Lithium batteries are the most common dangerous goods most shippers encounter, usually without realising it. They are regulated in every mode of transport, and the fact that a product is sold freely in shops at destination tells you nothing about how it may be moved to get there. The starting position is that a lithium cell or battery is dangerous goods unless a specific exception applies.
The rules divide along two axes. The first is chemistry: lithium ion and lithium metal are treated separately, with different UN numbers and different limits. The second is configuration: cells or batteries shipped on their own, packed with equipment, or contained in equipment. Those three configurations have different UN numbers, different packing instructions and different documentation, and using the wrong one is a declaration error even if the physical packing happens to be adequate.
Air is the strictest mode by a wide margin, and the reason is straightforward: a fire in a cargo hold at altitude cannot be escaped. State-of-charge limits apply to standalone lithium ion cells and batteries moving by air, packages carry specific marks and labels, and many operators apply restrictions beyond the baseline regulation. Air shipments of standalone batteries in particular require a properly trained shipper and correct declaration — this is not an area for improvisation.
Sea is governed by the maritime dangerous goods regime. The requirements are real but generally more workable than air for larger quantities, which is why bulk battery movements overwhelmingly go by ocean. Correct packing, marking, labelling, container placarding and an accurate dangerous goods declaration are all required, and the container packing certificate matters.
Rail into Europe and Central Asia has its own regime along the route, and the practical position is that acceptance varies by operator and by corridor. Some services accept batteries under defined conditions; others decline them. This needs to be confirmed at booking rather than assumed, because discovering it at the terminal means the cargo is already at the wrong place.
Across all modes, the failure that causes the most trouble is not deliberate concealment — it is not knowing. A consumer product with an embedded battery, a tool with a spare pack in the box, a device with a small backup cell on a circuit board: all of these can bring a consignment into scope. Asking suppliers explicitly, in writing, whether any item contains a battery is a five-minute task that prevents a very expensive discovery.
The consequences of getting it wrong are worth stating plainly. An undeclared battery consignment can be refused, offloaded, destroyed, or reported to the authorities, and the shipper carries the liability. Where a fire results, the exposure is not commercial but legal. Declare accurately, pack to the applicable instruction, and use people who are trained to do it.
