DC power chord

Hello - I'm new here- so I apologize if this is a repeat question, or a no-brain-er but we'll find out... I am working on an art project in which I want to run 2 old 16mm projectors from a [one] car battery. Both of the projectors have a dial/switch on them which can be turned from A.C ("60 cycle 115 volt") to (DC -or- AC 25 cycle)... [The way it is labeled is unclear but I cant imagine the "110 volt" applies to the DC option as well] Other relevant info listed on the projectors: First one is listed as "AC 115volt -OR- DC 9amp" Second one lacks that clarification and states "115volt / 8amp" I've consulted an "electrical specialist" at Lowes who seemed to think that I could cut off the ends of my power chords ["10A, 250 V - 15A, 125V"] and attach alligator clips to connect to the 12V battery.