Some methods require pumps which can contain dry-cell batteries.  Inform your airline at the point of booking so the airline’s special assistance booking unit can check for use before the flight. Most airlines do not provide an aircraft electrical supply for passenger medical equipment and therefore your equipment will have to be battery-powered if you wish to be able to use it during flight. All batteries, including any spare batteries, must meet the airline requirements for carriage, whether carried as hand baggage or in your hold baggage.