Fuji e550

This sounds like there is an internal short which is draining the batteries as soon as you put them in. Were the cameras taken in from the cold to a warm room? that will cause internal condensation which can fry the interior. Clean out the battery compartment completely, be sure no metal is floating around in there, and be sure that you have the polarity of the batteries correct. If that doesn't help, send the camera back to Fuji if in warranty.