A:Answer YES, THE LITHIUM BATTERY CAN BE CARRIED ONTO AN AIRPLANE IF IT'S IN ONE'S CARRY-ON LUGGAGE. MY FRIEND JUST BROUGHT MY LITHIUM-ION ARLO BATTERY THAT I PURCHASED ONLINE AND HAD SENT TO HIS ADDRESS IN WA STATE. MY FRIEND BROUGHT MY ARLO LITHIUM BATTERY TO ME IN MEXICO IN HIS CARRY-ON LUGGAGE. HE SAID TSA SAW IT AND SAID THAT THESE TYPE BATTERIES CANNOT BE CARRIED IN CHECKED LUGGAGE, ONLY CARRY-ON LUGGAGE . IT IS NOW INSTALLED IN MY ARLO SECURITY CAMERA IN MEXICO.