ipod batteries could work, the thinner the better. try to get one built for maybe a nano, since they are the thinnest one. it looks like a ds battery way be too thick for your device, but for mp3/4/5's you definitely want 3.7v. go as high as you can with mah's, because the more the merrier, the more mah's, the longer it will stay charged. you should brobably try a thin one from something like a ipod or the sort, you will probably want something that is at least 800mah for this player.
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