You’ll need to keep your portable charger visible anytime you're using it, which means no leaving your phone to charge in your baggage or the overhead storage compartment.

Portable chargers and power banks might be useful additions to your carry-on luggage, but they’re also a potential fire risk. Now Southwest Airlines is tightening rules around their use on board aircraft.

With anxiety of in-flight fires on the rise, airline carriers around the globe are changing policies surrounding portable batteries and chargers. In the United States, Southwest Airlines is the first of the four biggest American carriers to introduce new restrictions.