1900mAh Large Battery U2 Metal Thick Back Case for iPod 7th gen Classic 160GB | eBay
512GB Back Housing Case 1900mAh Battery for iPod 6th 7th Classic SSD Upgrade | eBay
iPod Video High Capacity Replacement 3000mAh Battery 5th/5.5 Generation 5G
Upgrade Big 1900mAh Battery Replacement for iPod 5th Video 6th 7th Classic 80GB 120GB 160GB HD to SD TF SSD iFlash Upgrade|AC/DC Adapters| - AliExpress
256GB Back Housing Case 1900mAh Big Battery for iPod 6th Classic SSD Upgrade | eBay
Finished upgrade of 7.5 gen iPod Classic (See Pics) UPDATED 01.24.15 | Page 2 | MacRumors Forums