I have a Casio Shock Risist watch (GW-500A) that says "charge" on the display, that is all it shows. Does it need a new battery or what?

From the main time display, hold down the adjust button until it beeps and your time zone is flashing on the bottom of the display. Then press the mode button once. [AUTO/ON/OFF] DST will be flashing on the bottom. Use the Time Memo and/or Receive buttons to cycle the mode. When it's what you want, press adjust twice.

The rechargeable batteries last one to three years and must be replaced, cost depends on make and model, so I can't give you a price, but should be easy to find out from the jewelers.

From your description the solar cell charges the battery and keeps it topped up. I think the rechargeable battery is the problem because when the screen goes blank the battery level drops to low and the LCD blanks out which would explain the intermittent operation of the watch. I think it is worth getting it checked out with an estimate.

The rechargeable battery needs to be replaced in the watch, you need to take it to a jeweler to have a new one installed.

You have to reset this watch after battery replacement. Using tweezers or something similar you have to touch the AC & - contact on back of watch, for 2 seconds. Hope this helps.

http://www.casiosalesandservice.com/istar.asp?a=3&dept=PARTS

mcdevito75 here, Possibly the battery is worn out. An old battery will not hold a charge, Visit a small watch repair shop in yourarea for a new battery.

Check out this YouTube video which walks you through the battery change process:

http://www.youtube.com/watch?v=ogCz2vjUKVg

if there is a black screen and shows chg thats mean your battery level is to low ////// so you must charge as soon a possible,,,,,,