Passengers have always been instructed to switch their devices to ‘flight mode’ but this new warning is even more explicit.
Fire risk and thermal runway
The rechargeable lithium-ion batteries are present in all personal electronic devices so on every flight there are hundreds of these on-board. Take into account that many people will also bring iPads or laptops, and for every flier there may be multiple devices.
When travelling, people often buy cheaper chargers or batteries which are not always covered by safety standards.
This increases the risk of devices overheating and catching fire. This process is called ‘thermal runway’.