Hey Scuba, fellow cpap user here also. I found that the small lithium battery jump starters work great for powering my cpap while camping.
The 'medical grade' packs are approx $400 but you can get the 12v jump packs for sub $150.
I went with the weego 1200mah. It will power my machine for approx 14hrs (2 nights) without the humidifier
But I just charge it on the bike during the day while we ride.
The weego came with all the cords and even cords to charge my iPhone and sena. Plus the jumper cables that actually work great on everything I have used them on, including my buddy's dodge Cummings
The best thing, it's smaller than an old vcr tape
Edit- I have the model js12
https://myweego.com/product/heavy-duty-js12/
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