Passengers travelling to the US may face serious problems at the airport if their gadgets are not charged. Travellers who arrive at the airport with dead cellphones, laptops and other gadgets will be stopped from boarding the plane. US Security Transport Administration says &ldquoPowerless devices will not be permitted onboard the aircraft. The traveller may also undergo additional screening.&rdquo Turning on the device will ensure that it&rsquos a working equipment and not hidden explosive.  They are also likely to introduce more security checks in the future.