According to page 31 in your owner's manual, the USB power jack requires 5v DC at 1000mA. So a USB cube meeting that spec with a USB mini connector on the scanner end of the cable would work.
You can run the Home Patrol on any of these: 1) NiMH rechargeable batteries, 2) ordinary non-rechargeable batteries, or 3) no batteries, if the plug-in power source happens to be attached.