It appears airlines are tightening up on using their power source for us hoseheads. I've done a search for battery packs and see a vast price difference btwn a few types. Most are the lithium ion, some claim to power for several days. My needs are pretty straightforward. I fly across the pacific a couple times of year, usually 16 hour flights. I usually sleep 6-8 hrs on these flights.

I have a ResMed S8 AutoSet II which I use for travel, and newer S9 Auto for home use. I understand ResMed S8 has some quirks that require a special inverter ?????

Suggestions welcomed for a battery pack for in-flight use, for only 6-8 hours [no humidifier used].

Many thanks.