I even can start the flow for a couple of seconds but than it stops, displaying this message.

But with the AC converter it still wors fine. The bad thing is that the S9 somehow recognizes that there is something different and writes a message, that I should connect the Powersupply correctly, no matther if i put the small one to 3V or 3,3V. Today I combined those two in one housing and so on, it took me about 4 hours of work. Now I bought one Laptop Caradapter supplying 24V till 4Amps and another caradapter for camcorder or cell supplying 3 and 3,3 Volts till 2Amps. So I searched for the connector and finally found it at some electronic online shop. I measured the voltage on the 3 Pins of the connector the small one is 3,25V one of the bigger ones is GND and the other 24,2V. I plan to go camping next week so I need a 12V DC/DC converter. If 24V then I'd have to make a special converter. If it says something like '12V 5A' like on my Respironics AC adapter, then its easy. If one occasionally need to use a battery looks like the Respironics units are handier, but nowhere near as good as an AIOMED Everest.ДЄnyone know what the output is on the S9 AC adapter? That would tell us if there might be an easy way to kludge up a cable adapter. If they are both 80% efficient then one is throwing out 36% of the battery: 80% x 80% = 64%. Unfortunately, using an inverter followed by an AC adapter is a very inefficient way to run things, as there is a loss in both the inverter and AC adapter. If used without the humidifier (only the S9), you could use a modified sine-wave humidifier of 150 watts or higher.' That is for use WITH the humidifier, you need a pure-sine wave inverter 300 watts or higher. 'You can use the same criteria as the S8s. Please note thatД«atteries wear out with use.I asked Resmed about battery operation of the S9, since the S9 isn't listed in their battery applications document. Warranty covers manufacturing and quality defects only. The battery can also be used with BiXPower AC inverter to provide 110V AC Power:ДЄC Power Inverter is optional and not included with the standard package. Unplug the converter from the CPAP machine when not using the battery. Please turn on the battery first, then connect the DC converter to CPAP Special Note: The DC converter will not provide power to the CPAP machine if the battery is off. With the bundled special DC to DC power converter, this battery can provide 24V DC power to ResMed S9 PAP Machines. Use the battery with the Special DC to DC Power Converter for ResMed S9 Machines Most of the time, the voltage will be around 14V to 16V. The output voltage will decrease gradually and finally will cut off at around 10V. When the battery is fully charged, its output voltage is 16.8V. The battery output voltage range is 10V ~ 16.8V, nominal voltage is 14.8V. One end plugs into the battery output port and the other end can plug into different connector tips. The battery pack comes with a output cable. The charge port connector is a 5.5x 2.5mm barrel connector with positive polarity. This battery's charging voltage is 16.8V ~ 17.1V, and the maximum charging current is 5A. Wrong chargers may damage the battery and can cause fire. Use only BiXPower authorized chargers with the correct settings to charge the battery. The battery pack can be charged from any 100V ~ 240V AC power outlet with the AC charger.

Resmed s9 battery overview