Kingstons Kingston's s media player, the K-PEX is a rebranded Korean player called the Cenix GMP-M6. Here are some scans:

• This is the rear/back side of the Kingston K-Pex, The upper red and black cabels are for the speaker the two at the bottom is for the battery.: battery.
  
  

• This is the front side of the Kingston K-Pex.:
  
  

The battery says:

+ -

383553
850mAh/3, 7V
SGS Certified
Made In China


The Bios (.rom) of the mp3 player can be downloaded in self extracting .exe files from this site:
http://www.kingston.com/support/downloads/portablemedia/default.asp?s=k100a

The battery says:

+             -

383553
850mAh/3, 7V
SGS Certified
Made In China

The Bios (.rom) of the mp3 player can be downloaded in self extracting .exe files from this site: http://www.kingston.com/support/PORTABLEMEDIAPLAYER/Firmware.asp

There is a forum dedicated to hacking the firmware of this device here: http://my.opera.com/community/forums/forum.dml?id=5116&days=999&z=1.