Lithium-Ion Batteries Caused Fatal Boston Fire

Boston Fire Commissioner Rodney Marshall said the fire at 18 Treadway Road began on an enclosed third-floor porch. Investigators determined that multiple lithium-ion batteries kept in plastic toolboxes underwent thermal runaway, a process in which a battery generates more heat than it can release. Kilduff died after falling from the porch as he responded to the fire.

Kilduff was 53, had served with Boston Fire for 24 years, was a third-generation firefighter and a former U.S. Marine. Mayor Michelle Wu said the city is working to honor his service and support his family. Marshall said the death had deeply affected the department, the family and the Boston community.

The Boston Fire Department’s Board of Inquiry and federal workplace-safety officials continue their investigations. They are examining the circumstances of Kilduff’s death, and officials said they would share updates when possible.

Marshall urged people to follow manufacturers’ safety guidance when charging, handling and storing lithium-ion batteries. District Fire Chief Keith Kelley advised using batteries certified by a recognized testing organization, plugging them in using their supplied power unit while they rest on a firm, level area, and keeping them at room temperature. Kelley also cautioned that the growing presence of batteries in homes could bring more accidents.