If I were you, I'd go with the following
https://www.klm.com/travel/us_en/pre...m_cares.htm#p3
Medical Information Forms
If one of the descriptions below applies to you, please consult your physician prior to travel. In some cases, your travel agent or KLM reservations agent must complete
Medical Information Form A(PDF, 305KB) and your doctor must complete and sign
Medical Information Form B(PDF, 944KB). These should be in the possession of KLM no later than 48 hours before departure.
Passengers suffering from a contagious disease.
Passengers who, due to illness or a physical condition, display behavior that could potentially influence the comfort and well-being of the other passengers and/or the crew, or that could present a risk to the safety or punctuality of the flight.
Passengers who will need medical care or will be dependent on specific medical equipment during the flight.
By the way, I am a satisfied owner of this CPAP battery -
http://cpapcharge.com/ - used it on a 15+ hrs flight between LAX-MEL and back