michiganjfrog , in general the cheap replacement batteries don't have much IC protection within it. Even those that do, i guess it would pretty much be at the very minimal.
The Japanese cells you mentioned might be of the higher quality, and probably contains better IC protection to cut the charging current off when full.
It is possible to use brand-name lithium chargers, but not very practical in these players. They don't come cheap, around the range of $70-$150. And you will need to remove the battery to slot into the charger itself, just like charging AA/AAA in wall socket chargers. As these chargers uses temperature sensors in addition to voltage sensors to sense the capacity state of the battery.
But normal charge via AC or USB with the cheap batteries would be fine. Just keep the overcharge time as minimum as possible, and you'll avoid the battery swelling.
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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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