Shipping Lithium Batteries by Sea: IMDG Amendment 42-24, UN38.3 and the Cargo-Cover Traps for Indian EV and BESS Exporters

An Indian exporter moving EV cells, battery packs or battery energy storage system (BESS) modules by sea is not moving ordinary cargo. Lithium batteries are classified as Class 9 (Miscellaneous Dangerous Goods) under the International Maritime Dangerous Goods (IMDG) Code, and the classification carries consequences that reach straight into the cargo policy.

The gateway requirement is testing. UN38.3 testing, the sequence of tests T.1 to T.8 covering altitude simulation, thermal cycling, vibration, shock, external short circuit, impact, overcharge and forced discharge, is a compulsory prerequisite for shipment. A consignment without valid UN38.3 evidence is not a borderline case for a surveyor; it is cargo that should not have been tendered for carriage at all.

This matters for cover because a cargo policy does not sit above the regulatory regime. It assumes the goods were lawfully and properly tendered for the voyage. When the dangerous-goods rules are not met, the exporter is exposed not only to carrier refusal and port penalties but to a denied claim, because the underwriter can point to the breach as the reason the loss is not covered. The dangerous-goods status is the first fact a broker should establish on any lithium placement, before discussing rate or sum insured.

The IMDG Code is revised on a two-year cycle, and the current revision tightens the rules that bear on lithium shipments. IMDG Code Amendment 42-24 introduces stricter lithium-ion battery transport requirements, voluntary from 1 January 2025 and mandatory from 2026.

For an exporter shipping through 2026, voluntary is no longer the operative word. The amendment is the live standard, which means packaging, marking, documentation and stowage have to meet the updated rules, and any contractual or insurance representation that the cargo complies with the IMDG Code is a representation about Amendment 42-24, not an earlier edition.

The practical reading is that compliance is a moving target and the policy follows the regulation. A broker placing lithium cargo should treat the IMDG revision date as part of the risk file, because an exclusion for misdeclared or improperly packaged cargo bites hardest where the standard has just moved and the shipper has not.

Cargo underwriters do not write lithium-battery exposure on bare all-risks terms. They attach a lithium-battery warranty, and the warranty converts the regulatory obligations into conditions of the policy.

A typical warranty package requires that the batteries are UN38.3 tested, packed and marked in accordance with the IMDG Code, correctly declared on shipping documents, and carried in line with the carrier's acceptance conditions. Breach of a warranty is more serious than a routine documentation slip, because a warranty goes to the root of cover and a material breach can discharge the underwriter from liability for the loss.

The consequence is that the exporter's internal discipline becomes the insurance position:

1. Testing evidence has to exist and be retrievable, cell by cell or pack by pack, not asserted after a loss.
2. Packaging and marking must match the mandatory IMDG standard for the cell chemistry, state of charge and packing group.
3. The Dangerous Goods Declaration must describe the cargo accurately, with the correct UN number, proper shipping name and Class 9 designation.
4. Carrier acceptance conditions, including any state-of-charge limits and stowage requirements, have to be honoured rather than worked around.

When a broker can show the underwriter that these controls are in place and documented, the warranty is a manageable condition rather than a trap. When they are not, the warranty is the clause the insurer reads back at claim stage.

The reason lithium cargo deserves separate treatment is that the losses are severe and the exclusions are precisely the ones that apply. After lithium-battery container fires, insurers have denied cover under all-risks policies by invoking exclusions for inherent vice, improper packaging or misdeclared cargo, shifting liability to the shipper for breach of declaration obligations.

Each limb is distinct and worth understanding:

• Inherent vice is the tendency of the goods to damage themselves. A cell that goes into thermal runaway because of an internal defect, rather than an external fortuity, raises the argument that the loss arose from the nature of the goods, which all-risks cover does not insure.
• Improper packaging engages where the cells were not packed to the dangerous-goods standard, so the cause traces to how the cargo was prepared rather than to a peril of the voyage.
• Misdeclared cargo is the documentary failure: an incorrect UN number, an understated state of charge, a wrong proper shipping name, or batteries described as something other than Class 9 dangerous goods.

The lesson for a broker is that these are not unusual exclusions inserted to defeat lithium claims. They are standard cargo-policy exclusions that lithium shipments are unusually likely to trigger. The defensive work is upstream: get the testing, packaging and declaration right so that a fire is treated as a fortuity under the voyage rather than as inherent vice, bad packing or misdeclaration.

Not all lithium cargo is the same risk. An EV traction battery is a large, high-energy pack, and underwriters treat it as a step up from a tray of small cells.

EV traction batteries require additional thermal-runaway prevention documentation beyond standard UN38.3 evidence. UN38.3 establishes that the cell type passed the test sequence; it does not, on its own, demonstrate that a large pack has the cell isolation, thermal management and propagation-resistance measures an underwriter wants to see before putting capacity on a container full of them.

For a broker, the EV-pack distinction is a reason to scope the cargo precisely. The class of goods, the energy content, the state of charge, the packing configuration and the thermal-management evidence are all underwriting inputs, and a placement that bundles small cells and large traction packs under one undifferentiated description invites both a harder rate and a weaker claims position.

The recurring failure on lithium cargo is a mismatch: the cells move under one set of declarations, the policy is written on another set of warranties, and the gap surfaces only after a fire. The broker's job is to close that gap before the cargo sails.

The alignment work is concrete. Confirm UN38.3 evidence exists for every cell type in the consignment. Confirm packaging and marking meet the mandatory Amendment 42-24 standard for 2026 sailings. Read the Dangerous Goods Declaration against the policy warranty and check they describe the same cargo. For EV traction batteries, secure the thermal-runaway prevention documentation as a distinct item. Then place the cover so the warranty the exporter can actually satisfy is the warranty the policy contains, rather than a stricter condition the exporter will breach on the first shipment.

Done this way, an all-risks marine cargo policy responds to a genuine voyage peril rather than collapsing into an inherent-vice or misdeclaration argument. Done carelessly, the same policy is a denial waiting for a claim.

Getting this right depends on knowing exactly how each insurer's lithium-battery warranty is drafted and how its dangerous-goods and inherent-vice exclusions are worded, because the difference between a manageable condition and a coverage trap sits in the clause. Sarvada gives commercial insurance brokers structured, searchable access to insurer policy wordings and the intelligence around them, so a lithium-cargo placement can be matched to the exporter's real compliance position clause by clause. Request Access to ground your EV and BESS export placements in the actual wordings that decide these claims.