Hey guys, I have an old 30gb iPod classic and I need a new battery pack as my belkin one seems to have broken. It used 4 AA batteries and I was quite happy with it (although it was a bit big, but it lasted quite a while). I'm looking for something cheapish, maybe something that can be bought on dealextreme for example. Does anyone have any suggestions? Should I get 1 with replaceable batteries or 1 that can be charged? I primarily need for for long haul flights (30 hour travel journeys). Thanks!