The battery life of laptop computers means that they cannot be used for the duration of a long-haul flight without needing to be recharged from an on-board power point. Not all aeroplanes have this facility. Therefore laptop computers should not be allowed as carry-on items for long-haul flights on planes that do not have on-board power points, regardless of whether they are intended for personal or business use, as they will be of limited use to their owners and take up a disproportionate amount of space in the cabin.