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The DC Battery Adapter Cable, when connected to either the DC Interface Module or the Shielded DC Cord (not included), enables Respironics CPAP systems to operate from a 12 volt DC, marine-type battery with alligator clip connections.
When connecting your CPAP machine to a free-standing 12-volt battery, there are 2 required cables:
This battery adapter clamps directly to the freestanding battery's positive and negative terminals. The other end of this cable connects to a DC Shielded Power Cord which then connects directly to the CPAP machine.