Battery fully charged. but canon powershot sd600
Your problem may be due to worn out batteries or corrosion on the battery contacts inside the camera
which can prevent the full power of the batteries from flowing into the
camera. Try this free fix before you do anything else: remove the batteries and wipe the camera contacts firmly with
a dry cloth (heavy corrosion may require cleaning with a wire brush,
steel wool, or sandpaper). Remove any residue that may have fallen
into the battery compartment during cleaning, then wipe both ends of
the batteries and place them back in the camera. This cleaning clears
the problem about 90% of the time. If it doesn't work for you, chances
are that your batteries need to be replaced because they're just too worn to properly power the camera.
And then, of course, there's the possibility that your camera may have
a problem that requires professional repair.