Respironics
One Respironics 12Volt DC Battery Adapter Cable
This adapter fits over the cigarette lighter plug on the DC power cords and ends in alligator clips. The Battery Adapter requires a DC power cord, which is also included for you to have the ability to run your CPAP directly off a 12-Volt battery.
The Respironics battery adapter cable allows you to create a 12V outlet from a free-standing 12V battery in order to run your CPAP machine using a 12V cord (sold separately).
The battery adapter cable, with its red and black clamps which hook directly to battery terminals, provides a 12V outlet. One end of a 12V cord, or cigarette lighter cord, can be plugged into the 12V outlet of the battery adapter cable while the other end is plugged into the 12V DC input port on the CPAP machine.
You can use any 12V battery with exposed battery terminals. Good choices are car batteries and deep cycle marine batteries. The 12V cord can be plugged into any 12V outlet such as that found in a car, boat, or RV.