its possible.. just hook your batteries directly to the Cbox if they are the right voltage..
But it takes a really low voltage to make the system drop..below 3.5 volts..
Make sure each tx module is bound to the correct receiver after messing with the student thing.. its because the wireless mode defaults back to the default mode after power off from using teacher/student.. I suspect that could be the issue.. but I don't know .
Sorry for your loss.. this thing has been bullet proof thus far for us.. We went through the over 1400 pilots flying at Joe Nall with no issues...
Keep looking!!..goose