I have several Logan actually and there is a specific version,the 17500 model that will accept all sizes of cells with the adapter kit and it works well at that role. One thing that I never consider or worry about is accidentally activating,they are pretty tight to turn and have little play in the bezel in my experience too. In fact it can be tough to use them one handed because of it. The Peak use a material between the battery and negative contact in the tube that when compressed varies the voltage allowed to the LED and thus dims the light. So in general the harder the light is tightened the brighter it will get. This is not a linear or even predictable thing though and in every PEAK that I have works differently if at all and it renders these lights finicky to many including to me! When one works it is pretty amazing but when it starts acting up it is frustrating for me and it is a hard light to really depend on for dependable and repeatable performance,in my experience.