An official website of the United States government
Here's how you know
A .mil website belongs to an official U.S. Department of Defense organization in the United States.
A lock (lock ) or https:// means you’ve safely connected to the .mil website. Share sensitive information only on official, secure websites.

    HOME    |    ABOUT    |    MARINE SAFETY LEADERS    |    CONTACT US   

Marine Safety Alert: Saltwater intrusion causes damage to electric vehicle batteries

Feb. 6, 2023

Recently, Hurricane IAN caused significant damage and flooding throughout Florida and the Southeastern United States. During the response and reconstitution after the hurricane, first responders encountered numerous vehicle fires involving Electric Vehicles (EVs) that are powered by Lithium-Ion batteries. Subsequent investigations have revealed that the vehicle fires resulted from exposure of the Lithium Ion batteries to salt water. Many vehicles had been susceptible to flooding. Saltwater exposure can significantly degrade lithium-ion (Li-ion) batteries, causing a chemical reaction that creates an extreme fire risk. Review of vehicle registration records revealed there are over 7,000 electric vehicles (EVs) in Lee County, Florida with potential for damage.

Vessels, ports, and shippers should be aware of this extreme risk and avoid loading EVs with damaged Lithium-Ion onto commercial vessels. Safety Alert 01-22 highlights a recent example of the danger damaged batteries pose. The U.S. Fire Administration further details the hazard in their Responding to Electric Vehicle Fires Caused by Salt Water Flooding article.

The Coast Guard strongly recommends that vessels, ports, shippers, and regulators:

Conduct a comprehensive review of the vehicle shipping requirements found in both the Hazardous Materials Regulations (49 CFR) and the International Maritime Dangerous Goods (IMDG) Code. All lithium batteries are hazardous materials regulated by the Department of Transportation’s Pipeline and Hazardous Materials Safety Administration (PHMSA). As such, they are required to comply with the Lithium Battery Guide for Shippers.

Conduct review of additional requirements for shipping damaged lithium ion batteries located in the PHMSA Safety Advisory Notice for the Disposal and Recycling of Lithium Batteries in Commercial Transportation. Due to the large size of EV batteries, the packaging requirements to comply with damaged shipment regulations are inadequate. As such, IMDG special provision 376 specifically requires approval from the competent authority (PHMSA or US Coast Guard) prior to shipment of damaged lithium batteries.

Remain vigilant and ensure damaged lithium-ion vehicle batteries are not loaded onto vessels for shipment, placed within port facilities, or enclosed in containers.

This Safety Alert is provided for informational purposes only and does not relieve any domestic or international safety, operational, or material requirement. Developed by the Seventh Coast Guard District and the Office of Design and Engineering Standards, Commandant (CG-ENG) and distributed by the Office of Investigations and Analysis, Commandant (CG-INV). Questions may be sent to

Email Updates!

To sign up for updates or to access your subscriber preferences, please click on the link below.

Subscribe Now!

All Entries



This blog is not a replacement or substitute for the formal posting of regulations and updates or existing processes for receiving formal feedback of the same. Links provided on this blog will direct the reader to official publications, such as the Federal Register, Homeport and the Code of Federal Regulations. These publications remain the official source for regulatory information published by the Coast Guard.