I have an older Black Diamond headlamp that I like a lot. I have a newer one that I don't like as much. The new has a smaller (more sensitive) button. On several occasions it has accidentally activate in my pack. Then when I role in to camp half my battery life is gone. The new one dims where the old one just turned on/off. This issue seems associated with that. My new one is a couple years old, so it is possible BD has corrected this issue.