battery for old iPod

So, I have now repaired the screen on this old iPod, only to find out the battery is useless. It's a black and white 30 GB classic. Does anyone have recommendations for companies that replace batteries in old iPods? I see that the batteries don't cost too much, but I'm not familiar with companies that can do this repair, which didn't look easy.

Thanks for your help.

via ehMac.ca http://ift.tt/1lOumNi