Something I cannot deal well without, I have to have my CPAP sleep every night or else I revert to a zombie.
What really presented an issue for me was remote area hunting, I regularly go on big game hunts and most every one is in a very remote area with no power available and that has limited me greatly until now.
I recently purchased 2 Li-Ion battery packs (each weigh under 2 pounds) and each pack will run my machine (no heated humidifier) for a night (8 hours) with a little juice left over and I can charge the packs either with 110 volts or 220 volts, 50 or 60 cps. or via a 12 volt power plug in a vehicle
They have made my adventure lifestyle much simpler. I can actually spike camp miles from any power source and still get a good night's sleep. Imperative when hiking and remote hunting.
Been using a PAP machine for over 15 years now.