EASYLONGER CPAP Battery ES960, 297.6Wh (Exceeds Airline Limit) CPAP Pwoer for AirSense 11, AirCurve 11, AirSense 10, AirMini, DreamStation/2, etc. Emergency Backup for Camping Outdoor Use

If you’re planing to plug the AC adapter on it then that will waste power. I would recommend one made for CPAPs. The AirSense 11 is 24v as well, there are car cigarette outlet step up adapters for the AirSense but I don’t see one on that. I have an easylonger from Amazon as a backup battery for my CPAP. Edit: I have this one but there are smaller cheaper models. My work benefits even covered it.