this battery provides 12+5V and is small as a pack of cigarettes. $23 on ebay
http://cgi.ebay.com/12V-DC-USB-5V-R...270?pt=LH_DefaultDomain_0&hash=item3a5d27eace
i use it for my asus wicast on a 550D (can provide the 5V to emitter, hdmi splitter and 12V to lcd monitor)
same battery for receiver and lcd monitor at the endpoint.
http://cgi.ebay.com/12V-DC-USB-5V-R...270?pt=LH_DefaultDomain_0&hash=item3a5d27eace
i use it for my asus wicast on a 550D (can provide the 5V to emitter, hdmi splitter and 12V to lcd monitor)
same battery for receiver and lcd monitor at the endpoint.