What is UN38.3 and what does it cover?

UN38.3 is the lithium battery test series in the UN Manual of Tests and Criteria. It comprises eight tests - altitude simulation, thermal cycling, vibration, shock, external short circuit, impact or crush, overcharge, and forced discharge - and cells and batteries must pass them before they can be transported. Manufacturers and distributors must be able to produce a test summary on request. Note that the manual is periodically revised and the industry moved to a new revision with effect from the start of 2026, so confirm which revision your documentation cites.

What do UN3480 and UN3481 mean?

They are UN numbers identifying how the battery is being shipped. UN3480 covers lithium-ion batteries shipped on their own; UN3481 covers lithium-ion batteries packed with equipment, or contained in equipment. Each maps to a packing instruction - PI965, PI966 and PI967 respectively - and each has its own quantity limits, packaging requirements and documentation obligations. Getting the classification wrong is the most common cause of a shipment being refused at the airport.

What is the state-of-charge rule?

Under the IATA DGR edition effective from 1 January 2026, lithium-ion batteries shipped on their own under UN3480 must be at no more than 30 percent state of charge, and the limit was extended to spares packed with equipment above a small watt-hour threshold. The reason is straightforward: a battery with less stored energy releases less energy if it goes into thermal runaway, and the whole regulatory framework is built around limiting that energy. Confirm the current figure with your carrier before shipping - this is an area that changes.

How does case design prevent short circuits?

By giving each battery its own cavity so terminals cannot contact each other or anything conductive, by using non-conductive foam, and by holding the battery so it cannot rotate or slide into contact. Insulating covers or tape on the terminals add a second layer. A cavity cut to the battery is materially safer than a compartment into which batteries are dropped, because the case enforces the separation rather than depending on how it was packed that morning.

Does the case itself have to be certified?

For many shipments the battery must travel in UN-specification packaging, which is a certified carton system rather than a reusable protective case - a distinction worth understanding before you buy. A reusable case can serve as the outer handling and protection layer, and can certainly satisfy the cushioning, movement-prevention and stack-test expectations, but for standalone battery consignments in particular you should confirm with your dangerous goods adviser and carrier what packaging is required. This article is a design and planning overview, not a dangerous goods declaration.

Power Tool and Lithium Battery Cases: UN38.3 & IATA DGR

A case carrying power tools is an ordinary packaging problem until it carries lithium-ion batteries. The moment batteries are in it - as spares, as kits, or installed in the tools - the consignment is regulated dangerous goods, and the case has to support requirements that have nothing to do with impact protection.

This article is a design and planning overview of how a case supports lithium battery transport. It is not a dangerous goods declaration, and it does not replace the current IATA DGR, the applicable UN Manual revision, your carrier's conditions, or advice from a certified dangerous goods adviser. The rules in this area are revised; verify before shipping.

What the rules require, and what the case contributes

Requirement	What it means	How the case supports it
UN38.3 test series	Cells and batteries must pass eight tests before transport; a test summary must be available	Documentation, not case design - but the case must not alter the battery's configuration
Correct UN number and packing instruction	UN3480 / PI965 standalone; UN3481 / PI966 packed with equipment; UN3481 / PI967 contained in equipment	The case must match the declared configuration - tools with batteries installed is a different shipment from spares in a case
State of charge limit	A maximum charge level for standalone and spare batteries, tightened from the 2026 DGR edition	Not a case function, but the case is where the discharge record travels with the kit
Short circuit prevention	Terminals must be protected and batteries separated	Individual cavities in non-conductive foam, one battery per cavity
Movement and impact protection	Packaging must prevent movement, crushing and impact damage	Cut foam cavities, no voids, structural shell
Stack strength	Packages must withstand stacking equivalent to a defined stack test	Rigid shell, load distributed through the structure rather than through the contents

Hard tool case sized for cordless tool batteries and chargers — Battery transport rules and case design are independent questions — settle the rules first.

The UN38.3 test series in plain terms

Altitude simulation. Low pressure, as in an aircraft cargo hold.
Thermal cycling. Repeated passage between hot and cold extremes.
Vibration. Sustained transport vibration.
Shock. A high-acceleration mechanical impact.
External short circuit. Behaviour when the terminals are shorted.
Impact or crush. Mechanical abuse of the cell itself.
Overcharge. Charging beyond the normal limit.
Forced discharge. Driving current backwards through the cell.

The point of the series is to answer one question: if this battery is abused in the way transport abuses batteries, does it contain the failure or does it propagate? Everything downstream - the state-of-charge limit, the separation requirements, the packing instructions - exists to reduce the energy available if the answer is unfavourable.

Case design: separation is the deliverable

Whatever else a battery case does, its primary job under the regulations is to guarantee separation. That is a design outcome, not a packing instruction, and it is the difference between a case that enforces safety and a box that merely permits it.

One battery per cavity. Not a compartment that batteries are placed into. A cut cavity per battery, sized so the battery cannot rotate or lie across two terminals.
Non-conductive foam throughout. The foam is the separator; it must not be a conductive or anti-static grade that creates a path between terminals.
Terminal recesses. Where the battery format allows it, recess the terminal end so it cannot contact the cavity wall under load.
Retention under vibration. The cavity should grip the battery body, not the terminals, and hold it without the lid pressing on the cell.
Separate the metal. Bits, blades, chuck keys and fixings in the same case as batteries are a short-circuit risk. Give them their own cavity, physically separated from the battery zone.

Anti-static foam, correct for electronics, is the wrong choice for an uninsulated battery cavity. It is deliberately resistive rather than insulating, and the requirement here is the opposite. Say which you need when specifying.

Planning a shipment

Classify first: are the batteries installed in tools, packed with them, or shipped alone? The packing instruction follows from the answer, not from preference.
Confirm the current state-of-charge requirement with your carrier, and record the discharge evidence.
Confirm whether UN-specification packaging is required for your consignment, or whether your reusable case is accepted as the outer layer.
Get the test summary for the actual cells being shipped, and check which revision of the manual it cites.
Check quantity and weight limits per package - these are per-package, not per-shipment, and a single oversized case can fail where two smaller ones pass.
Confirm markings and labels before the case arrives at the airport; a technically compliant case without the correct label is still refused.

The case is the part of this that you control, and it is where the physical requirements - separation, retention, movement prevention, stack strength - are either guaranteed by design or left to chance. For JUNZHIJIA cases intended to carry lithium batteries, describe the battery format, the count, whether terminals are insulated, and the classification you will ship under, so the cavity layout and foam specification are designed against the separation requirement rather than adapted afterwards.

Power Tool and Lithium Battery Cases: Transport Rules and Case Design

What the rules require, and what the case contributes

The UN38.3 test series in plain terms

Case design: separation is the deliverable

Planning a shipment

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