Had to pry out the battery yesterday. Then could not get it back in. I fiddled and fiddled . Finally had to lay on my back and found that a screw on the right side of the lock had worked loose and was the problem. It took a year of getting progressively worse and worse. Towards the end I had to slam the battery in with my palm. Don't have a clue how the screw could have continued out. Just a thought. If it happened to me, it has happened to others.