The Tokyo Fire Department said that fires likely caused by lithium-ion batteries have reached a record pace within its jurisdiction [1].
This surge in incidents highlights a growing public safety risk as the ubiquity of portable electronics intersects with extreme seasonal temperatures. Because these batteries are prone to overheating, the increase in fires poses a direct threat to urban residential and commercial areas.
According to data from the department, there were 179 fires suspected to be caused by lithium-ion batteries, such as those found in mobile power banks, between January and May 2024 [1]. This figure represents a 1.5-fold increase compared to the same period the previous year [1].
The department said there is a strong correlation between high summer temperatures and battery failure. When devices are exposed to extreme heat, the risk of thermal runaway increases—a process where a battery cell enters an uncontrollable self-heating cycle.
Historical data indicates that July is typically the month with the highest number of such fires [1]. While some reports suggest a broader peak occurring from June through August, the Tokyo Fire Department said July is the most frequent month for these occurrences [1].
Officials are urging the public to exercise caution with mobile batteries and similar devices during the summer months. The department said that avoiding exposure to high temperatures, and using certified products, can mitigate the risk of ignition [1].
“fires likely caused by lithium-ion batteries have reached a record pace”
The record-breaking pace of battery fires in Tokyo suggests that current consumer safety habits or product quality controls are failing to keep pace with the proliferation of lithium-ion technology. As global temperatures rise and the reliance on portable energy increases, urban fire departments may need to shift resources toward specialized lithium-fire suppression and more aggressive public education regarding thermal management.
