Testing the largest iPod battery, 3000mAh! - YouTube
Found this really clean 5.5 gen at the thrift store for 20 bucks. The hard drive only had about 100 hours use time with no pending sectors or reallocations and battery seems
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New" iPod classic 7th Gen 128GB SSD Special Edition U2 2000 mAh Battery 885909237036 | eBay
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Amazon.com: i.Sound 2-in-1 Charger and Back Up Battery for iPod Touch and iPhone (Black) : Everything Else
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Bad batteries: Apple forced to recall 1st gen iPod nano in South Korea | TechCrunch