This battery cable adapter is to be used with the ResMed 12-Volt DC Power Cord. This product will adapt your DC power cord to allow for a direct connection from your ResMed S8 CPAP machine to a 12-volt, 100AH, deep cycle marine battery. Great if you do not have a working cigarette lighter power source or would like to keep an emergency back-up power source for your home.

Please note: This product must be used in conjunction with the ResMed 12-Volt DC Power Cord. It will not work without this additional piece. For use with the S8 and S8II Series ResMed machines. It will not work with the S9 series ResMed machines.