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Power banks on flights to Japan: the 2026 rule

2 packs

Japan's aviation regulator rewrote the power-bank rule in April 2026, and the change is the kind that costs you a power bank at the gate rather than at security.

Shape Two packs, 160 Wh each at most, in the cabin, off the aircraft's own socket and not charging anything during the flight. The hold is out, and so is the overhead bin.
Packs per passenger
2
Maximum rating
160 Wh
In force since
24 Apr 2026

1What changed on 24 April 2026

The rule that governs your carry-on now is the one Japan's Ministry of Land, Infrastructure, Transport and Tourism published in April 2026, after the ICAO Council approved an emergency amendment to the international standard on 27 March 2026. Three things moved at once: a hard cap of two power banks per passenger in the cabin, a ban on charging the power bank itself from the aircraft's seat power, and a ban on charging a phone or anything else from the power bank while you're on board.

Until that date a power bank was treated as an ordinary spare lithium battery: allowed in the cabin without a quantity limit, so long as it was under 160 Wh. But it's now a separately regulated item with its own count.

2The numbers, and where each one applies

RuleThe 2026 figureWhere it bites
Power banks per passenger2, each rated 160 Wh or lessThe cabin only; anything above 160 Wh is refused outright
Checked baggageProhibitedPack them in the carry-on, never in the bag you check in
Spare camera and laptop batteries100 Wh or less, no quantity limitUnchanged by the April 2026 rule, which is about power banks
Where to keep them on boardSeat pocket, not the overhead compartmentThe crew has to be able to reach it if it starts to heat
Terminals and protectionEach pack individually short-circuit protectedTape the contacts or keep it in a case, and no loose metal in the same pocket

3Charging in the air, which is the part people miss

From 24 April 2026 you may not use a power bank to charge a phone in the cabin, and you may not plug a power bank into the seat's own power outlet to top the power bank up. Bring a charged phone and use the aircraft's socket for the phone itself. It's the reverse of the habit most people have, and it's the single change most likely to be enforced by cabin crew mid-flight.

4Who applies it, and the likely 2027 change

The rule isn't a scheme that each airline opts into: Japan's Scheduled Airlines Association, whose members include JAL and ANA, applied it uniformly across its member carriers, so the two-pack cap applies whatever you fly. Violating the hold ban, the 160 Wh ceiling, the storage rule, the two-pack limit or the charging bans can be penalised under Japanese aviation law.

Both large Japanese carriers also warn that the limit may fall to 100 Wh from January 2027 if the expected IATA change lands, so a 150 Wh pack bought this year may not fly next year.

5What I would do

One 10,000 mAh power bank in the carry-on, charged before boarding, contacts taped. If you're travelling as a pair and both of you carry a bank, you have four between you, which is more than enough for two phones over a 14-hour pair of flights. Put it in the seat pocket at boarding, because the overhead bin is the one place the rule says it may not go.

Sources

  • MLIT (Ministry of Land, Infrastructure, Transport and Tourism) — the April 2026 press release on the new power-bank cabin rules (mlit.go.jp/report/press/kouku10_hh_000310.html)
  • MLIT / JCAB — the restricted-items notice: the two-pack limit, the 160 Wh ceiling, cabin-only carriage, the seat-pocket storage rule and the charging prohibitions (mlit.go.jp/koku/content/001998101.pdf)
  • ICAO — the emergency amendment to the international standard on power banks, approved 27 March 2026
  • 定期航空協会 (Scheduled Airlines Association) — uniform application across its 19 member airlines (teikokyo.gr.jp)
  • JAL — the advisory that the 100 Wh threshold may apply from January 2027 (jal.co.jp)

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