Travelers departing for the United States will be asked to turn every electronic device before boarding, so check that the batteries are truly such

electronic devices

Higher levels of control on the part of U.S. authorities. U.S. intelligence has warned of possible actions with explosives hidden in batteries of electronic devices that commonly carry with us, phones, tablets, computers, and invisible to the detectors.
For this to travelers departing for the United States will be asked to turn cell phones and every other electronic device before boarding, so check that the batteries are really such. Devices that do not light can not be brought on board and the owners “should be subjected to further investigation.” The checks will be carried out by local authorities in 250 airports around the world from which flights depart for the United States.

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