Square Repair LTD - This iPod Classic had a swollen battery which can be seen on pushing on the LCD. The swollen iPod battery meant the iPod would shut down randomly and
How to Replace the Battery in an iPod or iPod Classic (5th, 6th and 7th Gen) - YouTube
NewerTech 540mAh NuPower Battery for Apple iPod 5th Gen & Classic
100pcs /lot 650mah 3.7v Battery For Ipod Classic Gen 6th 7th 80gb 120gb Thin 160gb For Ipod 5/5.5 Gen Video 30gb 616-0229 - Mobile Phone Batteries - AliExpress
Amazon.com: Replacement Battery for Apple iPod Classic 120GB, iPod Classic 6th GEN A1238 80G, iPod Classic 6th GEN MB029 80G, iPod Classic 6th GEN MB029C/A, iPod Classic 6th GEN MB029J/A : Electronics