Thank you. Yes the power is powering the Raspberry Pi from the battery pack. It powers for 2.5 hours on 6 x AA 2400mAh Ni-MH rechargeable batteries.
The project is currently on hold until the Model A comes out, to reduce any rework. I have a switch mode regulator rather than the 7805 regulator. This is supposed to make a significant difference to power consumption, the 7805 is apparently about 55% efficient, the switch mode is apparently about 95% efficient. With the Model A drawing less current too, I am expecting significantly longer battery life.