Tell us about yourself!
You are wrong. The ODROID XU4 can use up to 6A 5V, if used with usb devices that use a lot of power. I would prefer a 12v battery and a DC-DC converter that outputs 6a 5v of power from the 12v battery.
XU4 has 4 2.0ghz cores and 4 1.4ghz cores, 2gb ram and pretty much better at processing power.
The xu4? its much better than the c2.