Three documents, three different questions

In one conversation a buyer will usually say “the battery is certified” about three unrelated things: the pack can fly, the pack's chemistry is documented, and the garment meets European substance rules. Those are three documents, issued for three different purposes, and none of them substitutes for another.

Getting this straight before an order prevents the most expensive failure in this category — a finished production run sitting in a warehouse because a forwarder will not accept it.

UN38.3 is a transport test, not a safety mark

UN38.3 verifies that a cell or pack survives a set of mechanical and environmental conditions — altitude simulation, thermal cycling, vibration, shock, external short circuit and impact — without fire, leakage or disassembly. It is a test report, not a certification of product quality, and it does not tell a consumer that a jacket is safe to wear.

What it does do is get the cargo on the plane. Airlines and freight forwarders require the test summary before they will accept lithium cells or packs, and they will ask for it by name. Without it the shipment stops at the warehouse, whatever the hangtag says.

MSDS describes the pack, not the garment

A Material Safety Data Sheet records the chemistry of the battery, its hazard classification and the handling precautions required. It is written per cell and pack type, and it is a documentation requirement for carriers and customs rather than a consumer document.

The practical consequence is that it is tied to the supplier. Change the pack, and the sheet changes with it — an MSDS for one battery tells a forwarder nothing useful about a different one.

CE and REACH cover the garment

For European buyers, CE marking and REACH compliance address restricted substances, labelling, and the low-voltage requirements that apply to the heating circuit. These are garment-level declarations: they describe what the finished product contains and how it is marked.

They are not battery transport documents, and a supplier who offers “CE for the battery” is answering a question you did not ask. A heated jacket programme generally needs both a garment declaration and a pack document set, and they are handled by different people.

The mismatch that stops a first shipment

The most common reason a first heated shipment gets held is not a missing document — it is a document that does not match. A UN38.3 summary issued for one cell, inside a pack assembled from another. An MSDS naming a model number that no longer appears on the casing. A pack whose capacity exceeds what the chosen transport mode allows, with paperwork that assumes it does not.

Documents are only valid for the exact article they describe. When a battery supplier changes mid-programme — which happens, and is not automatically a problem — the document set has to be reissued for the new pack before the shipment is booked, not while it is waiting.

What to hand your forwarder

  • The UN38.3 test summary for the exact pack being shipped, including the assembled pack rather than only the bare cell.
  • The MSDS for that same pack, with a model designation that matches the casing.
  • A declaration of the pack's capacity and configuration that fits the transport mode you are using, since air and sea do not apply the same limits.
  • For European destinations, the garment's CE and REACH declarations, kept separate from the battery file so nobody has to guess which document answers which question.

Ask before you order, not after

Document requirements follow the destination market, and they are cheapest to satisfy while the specification is still open. A buyer who names the target country at briefing gets the right pack and the right file set on the first attempt; a buyer who mentions it after production gets a re-test, a delay, or both.

We ship with UN38.3 and MSDS on file for the packs we use, and we will tell you which additional documents a new market needs before you commit to an order.