Why fix it? My iPod Classic (thin) was in constant use in our 2010 Honda CR-V with a USB connection and fingertip controls on the steering wheel. Then it stopped working, and I concluded the battery had died. SiriusXM wanted big bucks/month and all I wanted was music. I was confident the factory price for battery replacement would be outrageous, so I looked at ifixit's solution. No way was I going to pay the XM price. Made my decision and never looked back.
It wasn't simple. I could NOT open it with the plastic tools. So I used the thick end of the metal spudger to start the opening, then twisted for room to insert the plastic tool. Then repeat. The putty knife procedure helped. I had difficulty understanding which way the 90% clamp worked on the tiny cables. As a 77-year old, my eyes were not the greatest! but I finally figured it out without any damage. Whew! Ended up with no scratches on the outside, but was unable to get the top & bottom to close perfectly. There are definitely very tiny gaps on both sides, but I can live with them...easily.
Use the metal spudger (carefully) to create the gap necessary to accept the plastic tool. Then follow the pictures and instructions. And remember if an old man, not particularly handy with his hands, can get this job done...SO CAN YOU!!!!
iPod Classic (Thin) Replacement Battery
1.5" Thin Putty Knife