Thanks... so it can use (2) 3.6v batteries? I tried making some of those disks, actually, I have some more drying right now. The first batch didn't work. When I installed a disk, it did reduce the volts a little, according to my voltage meter through the silver bullet. But when I stuck on an atty, didn't seem like any current was coming through at all. Checked it again, and same thing. Weird! I can't figure it out!