Lithium-ion battery fires in Tokyo are increasing at roughly 1.5 times the pace of the previous year [2].
This surge in residential and commercial fires highlights the growing risks associated with the ubiquity of portable electronics and high-capacity energy storage in dense urban environments. As more consumers rely on mobile power banks and rechargeable devices, the potential for catastrophic failure increases.
The Tokyo Fire Department reported that 382 fires caused by lithium-ion batteries occurred throughout 2025 [1]. This total represented a record high for the city. Despite the previous peak, current data for 2026 indicates a significant acceleration in the frequency of these incidents [2].
Officials said the primary cause of these blazes is the improper handling of batteries during use and charging. Mobile batteries are cited as a leading factor in the rise of these emergencies. The volatility of lithium-ion chemistry means that physical damage or electrical malfunctions can lead to rapid thermal runaway, a process where a battery generates heat faster than it can dissipate it.
Firefighters have urged the public to exercise caution when charging devices. They said that using non-certified chargers or leaving batteries to charge unattended increases the risk of ignition. The department continues to monitor the trend to determine if specific product failures are contributing to the spike in numbers [1], [2].
“Lithium-ion battery fires in Tokyo are increasing at roughly 1.5 times the pace of the previous year.”
The acceleration of battery-related fires in Tokyo suggests that the adoption of lithium-ion technology is outpacing public awareness of safety protocols. Because these fires are chemically driven and difficult to extinguish with standard methods, the increasing frequency poses a systemic challenge to urban fire management and building safety codes in high-density cities.
