Japan's New Inflight Power Bank Ban: A Safety Precaution
Japan is taking a proactive approach to passenger safety by implementing a ban on the use of portable power banks during flights, effective from mid-April. This decision comes as a response to the growing popularity of these devices and the potential risks they pose. With the International Civil Aviation Organization's upcoming international regulations, Japan is taking a lead in ensuring the safety of air travel.
The Transport Ministry's Decision
Japan's Transport Ministry has announced that it will limit the number of power banks allowed on flights and effectively ban their use during the journey. This includes charging power banks using the plane's AC or USB sockets, which could potentially lead to overheating and other safety concerns. Passengers will be restricted to carrying only two spare batteries, each rated at no more than 100Wh, in their carry-on cabin bags.
Understanding the Wh Rating
It's important to clarify that the 100Wh rating refers to the battery's energy capacity, not its power output. Even high-capacity power banks, like the Anker Laptop Power Bank, which boasts a 25,000 mAh capacity and 165W output, are rated at just 90Wh. This means that even powerful batteries fall well within the allowed limit.
Qantas' Limit and Checked Luggage
Qantas has a limit of 160Wh for power banks, and it's worth noting that these devices are not allowed in checked luggage. Passengers must either bring them on board in their carry-on baggage or leave them at home. This restriction is in line with many Asian airlines' policies, which ban power packs during flights and require passengers to keep them with them at their seats.
The Risk of Lithium-Ion Batteries
Portable power banks often contain lithium-ion cells, which can pose a significant risk if they malfunction. The process of 'thermal runaway' can lead to a rapid release of energy, resulting in extreme heat, fire, or even an explosion. The US Federal Aviation Administration (FAA) reported a concerning 34 lithium battery-related incidents in 2025, with 11 directly linked to personal battery packs. This highlights the importance of implementing safety measures to prevent potential disasters.
