Relikk , actually those on ebay are all about the same. You'll need to open your player and measure the max allowable space for the battery (length x width x thickness). Then find a battery with the same or lesser dimensions, which some sellers lists them in the ad. Typically the ipod shuffle and nano battery would fit.
A higher mAh rating would be better, gives longer playtime.
Regarding the charging issue, it depends on what you use to charge your player. The typical AC adaptor charges at 1A or 1C, whilst USB charges it at 100mA or 0.1C.
So if your battery rating is 250mAh, which means it can deliver full 250mA in 1 hour. The player would be fully charged (from a "flat" battery) in 2.5hours using USB, or 15mins using AC adaptor.
So when over-charging is concerned, it just means not exceeding the 2.5hrs or 15mins by too much.
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Why are clones called MP4 Players, when they don`t play .MP4 at all?
It`s like an MP3 Player which plays Music CDs only.
T39 doesn''t sound as good as my T29
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