Airline passengers are being warned not to pack power banks in their hold luggage ahead of the summer holiday travel period.Devices with rechargeable batteries, like mobile phones, laptops, tablets, and smartwatches, can be plugged into power banks on the go, where charging sockets may not be available. However, power banks are not danger-free or environmentally friendly.The warning has come from the UK’s Civil Aviation Authority (CAA), which believes that many travellers still aren’t aware of the rules – or the fire risk.Passengers on UK flights must take power banks – and other items containing lithium batteries – with them into…