I just noticed something really weird with my princeton tec attitude. Today when I turned it on it seemed like it was much dimmer than when I first bought the light. I haven't used it in a while so its hard to tell. I have been using the 4 batteries that came with it. I checked the volatge on them and 3 say 1.35 volts and another doesnt even register. shouldn't they all be drained equally? is it possible i got a dud battery?