Hi,
As for the battery, normal MP4 Player batterys normally can hold a charge for about 4hrs if just playing MP3's at a normal volume level, any other features used (movie, fm etc) reduces the length of the charge.
If your player only lasts less than the normal 4hrs before it needs to recharge, then you probably have a bad battery, a bad battery can't be fixed via firmware. You may want to get it exchanged if the battery is really bad.
You can look for a USB wall charger, they don't cost that much. Not sure about extra batterys and stuff.
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