Shipping telecom lithium: UN3480, UN 38.3 and the returns problem

Two documents and one rule. The documents are routine; the rule is the one that quietly rewrites your warranty process.

VOLT48 engineering desk · Published 24 Aug 2026

Key figures at a glance

Parameter	Value	Where it comes from
UN number and class	UN3480, Class 9	Dangerous goods classification
UN 38.3 test summary	Mandatory since 1 January 2020 — also for the distributor	Transport regulation
Must bear	The exact model number supplied, not the family	VOLT48 shipment verification
Safety standard documented per shipment	IEC 62619:2022 (Ed. 2.0)	Standard reference
Damaged or defective battery	Cannot be transported without prior approval from the competent authority	Transport regulation
Consequence for returns	Remote diagnosis and on-site replacement — not courier return	VOLT48 returns policy

What the classification actually means for you

A lithium battery shipped on its own travels as UN3480, Class 9 dangerous goods. In practice that changes three things about your delivery: who is allowed to carry it, what the packaging and marking have to look like, and how much of the freight quotation is the goods and how much is the handling. It is not an obstacle — telecom lithium moves internationally every day — but a quotation that does not mention it is a quotation from someone who has not thought about it.

The UN 38.3 test summary, and the trap inside it

Since 1 January 2020 the manufacturer or distributor has had to make a UN 38.3 test summary available. "Distributor" includes us, which is why we do not treat it as the factory's paperwork problem. The trap is what counts as evidence: a family-level certificate, an expired certificate, or a standards logo printed in a catalogue are not a test summary for your model. We verify, per shipment, that the document bears the exact model number being supplied. If it does not, the shipment does not go.

IEC 62619 sits alongside it, and UL 9540 does not apply

The safety standard we document per shipment is IEC 62619:2022 (Ed. 2.0). What we deliberately do not claim is UL 9540: that standard covers energy storage systems with a certified inverter, and a −48 V telecom battery has no inverter. UL 1973 comes into it only if a specific destination market asks for it. Naming the standard that does not apply is as much a part of an honest document set as naming the one that does.

The rule that changes your RMA process

A damaged or defective lithium battery cannot be transported without prior approval from the national competent authority. Read that again in the context of a normal warranty flow, because it means the sentence "send it back to us" is not available to you. A returns process for telecom lithium that is written as courier collection is a process that will fail the first time it is used, at the worst possible moment — with a site already down.

So what does a workable returns process look like

It is built the other way round: remote diagnosis first, using the BMS data the pack already exposes, so that the fault is characterised before anything moves. Then replacement on site, with the replacement unit travelling as normal goods rather than the failed one travelling as damaged goods. Then disposal of the failed unit through an authorised handler in-country. That is more work to set up than a returns label, and it is the only version that survives contact with the regulation.

Equipment this guide covers

48V LiFePO4 Telecom Lithium Batteries

Common questions about this family

Do you supply the UN 38.3 test summary with the shipment?

Yes, and we check it before shipping rather than forwarding whatever the factory sends. The check is specifically that the document carries the exact model number supplied — a family certificate or an expired one is not accepted as evidence, and that verification is part of what you are buying from an intermediary rather than ordering direct.

Can I just courier a failed battery back for warranty?

No, not once it is damaged or defective — that requires prior approval from the competent authority, which is why our warranty process is built on remote diagnosis and on-site replacement instead. It is worth checking any supplier's returns wording on this point before you need it, because a lot of it is copied from non-hazardous product terms.