Do they have a wireless CPAP??
Yes.
http://www.cpapman.com/batterygeek.htmlIntroducing the Battery Geek BG C150 & Battery Geek BG C222 Professional CPAP Battery System
Designed specifically for most popular CPAP machines, the Battery Geek BG C150 battery backup system allows people with Sleep Apnea to rest easy anywhere in the world. Stop searching for an AC wall outlet and rearranging the hotel furniture to position the bed within reach of a wall plug. Battery Geek's newest external power solution opens up a world of travel possibilities.
If it's rated for medical equipment, as the website says, it'll be safe to use.