ac power

When using AC adapter to PC - is the unit using my batteries or AC power? Hi there. I tried to research this a bit beforehand but came up short. Does anyone know if I'm plugged into a power source with my USB ac adapter, but still have batteries in the scanner; is it running off of the AC...

Does anybody know what voltage the AC power adaptor supplies...??? I have an old MX3000, but the manual doesn't say and I have several AC wallwarts...

The RS 404 says min 400 milliamp and 9v. So, I got the 9v 800. Then, the young RS employee who wasn't even sure what I was talking about at first fitted a "C" plug to the wall wart. It fits fine, but not super snug. First, is RS's type C the right one? Second, the polarity being correct, I get...