Battery / Energy storage → Japan

How this pathway works in practice

Japan treats a lithium pack through two separate laws, and which one applies depends on how the pack is used rather than on its chemistry. DENAN covers mains-coupled equipment and certain lithium configurations through the PSE mark, with the diamond mark reserved for specified products that require conformity assessment by a registered body. Transport follows UN 38.3, and any radio function brings the Radio Law and a TELEC technical-conformity certification with the mark that Japanese buyers look for on the label.

Three details most often delay a Japanese launch:

• Which PSE category the product falls into. Diamond and circle marks have different assessment routes and different documentary burdens, and getting the category wrong means restarting the filing.
• Whether the pack is a standalone product or a component inside a mains-powered device, because the duty to hold the filing follows the product that carries the mark.
• Whether the radio is evaluated together with the pack, since TELEC submissions need a stable product description.

We prepare the PSE filing documents and the TELEC evidence from one product description, so the importer is not asked to reconcile two sets of paperwork.

Each mandatory item above is mapped to a test standard inside our accredited scope, then tested on the smallest sample that still covers every variant you intend to ship, so the importer of record can hand the file straight to the Japan assessment route without a second round of questions. The 6–8 weeks lead time counts from the day production-representative samples arrive, not from the day the quotation is signed, and the 3 key documents listed above are the ones most often requested at the border or at listing review.