Hi PLMONROE,
Besides the +15V and -15V dc, I'm sure that there are quite a few other voltages used by the DEQX (perhaps 5V, 3.3V, 2.5V, and others). I'm not saying it cannot be modified for battery power, but it would take some time to figure out the requirements (voltages, current draw, etc.).
Unfortunately, *time* is one of those things I wish I had more of these days

Best regards,
Vinnie