Yes. A lithium-ion power bank needs both, because they cover different risks checked by different parties. PSE (電気用品安全法, the Electrical Appliance and Safety Act, DENAN Act) governs whether the product may be placed on the Japan market as a consumer good. UN38.3 testing governs whether the cells inside it may be loaded onto an aircraft or vessel in the first place. One without the other leaves a real gap.
Why Does a Power Bank Need Two Separate Certifications?#
Because PSE and UN38.3 answer different questions asked by different authorities. PSE is a product-safety regime under the Electrical Appliance and Safety Act (電気用品安全法), enforced by Japan's Ministry of Economy, Trade and Industry (METI), and it asks whether the finished product is safe to sell to a Japanese consumer. UN38.3 is a transport-classification test series from the UN Manual of Tests and Criteria, applied under IATA rules for air freight and IMDG rules for sea freight, and it asks whether the cell or battery inside the product is safe to carry as cargo.
A shipment can pass one and fail the other. A battery that has passed every UN38.3 test (altitude simulation, thermal cycling, vibration, shock, short circuit, crush, overcharge and forced discharge) can still be sold in Japan without a valid PSE registration, and conversely a PSE-registered power bank cannot move by air or sea at all if the underlying cell has no UN38.3 test summary on file. Aplash structures these as two parallel workstreams rather than sequencing one after the other, because the carrier booking and the Japan market-entry filing run on independent timelines. For the certification-per-model mechanics on the PSE side, see the PSE certificate per product model guide.
What PSE Category Does a Power Bank Fall Under?#
A standalone consumer power bank falls under the mobile/portable battery category of PSE: METI designated this category in February 2018, with a one-year transition period ending February 1, 2019, after which a mobile battery without a valid PSE registration could no longer lawfully be manufactured, imported, or sold in Japan. This is a different and older category from the 2022 lithium-ion storage-battery technical-standard revision aimed at higher energy-density packs used in power tools and e-mobility products, where a separate transition deadline applied to cells meeting a defined energy-density threshold.
The two categories exist because the risk profile differs: a phone-charging power bank and an e-bike traction pack are regulated as distinct product classes with different applicable technical standards, even though both use lithium-ion chemistry. Do not assume a single bright-line capacity figure separates them; the correct classification depends on the specific cell's rated characteristics against the current METI designated list, and that determination should be run per model rather than assumed from a competitor's product. The e-bike side of this distinction, including its own narrower exemption pathway, is covered in the e-bike battery PSE exemption guide, which is a useful contrast for seeing how a closed exclusion list works in practice.
Key points:
(a) A mobile/portable power bank is classified as 特定電気用品以外 (a non-specified electrical appliance), displaying the round PSE mark (丸PSE). This is self-declaration based: there is no mandatory third-party certification or factory inspection, but there is still a mandatory METI filing before sale.
(b) Under Article 3 of the Electrical Appliance and Safety Act, anyone carrying on the business of manufacturing or importing a regulated electrical appliance, including the mobile battery category, must file notification (届出) with METI within 30 days of starting that business, stating the product category classification and, for an importer, the manufacturer's name and address.
(c) UN38.3 test passage determines whether the cell is classified under UN 3480 (lithium-ion batteries shipped alone or in bulk) or UN 3481 (lithium-ion batteries packed with or contained in equipment), which in turn determines the IATA or IMDG packing, marking and documentation obligations on the transport side.
Who Files the METI Notification If the Importer Has No Japan Office?#
A foreign importer with no Japan establishment cannot file the Article 3 notification directly, because the filing requires a Japan-resident party to stand as the Notifying Supplier (届出事業者) whose name then appears on the PSE mark. This is a structural gap, not a paperwork delay: without a resident filer, the product has no lawful route onto the Japan market regardless of how complete its technical documentation is.
This is exactly the role Aplash's Notifying Supplier service fills for lithium-ion and other PSE-regulated categories: Aplash takes the METI contact seat, holds the filing obligation, and carries the ongoing record-keeping and audit-cooperation duties that attach to a lithium-ion Notifying Supplier registration. That seat is a continuing legal position, not a one-time filing, so it is worth confirming scope and renewal terms before a first shipment is booked. Aplash's product-compliance support for this gap is described on the ACP / trade compliance service page.
Does UN38.3 Replace the Need for PSE, or Vice Versa?#
No. Neither certification substitutes for the other, because they sit on different sides of the supply chain and are checked by different parties entirely. UN38.3 test documentation is checked by the carrier, the freight forwarder's dangerous-goods desk, and customs authorities at the point of transport; PSE registration is checked at the point of market placement in Japan, by METI and, downstream, by any retailer or platform verifying the mark before listing the product. Treating either certification as sufficient on its own is where first shipments most commonly fail.
A shipment that arrives in Japan with a clean UN38.3 test summary but no PSE filing can still clear customs and still be unsellable, because customs clearance and market-placement legality are governed by separate acts. The reverse also happens: a fully PSE-registered power bank can be refused for carriage if its UN38.3 test summary is missing, expired, or does not match the exact cell model shipped. Smaller single-cell products sometimes qualify for a reduced dangerous-goods testing or documentation burden under separate provisions, but that exception is narrow and does not extend to a power bank's larger multi-cell pack; the button cell battery dangerous goods guide covers where that smaller-cell exception actually applies, by contrast.
Frequently Asked Questions#
Does every lithium-ion power bank need a new UN38.3 test, or can it rely on the cell manufacturer's test?
The test summary follows the specific cell or battery model, not the finished product brand, so a power bank built around a cell that already has a valid UN38.3 test summary on file does not need re-testing of that cell. The importer or its freight party should still confirm the test summary matches the exact cell model and configuration shipped, and that the summary is available on request from the manufacturer or a subsequent distributor in the supply chain.
How long does the PSE filing take once the product is classified?
The notification itself is filed within 30 days of starting the import business under Article 3 of the Electrical Appliance and Safety Act, but the practical lead time depends on how quickly the self-declaration dossier and lab testing are assembled beforehand. Treat the 30-day window as a filing deadline once the business has started, not as the total project timeline from a standing start.
Can Aplash act as both the Notifying Supplier and the customs-side compliance contact for the same shipment?
Aplash's Notifying Supplier role (the PSE filing and ongoing METI registration) and its customs-procedure support are structured as separate, clearly scoped services rather than merged into one filing. Which combination applies to a given shipment depends on the importer's residency status and the product's classification, and that scoping should be confirmed before the first shipment is booked rather than assumed from a similar product's history.
This article is informational only and does not constitute legal, tax, or regulatory advice. Consult a qualified advisor before acting on the content. Last updated: October 2026.