I was wondering the same thing myself, I know this is old but I wanted to provide a more complete answer.
Of my understanding the batteries are the same, the difference is the board connected to the battery and the solder points to the logic board. The 4th Gen solder points are very close together and the 5th Gen are spaced apart quite a bit more.
So the simple answer is no, but it could be possible to change the actual batteries and keep the correct PCB board with the iPod.
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