Hi Winch control
System internal battery life one hour, cannot attach power unless 240v external power source. Do you trust internal battery life, I know I don't despite what it may say on the tin. Never really designed for transfers as patients normally too sick to transport but we have got the customer into a condition where we can move them for a different system.
Propak uses extended battery cells which this does not have, and it is power hungry, even ground transport uses an inverter in an ambulance for the move, but we feel that movement by air is a better option for the patient, if possible, that is why I threw out to the Pprune community for some guidance and advice.
Regards
Air pig