I was a little surprised at how exposed the electronics were, when you access the battery. The tip of the mechanical key can serve as a screwdriver blade to pry open the case, in a pinch.
Try reading your owner's manual? One detail they overlook: When you pry the halves of the case apart, the electronics tend to stick to the wrong half of the case. I solved that with baby powder to keep it from sticking the next time.
