Toronto firefighters are reporting a significant increase in hazardous lithium-ion battery fires that can explode and reignite after being extinguished [1, 2].
These incidents pose a critical threat to first responders and residents because the chemical nature of the batteries makes them unpredictable. Unlike traditional fires, these blazes can release carcinogenic contaminants and launch debris as projectiles [1, 2].
Toronto has seen more than 200 percent growth in lithium-ion battery fires since 2022 [4]. This surge was particularly noted through 2026 [1, 4]. The Toronto Fire Department said these fires are uniquely dangerous due to their ability to restart hours after the initial flames disappear [3].
Firefighters said that a lithium battery fire does not always stay out once the flames disappear [3]. This tendency for reignition complicates firefighting efforts and requires extended monitoring of the site to ensure public safety.
Beyond the risk of fire, the chemical composition of these batteries creates health hazards for those on the scene. The fires emit toxic chemicals that can contaminate the protective gear used by emergency personnel [2].
The intensity of the fire is often linked to the energy stored in the device. Lane Harrison said, "Fires can be more aggressive based on how charged the battery is, which firefighters often have no way of knowing" [1].
Because of these risks, the department is emphasizing the need for specialized decontamination procedures. The combination of explosive potential and toxic runoff makes these incidents more complex than standard residential or vehicle fires [1, 2].
“Toronto has seen more than 200 per cent growth in lithium-ion battery fires since 2022”
The rapid increase in lithium-ion battery fires reflects the growing adoption of e-bikes and portable electronics in urban centers. For municipal emergency services, this shift requires a transition in training and equipment, as traditional firefighting methods are insufficient for batteries that can reignite or release carcinogenic fumes, necessitating more rigorous decontamination and monitoring protocols.
