Anyone have trouble with these? I bought two, the first one went in fine and is working great. The second, I tried to put in the camera and it was a very tight fit, and the cam would not turn on. I was in the field and luckily had AA batteries on me so put that cam back out with those. I returned that battery pack thinking it was bad but when I got the new one, I tried putting it in a third cam at my house and same thing, very tight fit and cam would not turn on. 1 out of 3 worked