I've had my Opteka Battery Grip for the Rebel XT for about half a year now. Recently, I've noticed that "sometimes" I will go to the camera and the batteries will be wiped out. I've tried re-seating the grip, removing the batteries and re-installing and removing the grip and trying the batteries with just the camera to see if was not the batteries. Has anyone else had experience with significant battery drain? Have we come to any conclusions on whether one must turn the grip switch off to preserve the batteries?
