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. :
My modded Classic 7th gen. 2000mAh battery, new housing, 128GB SSD, custom 128GB thin back and taptic engine mod! Everything fits so nicely. : r/ipod
2000mAh Battery for the iPod Classic & Classic Connect – moonlit.market
Apple iPod Classic 7th Gen 256GB Flash Modded & 2000mAh Battery Silver – iFurb Australia