This battery cable adapter is to be used with the ResMed 12-Volt DC Power Cord for S8 Machines. 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 for S8 Machines. It will not work without this additional piece.