HI
Try E Bay!! I got one a while ago for my my first gen Nano Knockff. I intended to swap it with the crap one that came with it!! BUT!! I fryed my first gen clone and did not do it in the end!! Need a FW 9.0.48 for that one now!! :cry:
The battery is apparantly a genuine replacement for ipod Nano,e it is 3.7V and runs at 400mAh.The dimensions are apparantly the same as that would fit these first gen nano clones, down to a mm or so, tight fit by all accounts. Check out the other messages on here people have already done the swap.
The battery cost including postage was about $15 or less!! I have never ended up using mine.
I then got a new 2nd Gen Nano Clone in the new metalic style, and discovered the battery is even more of a piece of crap, than the first gen. I tried to figure a way to get the insides out to do some surgery on it also, but gave up due to the fear of breaking it!!. The first gen was a lot easier to take apart!! After a couple of months my 2nd gen has almost given up, regards battery life!! And dont want to try the surgery so I went out on the weekend and paid $299 for a 4GB genuine 2nd Gen Nano!!

ops: 4 days in and I have not even recharged the battery!! :shock: :P YES iTunes SUX!!!! :evil: But have discovered a whole culture out there that is dedicated to hacking and modding the ipod regards itunes and DRM!! :P
So I dont use itunes anymore
I am happy to sell that battery if ya are interested!! It's unopened!! PM me!! I ca email pix.
Im in Adelaide SA.
Cheers
Joffa