Shipping Lithium Batteries in 2026: The 30% Charge Rule and What It Means for Prototypes and Beta Units

Shipping lithium batteries got stricter on 1 January 2026.

Under the 2025-2026 ICAO Technical Instructions and the 67th edition of the IATA Dangerous Goods Regulations, lithium-ion batteries packed in the same box as the device they power (UN 3481, Packing Instruction 966) must now be offered for air transport at a state of charge of no more than 30% of rated capacity, unless the relevant States approve otherwise.

Batteries shipped on their own were already held to 30%, and for batteries installed inside a device 30% (or 25% on the device's own battery gauge) is strongly recommended.

Prototype cells and packs that have not passed UN 38.3 testing are a separate case: by air they can only go on cargo aircraft with government approval.

For a hardware team, the practical answer is to build a firmware ship mode that parks the battery at a known low charge, use UN 38.3 tested cells for anything you send to testers, and plan ground shipping or approvals for anything untested.

This guide is for founders, electrical and firmware engineers, and program managers who are about to send battery-powered prototypes out of the lab: beta units to testers, samples to a certification lab, devices to a pilot site, or a box of spare packs to a contract manufacturer.

It applies to IoT sensors, trackers, handheld tools, wearables, edge AI devices and small robots alike. If you are still planning the beta, start with our hardware beta testing guide.

If your product is an e-bike, scooter or other micromobility device, see our CPSC lithium battery micromobility guide, and if you sell into Europe, the EU digital battery passport checklist.

IATA's 2026 battery guidance says that from 1 January 2026, lithium-ion cells and batteries packed with equipment (Packing Instruction 966) must be offered for air transport at a state of charge not exceeding 30% of rated capacity.

This applies to Section I shipments and to Section II cells or batteries rated above 2.7 Wh. Anything above 30% can only ship with the approval of the State of Origin and the State of the Operator (Special Provision A331).

JAL Cargo's customer notice put it plainly: what was a "should" in 2025 became a "must" in January 2026. Batteries rated at or below 2.7 Wh remain a "should."

For lithium-ion batteries contained in equipment (Packing Instruction 967), IATA recommends shipping at no more than 30% state of charge or with an indicated battery capacity of no more than 25%, meaning the remaining capacity the user sees on the device's gauge or indicator lights.

IATA calls this a strongly recommended safety measure, not a mandatory one. The same guidance applies the 30% or 25% limit as a requirement to battery-powered vehicles with batteries above 100 Wh.

Lithium-ion batteries shipped by themselves (UN 3480, Packing Instruction 965) must already be at 30% state of charge or less, and IATA's classification flowchart lists them as forbidden on passenger aircraft, so they travel as cargo aircraft only.

IATA's 2026 guidance covers sodium ion batteries with organic electrolyte (UN 3551 and UN 3552). The ICAO rules are currently silent on their state of charge when packed with or contained in equipment, and IATA recommends shipping them at no more than 30%.

IATA says batteries shipped at a reduced state of charge are less prone to thermal runaway. FAA data summarized by Lion Technology on 11 February 2026 listed 93 lithium battery incidents involving smoke, fire or extreme heat on aircraft in 2025, 80 on passenger aircraft and 13 on cargo aircraft. FAA notes that its list is not a complete record of every event.

In the US, the Hazardous Materials Regulations (49 CFR) cover ground and domestic shipments. Batteries shipped alone by air already face the 30% limit through Special Provision A100.

On 10 February 2026 PHMSA proposed a harmonization rule (HM-215R) that would extend that 30% limit to additional lithium-ion battery entries and to new sodium ion entries, consistent with the 2025-2026 ICAO Technical Instructions.

Comments closed on 13 April 2026, and as of 26 October 2026 the Federal Register docket shows only the proposed rule. International air shipments are prepared to the ICAO Technical Instructions, which the IATA Dangerous Goods Regulations put into practice for airlines, so check with your carrier which rules it applies.

A second 2026 rule matters for field teams.

PHMSA's materials of trade final rule, published 4 August 2026 and effective 3 September 2026, lets trade crews carry up to 30 kg per lithium battery and 500 kg per vehicle, with no limit for batteries installed in equipment, as long as the batteries are of a type that passed UN 38.3.

PHMSA also said that prototype batteries are generally transported for testing, development or certification, that those shipments are outside the materials of trade exception, and that prototypes do not have an established safety record.

In plain terms: do not assume an engineer can toss untested prototype packs in a truck under that exception.

Every lithium cell and battery design must pass the tests in sub-section 38.3 of the UN Manual of Tests and Criteria before it ships under the normal rules. Manufacturers and distributors of cells, batteries and battery-powered equipment made after 30 June 2003 must also make a UN 38.3 test summary available (button cells installed in equipment are excepted), and IATA notes this can be a web page linked by URL or QR code instead of paper in every box.

Prototype and low production batteries are the exception, and the exception is narrow:

What it means for a prototype program: a custom battery pack that has not been through UN 38.3 is much harder to move than a device built on tested cells and packs. If you want beta units in testers' hands by air, either design around a UN 38.3 tested pack early or budget the time and cost to test your own pack before the beta.

The 30% rule is a logistics rule, but most of the fix lives in the product. Teams that treat it as a design requirement during prototyping avoid a warehouse full of devices that have to be discharged by hand.

In 2026 the charge level of a lithium battery is part of how it ships. Hardware teams that design ship mode, battery gauges, tested packs and a return plan into the prototype will get beta units to testers faster and avoid shipments stuck at the dock.

This article explains public transport rules for product planning. It is not legal or regulatory advice, and it does not replace a trained dangerous goods shipper.

See also our electronic design services, the electronic product prototyping guide and the connected device development cost guide.