How to Replace the Battery in an iPod or iPod Classic (5th, 6th and 7th Gen) - YouTube
Replacement Battery For iPod Classic Video Thin 5th 5.5 30GB 6th 80GB 120GB 7th 160GB 616-0229 Battery 616-0232 Batteries
Amazon.com: Battery Replacement for iPod Classic 6th GEN A1238 (80GB) - Compatible with iPod Battery (450mAh 3.7V Lithium Polymer) : Electronics
iPod Video 60/80 GB Battery
iPod Classic 6th GEN MB147 80G Battery - Apple iPod Classic 6th GEN MB147 80G Battery - Spare Module Type Apple iPod Classic 6th GEN MB147 80G Replacement Lithium Polymer (Li-Polymer) Media