Hi Rockbox users

I got an iPod 3rd generation with 15 GB HDD through internet auction. I
bought it specially for using the Rockbox firmware (at the moment
original firmware version 2.3 installed).

What replacement battery do you recommend me? With Google I found only
replacement batteries from Sonnettech. They cost about 30$.

Can I do it myself? Its better to send the iPod to Apple Support or any
other partner?

cheers
Simon