How to Replace the Battery in an iPod or iPod Classic (5th, 6th and 7th Gen) - YouTube
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Apple iPod Classic 5th Gen. 30GB - White (MA002LL/A) Works Great 885909051878 | eBay
Amazon.com: KOKKIA i10s (Black) Tiny Bluetooth iPod Transmitter for iPod/iPhone/iPad with Authentication. Remote controls and local iPod/iPhone/iPad volume control capabilities. Plug and Play. Works with AirPods. : Electronics
You can upgrade an Apple iPod Classic with an M.2 SSD fit for a PC | PC Gamer
Apple iPod 60 GB Black (5th Generation) (Discontinued by Manufacturer)