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303450 3.8V 600mAh polymer lithium ion / Li-ion battery for dvr GPS mp3 mp4 - AliExpress
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Original Sony Ericsson Jalou F100 Flip Cellphone 3G FM Radio MP3 Phone | eBay
New 3.8V 4500mAh Battery For FIIO M11 HIFI Music MP3 Player Speaker
Do Vintage MP3 players count? Here's my Iomega HipZip finally working thanks to its new battery! : r/retrobattlestations
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