Key points
- A toothbrush with the cell sealed in the handle is UN 3481, PI 967, usually Section II — which is the lightest rule set available.
- Putting a spare cell in the same carton moves the shipment to PI 966, a different and tighter rule set. This is the most avoidable mistake in the category.
- UN 38.3 is an eight-test report on sample cells, not a certificate for the product, and it follows the cell manufacturer — not the brand.
- From 1 January 2026 the 30 % state-of-charge limit also applies to many cells above 2.7 Wh packed with equipment — but not to cells contained in equipment.
A powered toothbrush contains a lithium-ion cell, which makes it regulated cargo before it is a product. The most common cause of a delayed first shipment in this category is not production — it is battery paperwork nobody ordered until the freight forwarder asked for it. This note sets out the documents, the packing instructions and the packaging tests that decide whether the container moves.
The classification, first
A toothbrush with the cell installed and sealed inside the handle is UN 3481, Packing Instruction 967 — batteries contained in equipment. In most cases it qualifies for Section II, the lighter rule set, because a toothbrush cell is a couple of watt-hours — far below the Section II thresholds of 20 Wh per cell and 100 Wh per battery. Section II also imposes a net battery weight limit of 5 kg per package, which no consumer order will approach.
Two traps sit inside that paragraph.
- A spare cell in the same carton moves you to PI 966 (batteries packed with equipment), a different and tighter rule set. If a retail promotion includes a spare battery, ship it separately or leave it out. This is the most avoidable compliance mistake in the category.
- The state-of-charge rules changed. Standalone lithium-ion cells (UN 3480) have long had to ship at 30 % state of charge or below. From 1 January 2026 the same limit also applies to many cells above 2.7 Wh packed with equipment under PI 966. Cells contained in equipment — PI 967, your toothbrush — are not subject to the limit in the same way, which is another reason to keep the cell inside the handle and out of the accessories box.
The document set
| Document | Issued by | Why it exists |
|---|---|---|
| UN 38.3 test summary | The cell or battery manufacturer, tested by a qualified lab | Evidence the cell passed the eight transport tests: altitude, thermal, vibration, shock, external short circuit, impact/crush, overcharge, forced discharge |
| Material safety data sheet (MSDS) | Cell manufacturer | Hazard communication for dangerous goods |
| Air transport assessment | A qualified testing body, per model | What the airline and forwarder file |
| Dangerous Goods Declaration | Shipper, prepared by DG-trained staff | Required for Section I; not normally for Section II, though forwarders may still ask |
| Lithium battery mark | Applied by the shipper | Outer-carton mark carrying a contact telephone number |
| Packaging test report | Packaging supplier or test house | Evidence of the 1.2 m drop test for the packaging |
The UN 38.3 summary is not a certificate you buy for the product. It is a report on sample cells and is valid for the cell design. If your supplier switches cell manufacturer mid-programme, the summary changes with it — ask for the new one before the order ships, not after.
Packaging, beyond the battery
- Master carton. Five-layer AB-flute corrugated is the working standard for export cartons in this category. Get burst-strength and edge-crush figures in writing; “strong carton” is not a specification.
- Drop and stack tests. Ask for an ISTA 1A or 2A drop test on the packed carton, or at minimum the 1.2 m drop the battery packing instructions require. A carton that passes on a concrete floor in Shenzhen and fails in a humid warehouse in Lagos was never tested for the destination.
- Pallet and wood packaging. Wood pallets and crates entering the EU, the US and most of Asia need ISPM 15 heat treatment and the stamp to prove it. This is a two-minute check and a multi-day delay if it is missing.
- Humidity. Sea freight is a humid environment. A desiccant sachet and a moisture-barrier liner in the master carton cost very little and prevent the mould-on-the-box and corroded-contacts complaints that arrive three weeks after delivery.
- Retail pack labelling. Market-specific marks — CE, UKCA, EAC, SASO/G-Mark, WEEE, recycling symbols — belong on the retail pack and are artwork decisions. Adding one after the plate is cut is a reprint.
What we ship with, as standard
Every order leaves with the UN 38.3 summary for the cell actually used, an MSDS, a transport assessment per model, the lithium battery mark on the master carton, and the drop-test record for the packaging. Documents are supplied in the buyer's name where the buyer is the shipper of record. If your forwarder asks for something not on this list, send us the request and we will tell you whether it is a rule or a preference — the two are frequently conflated, and the difference can be several days and a few hundred dollars per shipment.
This note summarises the transport framework for a lithium-battery consumer product as of September 2026. IATA rules and national variants change on a short cycle. Confirm the current requirement with your forwarder or a dangerous-goods consultant before the shipment is booked.
Written from the factory side for professional buyers. Figures are indicative and dated; regulatory summaries are not legal advice.
