Hey!
My NOS DAC run on two 12V 7AH batteries with 30,00uf caps between the line. And this work fine.

I'm not sure about your DAC but first make sure that the run on 12DC and not AC. I know is silly but you can't be too careful. If the wall wart adapter is a simple looking one than maybe the regulator is inside the DAC of which is likely. And if it really drawn near 1.5A than I'm not sure how long can you run it with 7.2AH batt.
So, with that I think it should work fine with batt.
BTW... I like my DAC running from batts than wall the cheap 2A wall adapter.

But! Since I don't know any thing about your DAC please take my comment with precaution and try it at your own risk!

Take care,
Buddy
