This is a basic guide on how to access the flash battery should you need to...
How to disassemble the DSC-WX100 in order to replace the LCD screen.
How to replace an exhausted or damaged battery.
How to get to the image sensor in the DSC-WX100.
Removing the outer casing of the DSC-WX100.
Removing the lens from the DSC-WX100.
Replacing the flash bulb on the DSC-WX100.