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.
- 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
| Rule | The 2026 figure | Where it bites |
|---|---|---|
| Power banks per passenger | 2, each rated 160 Wh or less | The cabin only; anything above 160 Wh is refused outright |
| Checked baggage | Prohibited | Pack them in the carry-on, never in the bag you check in |
| Spare camera and laptop batteries | 100 Wh or less, no quantity limit | Unchanged by the April 2026 rule, which is about power banks |
| Where to keep them on board | Seat pocket, not the overhead compartment | The crew has to be able to reach it if it starts to heat |
| Terminals and protection | Each pack individually short-circuit protected | Tape 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.
Keep reading
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)

