Emirates and Turkish Airlines ban powerbanks

Dubai airline Emirates, along with Turkish Pegasus and Turkish Airlines, have banned the use of powerbanks on planes. You can still bring them with you, but charging devices on board is not allowed. Additionally, Emirates has banned carrying more than one powerbank and has outlined placement rules: they can now only be kept in the seat pocket in front of you or in the bag under the seat - external batteries should not be on the overhead compartments.