Joffa,
I haven't seen a firwmare update that will fix issues with the battery so I wouldn't recommend you update the firmware unless you know for SURE that it's compatible with your player, otherwise you will risk killing it.
Some questions for you:
1 How long is the battery lasting you? 1-2 hours?
2. Do you play just music? Or video or both? Obvisouly video playback will suck more juice from your battery so won't last as long.
3. How long did you charge it for?
4. Do you charge it with the wall charger or through your computer?
I have a number of different MP4 players from different manufacturers. The player will lost me about 4-6 hrs music playback. I haven't tested it on video though.
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