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Från PDASmart.com
iPod 850mAh Upgraded Battery - 3rd Gen - Finally, more battery life for your new 3rd Generation iPod! The 3rd Generation iPod (with the sync port on bottom rather than the firewire port on the top) comes with a 630mAh internal battery and our new replacement internal battery offers you almost a 35% increase over the capacity of the original!
The Do-It-Yourself kit comes complete with very detailed instructions and all the right tools to do the job without damaging your iPod (please don't pry open that case with a flat-tipped screwdriver!). We had this battery developed with the same lithium-ion polymer battery technology as the original and it is rated at 3.7 volts and 850mAh.
<EDIT> Glömde skriva att de tar $55 för gör det självkittet inkl verktyg