– The 1st prototype had a 9V battery and computer power supply.
– The 2nd proto was working with li-po batteries
– The actual proto works with rechargeable LR6 batteries (1,2 each). There is 10 batteries split in 2 power supply of 6,2V each (5 batteries each). One for the +, one for the -. This voltage is then filtered at 5v in order to power the arduino board, sensors and actuators.
http://www.liberatingtech.com/ (sell many internal batteries compatible with multiple systems)
http://www.i-biomed.com/ (sell flat, flexible batteries)