Since most of my applications for my XD-V75L kit involves on location dialog recording for TV production I needed a battery option. I decided to design a battery kit that uses lithium ion power tool batteries. (Makita BL-1830) The batteries are 18 volts nominal. They operate over a range from 20 volts max down to about 11 volts min. I have designed a battery sled with an internal switching regulator that provides a stable 9 VDC to the XD-V75 receiver. The Battery system works great. It can run the receiver for about 10-12 hours and the batteries recharge in 25 minutes. They are also exceptionally rugged and inexpensive. You can find them at any hardware store too.
I did discover something interesting about the XD-V75 receiver. When the switch on the front panel is OFF... It still draws about 111ma. When operating the receiver draws about 225ma. But when you switch it off... It does not really turn off. It goes into a low power mode that still uses a considerable 111ma. I believe this mode is actually part of the firmware bootloader process still running on standby. So if you plan to run an XD-V75 receiver on a battery you need to make sure you provide separate power switch for the battery to prevent it from being killed completely.
111ma may not seem like much... But at 9 volts that's almost a full watt. So... a rack full of 12 receivers will still draw 12 watts from the wall when the front panel switches are turned off. Interesting.