I'd agree with a lot of what has been said here.
Step 1: make sure the internal jumper switches haven't been set to 12v operation, which might be the case regardless of the tag on back. The V2 manual can be found here:
http://taperssection.com/index.php?topic=37956.0Step 2: Get a digital multimeter (can get one from Radioshack for about $25) and be sure that your battery hooked up through your battery cable gives you the proper voltage (should be gnd on pin 1, +V on pin 3 or 4, iirc)
If the V2 is set to 6v operation and you're getting 6V (or 9V from the DVD battery) through your battery cable to the proper pins on the XLR end of the battery cable, then if it still isn't working when you have made sure it is getting the proper voltage....
Step 3: Return it back to the seller or send it off to Grace