Four of those 1/2C batteries would be ok in width but only 4" in height and I need 4 3/4" maybe 5. Four would put the voltage at 4.8v for each side but five would put the voltage at 6v, too high I think. Also am wondering if 4.85v is for total of both sides of the controller battery departments or just for each side which I think it is? The controller needs battery packs one for each side. Check out the old Stereophile review, it is still online. Just google Proceed CD Library. Not sure and hard to get info on this. My best bet would be to find someone with one of these units somewhere and do it right. I cannot be the only one in the world with this unit, can I?