Rethinking Lithium Metal Battery Rules

A Long-Standing Rule in Dangerous Goods Training

One of the most rewarding parts of being a Dangerous Goods (DG) instructor is engaging with professionals across the industry — all working to ensure the safe handling, storage, and transport of hazardous materials.

For years, training on lithium batteries has centered around a clear distinction: lithium metal batteries are not rechargeable, while lithium-ion batteries are.

That has long been a cornerstone of regulatory instruction — but as technology advances, it’s time to rethink what we know.

The Emergence of Rechargeable Lithium Metal Technology

Recently, both a colleague and I encountered something that challenged this long-standing rule: rechargeable lithium metal batteries.

Yes, rechargeable lithium metal is here — appearing in technical specifications, product data sheets, and even transport documentation. These new-generation batteries promise greater energy density, longer lifespan, and faster charging compared to traditional lithium-ion cells. They’re being developed for use in cutting-edge applications.

However, while the chemistry has evolved, the regulatory framework hasn’t yet caught up.

Classification and Regulatory Framework

Despite their rechargeable capability, these batteries are still classified as lithium metal batteries — not lithium-ion.

According to current regulations, they fall under the following UN numbers:

UN3090 – Lithium metal batteries
UN3091 – Lithium metal batteries contained in or packed with equipment

The determining factor remains the grams of lithium content, not whether the battery can be recharged.

What This Means for Shippers and Compliance Teams

For compliance professionals and shippers across North America, this means:

U.S.: Regulated under 49 CFR, enforced by PHMSA.
Canada: Regulated under the Transportation of Dangerous Goods (TDG) Regulations.
International: Governed by IATA DGR (air) and the IMDG Code (marine).

In short: Rechargeable or not, these batteries are still considered lithium metal under regulations.

Updating Our Training and Language

This development has prompted an important update in our training approach. Where we once said “lithium metal batteries are not rechargeable,” we now clarify that they are typically non-rechargeable.

This subtle shift ensures that our messaging reflects both current regulatory accuracy and technological evolution. It helps prevent misclassification errors and prepares professionals to adapt as the industry — and the rules — evolve.

Why It Matters

As innovation accelerates, the line between lithium-ion and lithium metal technologies continues to blur. For organizations involved in battery logistics, this reinforces the need for ongoing education, proactive compliance strategies, and regulatory awareness.

Staying informed isn’t just about passing inspections; it’s about future-proofing your operations. When regulations eventually evolve to reflect new battery chemistries, those who have already adjusted their understanding will be well ahead of the curve.

At ICC, we believe compliance begins with awareness — and staying informed today ensures we’re ready for the changes of tomorrow. Do you have questions about Lithium Batteries? Take a look at our Lithium Battery FAQ, or contact our team of experts at 855.734.5469 or send us an email, we’re happy to help.