When things don't go right...

• A flashing red the back lamp of the camera (error) may indicate that the temperature of the battery or of 
  the area where you are trying to charge is outside the allowable range (10°C to 35°C). If this happens, 
  unplug  the USB cable from the camera and wait for a while until the camera is within the temperature 
  range of 10°C to 35°C  (50°F to 95°F), and  then try charging again.

• A battery that has not been used for a long time, certain types of computers, and connection conditions 
  can cause charging to take longer than normal. If charging takes longer than about six hours, a safety 
  timer will terminate it automatically, even if the battery is not fully charged. If the battery has not  been 
  used for a very long time, charging may terminate automatically after only about 45 minutes.

1) Using a battery that has not been used for a long time.
    Disconnect and then reconnect the USB cable to resume charging.
2) Insufficient power supply when connected to computer.
    Connect directly to a USB port what supplies a current of 500mA.

For details about the power supply capacity of computer's USB port, contact the manufacture of the computer.
Though disconnecting and then reconnecting the USB cable will resume charging, you may need to do so repeatedly if the power supply capacity of the computer is low.

* If charging fails or the back lamp of the camera continues to flash red after you take the steps described
   above, it could mean that the battery is defective.Contact your local Authorized Service Centers of 
  CASIO or CASIO Service Centers.