scheduled change notice and the IATA passenger lithium summary for cross-checking Wh limits when MLIT and airline notices focus on usage rather than capacity.
Travellers with mobility devices should carry airline letters for any large spare packs; Japanese security may otherwise assume consumer limits apply. Keep Japanese-language PDFs from your carrier on your phone for faster resolution if English signage lags behind policy updates.