USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Interpretation Response #23-0045

Below is the interpretation response detail and a list of regulations sections applicable to this response.

Interpretation Response Details

Response Publish Date:

Company Name: L-H Battery Company, Inc.

Individual Name: Mr. Rick Riggle

Location State: OH Country: US

View the Interpretation Document

Response text:

January 30, 2024

Mr. Rick Riggle
Chief Operating Officer
L-H Battery Company, Inc.
8500 Bluegrass Blvd. NW
Jeffersonville, OH  43128

Reference No. 23-0045

Dear Mr. Riggle:

This letter is in response to your April 17, 2023, letter requesting clarification of the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180) applicable to lithium ion batteries transported by highway. In your letter, you describe a lithium ion battery module that weighs more than 12 kg with an aluminum casing. As depicted in the photographs you provided, the aluminum casing has a series of large ventilation slots on the top for heat dissipation and a layer of poly carbonate that separates the cells from the casing and protects the cells from direct exposure. You ask whether the lithium ion battery module configuration with the large ventilation slots satisfies the “strong-impact-resistant outer casing” requirement as specified in § 173.185(b)(5).

Provided that (1) the aluminum casing with large ventilation slots—as depicted in your photographs—is strong and impact-resistant, (2) the lithium ion batteries are secured to prevent inadvertent shifting, (3) the terminals do not support the weight of other superimposed elements, and (4) the lithium ion battery module configuration is further packaged in strong outer packagings, protective enclosures, or on pallets or other handling devices, it is the opinion of this Office that the specific packaging configuration you describe and provided photographs for is acceptable for highway transportation in accordance with § 173.185(b)(5).

I hope this information is helpful. Please contact us if we can be of further assistance.


T. Glenn Foster
Chief, Regulatory Review and Reinvention Branch
Standards and Rulemaking Division


Regulation Sections

Section Subject
173.185 Lithium cells and batteries