Starting April 15, a new rule out of Singapore could catch many travellers off guard — you’ll only be allowed to carry two power banks in your hand luggage. Any extras? You’ll have to throw them away before boarding.

The move, announced by the Civil Aviation Authority of Singapore, follows updated global safety guidelines from the International Civil Aviation Organization aimed at reducing the risk of lithium battery fires mid-flight.

Why have power banks become a focus of aviation safety regulations? And will limiting the number of power banks on flights actually make flying safer?

On The Big Story, Debbie Yong speaks with Dr Teo Tee Hui, Senior Lecturer in Engineering Product Development at the Singapore University of Technology and Design, to find out more.