New Delhi, June 5 -- Jetting off soon for summer travels? If you're planning on bringing an extra battery charger for your phone or other devices, be aware of the latest rules when taking one on a flight.

Rechargeable lithium-ion portable battery chargers, also known as power banks, come in protective enclosures of various shapes and sizes. They're a handy and popular way for getting more juice when you're on the move.

But after a spate of smoke or fire incidents, U.S. and international aviation authorities have issued new guidelines and airlines have tightened up rules for passengers.

Here's a guide on flying with power banks.

The rules around power banks on planes

The most important thing to know is that you can't pack lithium batt...