How to charge a g shock

I couldn't find your model on thier web site but this range appears to have solar panels to charge the battery. Place your watch in bright sunlight or under a lamp (not a hot one) to charge the battery.

If this fails, consult your nearst dealer.

Chances are your atomic Casio needs to be charged, the battery that is. Simply wear the watch outside in the sunlight.

The charging battery sounds like it needs to be changed and the watch tested, I suggest a watch repair facility.

That means charge it. I.e. expose it to sunlight

http://www.casiosalesandservice.com/repair.htm

Press Adjust / Hit Mode until the minutes or hours is flashing. either one will do. When on or the other is flashing press the "G" button for the light. This becomes the switch for 24hr/12hr.

it means the battery is going dead.

if this is the same as my watch, it's solar powered and when it gets TOO LOW< it will blank out and begin to charge .  Stick it in direct sunlight for a day if you can.  You can also stick it under a regualr lamp, but it will never get fully charged, but it should be enough to operate at least.  The battery meter is the top middle dial on the face.

Press Adjust and hold until blinking city appears.
Press Mode until DST appears flashing.
Press Recieve until mode that you want appears ON OFF AUTO
Press Adjust until not blinking city code.

Go to this link; http://world.casio.com/wat/download/en/manual/ and enter the four digit code on the back of the watch, you should get a user manual - i do think you are probably right however. Hope this helps :)