ive read alot of this stuff about 4x aa batteries and from what i gather its not going to power for very long - im busy in work but just come accross this VERY interesting article, now im an absolute beginner (learning fast) BUT this guy''s onto something im sure -
copy'd and pasted the bit that caught my attention for you guys....
"I initially started by powering it externally, so then I tried the device shown on the left. It’s the guts of an iPhone car charger, which converts 12v to 5v, so I tried to see what it would put out if connected to 4xAA batteries, which is the end goal for power,as I want to be able to swap batteries during a shoot. Unfortunately, the DC-DC converter drops a volt from the 5.25v set of batteries I tried, giving me 4.25v. Not enough for the Pi. Putting it on a 12V supply gave me a nice 5.02v, but it’s more difficult to source a 12v battery that’s small enough for my purposes.
However, I then spotted the parts lying on my workbench, and as I sat there looking at the parts I’d already taken out of the battery grip, I realised it might be possible to use some of them to make a compartment for a Canon 5D Battery, which runs at 7.2 volts. A quick test with one of those batteries showed the output of the DC-DC converter at a steady 5.02 volts, so I then attempted to boot the Raspberry Pi. And up it came. I measured the current at 450-480ma, with a Microsoft wireless keyboard/mouse USB adapter in the USB port. I could ssh in, so the network port was fine with that PSU"
now doesn't that mean we could do a similar thing?!!!!!!!!!!!!!