Check universal prohibitions, destination restrictions and service availability separately before using Japan Post international mail.[56][58][59] Qualifying lithium batteries must be installed in equipment and satisfy capacity, quantity, packaging and destination conditions; loose batteries and batteries merely packed beside equipment do not qualify.[57] Surface mail does not bypass the general dangerous-goods prohibition.[56]
Start with international postal rules, not domestic delivery experience
Japan Post distinguishes worldwide prohibitions from restrictions imposed by particular destination countries, and asks senders to check both.[56][58] Its international rules for alcohol and lithium batteries expressly differ from those for its domestic parcel service.[56] A separate availability chart shows whether particular services are being accepted for each destination, so an eligible object does not establish that its intended postal route is operating.[59]
Our advice: write down the destination, proposed service and complete contents before buying packaging. This article concerns international postal carriage from Japan, not goods carried into Japan by travellers or another courier's acceptance rules. The research date is 2026-09-21, not a claimed publication or commencement date for every rule. A shop purchase, airline permission or hotel forwarding arrangement is not evidence of postal eligibility.
Surface mail is not a dangerous-goods workaround
Japan Post says goods covered by air-transport dangerous-goods regulations cannot be sent internationally regardless of mail type or transportation method, explicitly including sea mail.[56] Its examples include matches, lighters, portable-stove gas and certain compressed-gas sprays; qualifying lithium batteries installed in equipment have a separately documented exception.[56][57] Choosing a slower route therefore does not itself make an otherwise prohibited dangerous item acceptable.[56]
Our advice: inspect individual travel products rather than describing the whole box as personal belongings. Pay particular attention to fuel, gas containers, ignition products and electronics. For an uncertain product, take its model, ingredients, packaging label and intended use to the post office before sealing the box. This article does not classify every liquid or cosmetic as prohibited; neither a small container nor unopened retail packaging resolves a classification question.
Installed means installed, not packed alongside
The battery guidance requires installation in, or integration into, equipment and excludes both batteries sent alone and batteries packed with equipment without being installed, even when other conditions are satisfied.[57] Removing a camera battery and placing it beside the camera does not meet that installation requirement.[57] Installation is only one condition: capacity, quantity, packaging and destination restrictions remain applicable.[57]
Our advice: list spare batteries separately from installed ones and do not hide them in accessory pouches or modify products to manufacture apparent eligibility. Do not assume a power bank qualifies as a phone-like device merely because its cells sit inside a casing; describe its purpose explicitly when asking the post office. Japan Post separately explains that button-type lithium batteries installed in equipment are outside the air dangerous-goods category, but that wording should not be extended to loose button batteries.[57]
Check cells, battery packs and capacity separately
For the generally rechargeable lithium category, the official table permits no more than 20 watt-hours per cell or 100 watt-hours per assembled battery, with the assembled battery's watt-hour rating indicated on its exterior container.[57] For generally non-rechargeable lithium metal or alloy batteries, the lithium-content limits are one gram per cell and two grams per assembled battery.[57] One international mail item may contain up to four lithium cells or two assembled batteries; this is not a blanket allowance for four electronic devices.[57]
Our advice: use manufacturer specifications to identify the actual battery structure and rating. A phone, camera or laptop is a device description, not a battery classification. For mixed configurations, multiple internal batteries or unclear labels, ask the post office to assess the complete list rather than adding the two quantity limits together yourself. Passing the quantity test does not waive the other requirements.[57]
Battery condition and protective packaging still matter
Japan Post requires protection against damage and short circuits, effective measures against accidental activation, and compliance with its referenced packing standards.[57] Batteries must also meet the specified United Nations testing requirements, must not be identified by their manufacturer as defective for safety reasons, must not be damaged or liable to dangerous heating, fire or short circuits, and must not exceed the stated five-kilogram battery-weight limit.[57] A device with a damaged battery therefore cannot qualify merely because its watt-hour rating is small.[57]
Our advice: inspect the equipment and prepare packaging that secures it and prevents its switch from being pressed, then confirm the arrangement with the post office. Do not dismantle an integrated battery that cannot safely be removed or assume an unidentified replacement battery has passed the required tests. This article is not a dangerous-goods packing certification; unresolved safety or packaging questions should stop the posting process.
Destination eligibility and service availability are different checks
The lithium guidance requires a permitted destination and distinguishes air-service destinations from surface-mail destinations; its destination table is marked as of August 22, 2025.[57] It warns that even listed destinations may return items because of newer local regulations, and some electrical appliances face additional restrictions.[57] The separate international service chart distinguishes acceptance, partial acceptance, non-acceptance and no service, making operational availability a further check rather than a substitute for battery eligibility.[59]
Our advice: do not turn a country name in the older battery table into an unconditional shipping promise on 2026-09-21. On posting day, check the battery destination conditions, destination-specific restrictions and the chosen service together. Follow explanatory notes for partial acceptance instead of reading only the symbol. This article deliberately makes no country-by-country promise: local requirements and postal operations can change independently, and an older downloaded table cannot settle both questions.
Counter acceptance is not the end of screening
Japan Post says accepted international mail undergoes X-ray inspection and may be returned before leaving Japan if it contains a nonmailable article.[56] Its destination-restriction page requires advance checks of country-specific prohibitions and says handwritten labels can no longer be used when sending goods.[58] Paying postage or handing over a parcel therefore does not mean subsequent screening is complete or that destination restrictions have ceased to apply.[56][58]
Our advice: make one final inventory covering product names, battery installation, cell or assembled-battery classification, ratings, quantities, protective packaging and service status. Resolve uncertain classifications before preparing the required label, and keep the declaration consistent with the actual contents. Leave time to reopen packaging or arrange another disposition for objects that cannot be mailed. Do not rely on an international parcel as a guaranteed last-minute way to empty luggage before a flight. This article promises neither delivery times nor refund or compensation outcomes.
Before departure
- Check universal prohibitions, destination restrictions and service availability separately.[56][58][59]
- Surface mail does not bypass the general air dangerous-goods prohibition.[56]
- Install qualifying batteries in equipment; loose or merely accompanying batteries do not qualify.[57]
- Confirm cell or assembled-battery classification, capacity and total quantity per mail item.[57]
- Check short-circuit protection, accidental activation, damage and safety-defect conditions.[57]
- Our advice: ask the post office about unclear specifications instead of assuming acceptance.
Sources & freshness
Sources accessed 21 September 2026. Numbers identify sourced facts; unnumbered planning steps are editorial advice, not operator promises. Recheck prices, availability, sales rules and operating status before travelling.
- [56] Nonmailable Articles in International Mail ↗
Japan Post · Source publication date: not stated · Accessed: 2026-09-21
- [57] Conditions for sending lithium batteries by international mail ↗
Japan Post · Source publication date: not stated · Accessed: 2026-09-21
- [58] Items that cannot be sent depending on the destination country ↗
Japan Post · Source publication date: not stated · Accessed: 2026-09-21
- [59] International mail service availability chart ↗
Japan Post · Source publication date: not stated · Accessed: 2026-09-21
Applies to: Japan; specific services and routes are defined in the article. Source publication dates and exact scope are stated in the article; an undated page is not a permanent guarantee. Article published and sources verified: 2026-09-21. Service effective dates are not page publication dates.
How we research and update