To me it looked like they just pulled wires out to deactivate it. I'll gpo back and watch for a battery. but at this point, how long has the apocalypse been going on. I would think that battery couldnt last that long, and it would have had to have been a new battery installed right before. I usually am not such a stickler, but that one just bothered me for some reason. And the housing for the battery and internal mechanisms wasn't big enough to keep a battery that size. Other than that, I really loved the episode!