DaveNetMan , swelling are generally signs of a damaged battery.
When charging takes place, chemical reaction occurs within the battery itself and gases are produced. Most well-made lithium packs have vent holes to allow these gases to escape safely. Some don't have them, or just simply poorly made.
Without the presence of good vent holes, the batteries tend to swell when charging.
It shouldn't harm your player, unless some of the chemical liquid actually leaks into the player itself, or the swelling is so great that it bends and damages the player circuit board. Do discard the swelled battery properly as it shouldn't be used anymore.
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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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