How to Replace iPod Classic Battery HD (A1099,A1059,A1136,4th Gen) - YouTube
How to Replace the Battery in an iPod or iPod Classic (5th, 6th and 7th Gen) - YouTube
3000mah 'Thin Model' Extended Capacity Battery for Apple iPod Classic – Elite Obsolete Electronics
iPod classic 160gb modded to 256gb with 2000mah battery and Bluetooth. Just waiting on a 3d printed back. All fits within a thin shell. Very happy with how it's come up. :
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Apple iPod Video (60/80GB)/Classic (120/160GB) 5th/6th Generation. High capacity 700 mAh Li-ion battery
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