I have the Pre A II which takes 12v. I have an after market adapter which puts tons of hf noise into the signal. I don't want to drop the bucks on the OEM unit, and hate having another thing to plug into the wall anyway, so I'm thinking battery. The unit draws about 50mA, so I could make up a little box with 8 AAA's or 10 AAA NiMh's, which is what I guess I'll do, but I thought someone here might know of an option I haven't thought of. Fdeck, you out there?